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GT500 - which gears?


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#31 OFFLINE   svt2010

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Posted 02 June 2012 - 04:52 AM

Does anyone make a 3.90 gear for the 8.8 rear in out cars?

#32 OFFLINE   Albino500

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Posted 02 June 2012 - 08:22 AM

Does anyone make a 3.90 gear for the 8.8 rear in out cars?

Yes
2007 GT500 Built on 7/27/2006
#918 of a build of 8152 coupes
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#33 OFFLINE   2010KonaBlueGT

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Posted 02 June 2012 - 10:20 AM

I've got the feeling that's not the install kit I need. Is it? There's like 5 different install kits!


Ford Racing offers 3 levels of install kit. The one you cited is identical to the lowest end FRPP kit at the very same price. All it includes is the shims, pinion seal, crush sleeve and gasket.

Another includes bearings. I can't remember what the third one includes but if you follow the link to the Ford Racing gear, the 3 kits are listed near the bottom of the page.


Phill

2010 GT500 Coupe
Kona Blue w/White OTT Stripes and Red Accent Stripes
Electronics Package, HID's & Car Cover


CURRENT MODS: FRPP: Whipple 2.9L Polished Superchager w/Crusher Inlet & Cobra Jet Dual 65mm Throttle Body - Ceramic Coated Shorty Headers - Ford GT Blue Cam Covers - Polished Billet COP & Oil Filler Cap Covers - FR3 Handling Pack w/Tokico Struts/Shocks & Eibach Swaybars - Jounce Bumpers - 8.8" Low Profile Axle Girdle - 3" Front Brake Cooling Ducts - Vacuum/Boost Gauge~ MGW: Short Throw Shifter - White w/Blue Stripes Shifter Knob - Radiator and Intercooler Degas Bottle Caps - Seat Recliner Lever Covers - Parking Brake Handle Cover - Coat Hanger Hooks~ PST: 1-piece Carbon Fiber Driveshaft~ Revan Racing: C&R Radiator and Intercooler~ ROUSH: 3x Intercooler Degas Bottle - Side Splitters - Extreme Off-road Exhaust - Adjustable Trailing Arms (LCA) - Adjustable 3rd Link (UCA) - Adjustable 3rd Link Bracket - AC Vent Pod Vac/Boost Gauge Mount~ SHELBY: SC Aux. Idler Pulley - Oil Dipstick Handle, MC, PS & WS Washer Reservoir Caps - 8-qt. Oil Pan - Tubular K-Member Subframe - Tubular A-arms - CS S1000 Billet Aluminum Transmission Crossmember - Seat Harness Bar - 6S Extreme Rear Brakes - 6S Extreme Front Brakes - GT500KR Front Brake Cooling Duct Bezels - Anti Bump-stear Tie-rod Ends - Race Style Swaybar Links - Adjustable Caster/Camber Plates - Adjustable Panhard Bar - Panhard Bar/Body Brace - GT500KR Rear Axle Reservoir - Lower Control Arm Relocation Brackets -18" GT500KR Alcoa Dura-Bright Wheels & Goodyear GT500KR Winged Boot F1 Supercar Tires~ Raptor Shift Light

PURCHASED AND AWAITING INSTALLATION: Shelby/Metco Fuel Rails - Shelby Alcoa Forged 20" Dura-Bright Super Snake Style Wheels - Shelby Billet Aluminum Fuel Door - NMB2 2-Stage WOT Box - Granatelli Motors Tire Fryer Line-lock - ZEX N2O kit - Ford Racing Lighted Sill Plates w/Ford Racing logo.

 

Soon to be "For Sale": Eradispeed Rear Brake Rotors & Caliper Relocation Brackets


#34 OFFLINE   CodyWayne718

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Posted 02 June 2012 - 01:52 PM

So which one should I go with? Car has 18k miles on it. Thanks guys

#35 OFFLINE   2010KonaBlueGT

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Posted 02 June 2012 - 02:24 PM

So which one should I go with? Car has 18k miles on it. Thanks guys


I have a complete Snap-On puller set and bearing grips and caps to install so I can get away with using the basic kit without bearings. I can pull the bearings without destroying them, not sure if you can or not.

If you can pull the side/carrier bearings and the pinion bearing off without damage, you don't need bearings. Simple as that (well, unless your bearings are bad). If you can't, you do (need bearings). The Level 3 kit includes axle bearings so if you want to pull them and replace them, that'd be the kit for you. With only 18K miles on the car, your axle bearings should be fine.

SO....if you can pull the diff. bearings, get the 1st (L1) install kit. If you need diff. bearings, get the L2 kit. If you want or need axle bearings, L3 kit.


Phill

2010 GT500 Coupe
Kona Blue w/White OTT Stripes and Red Accent Stripes
Electronics Package, HID's & Car Cover


CURRENT MODS: FRPP: Whipple 2.9L Polished Superchager w/Crusher Inlet & Cobra Jet Dual 65mm Throttle Body - Ceramic Coated Shorty Headers - Ford GT Blue Cam Covers - Polished Billet COP & Oil Filler Cap Covers - FR3 Handling Pack w/Tokico Struts/Shocks & Eibach Swaybars - Jounce Bumpers - 8.8" Low Profile Axle Girdle - 3" Front Brake Cooling Ducts - Vacuum/Boost Gauge~ MGW: Short Throw Shifter - White w/Blue Stripes Shifter Knob - Radiator and Intercooler Degas Bottle Caps - Seat Recliner Lever Covers - Parking Brake Handle Cover - Coat Hanger Hooks~ PST: 1-piece Carbon Fiber Driveshaft~ Revan Racing: C&R Radiator and Intercooler~ ROUSH: 3x Intercooler Degas Bottle - Side Splitters - Extreme Off-road Exhaust - Adjustable Trailing Arms (LCA) - Adjustable 3rd Link (UCA) - Adjustable 3rd Link Bracket - AC Vent Pod Vac/Boost Gauge Mount~ SHELBY: SC Aux. Idler Pulley - Oil Dipstick Handle, MC, PS & WS Washer Reservoir Caps - 8-qt. Oil Pan - Tubular K-Member Subframe - Tubular A-arms - CS S1000 Billet Aluminum Transmission Crossmember - Seat Harness Bar - 6S Extreme Rear Brakes - 6S Extreme Front Brakes - GT500KR Front Brake Cooling Duct Bezels - Anti Bump-stear Tie-rod Ends - Race Style Swaybar Links - Adjustable Caster/Camber Plates - Adjustable Panhard Bar - Panhard Bar/Body Brace - GT500KR Rear Axle Reservoir - Lower Control Arm Relocation Brackets -18" GT500KR Alcoa Dura-Bright Wheels & Goodyear GT500KR Winged Boot F1 Supercar Tires~ Raptor Shift Light

PURCHASED AND AWAITING INSTALLATION: Shelby/Metco Fuel Rails - Shelby Alcoa Forged 20" Dura-Bright Super Snake Style Wheels - Shelby Billet Aluminum Fuel Door - NMB2 2-Stage WOT Box - Granatelli Motors Tire Fryer Line-lock - ZEX N2O kit - Ford Racing Lighted Sill Plates w/Ford Racing logo.

 

Soon to be "For Sale": Eradispeed Rear Brake Rotors & Caliper Relocation Brackets


#36 OFFLINE   Albino500

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Posted 02 June 2012 - 03:15 PM

I'll go with door (I mean kit) #2 Phill - :yahoo:- A WINNER !

Edited by Albino500, 02 June 2012 - 03:16 PM.

2007 GT500 Built on 7/27/2006
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#37 OFFLINE   corepuncher

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Posted 23 November 2012 - 12:59 PM

I have 3.73's, and they are NOT right for my car. I am looking to go MUCH lower.

I have a 2011 GT500 SVT. When it was bone stock, the gears were PERFECT! It would barely scratch the tires in 1st and going into 2nd.

However, now I have a TVS supercharger, and about 170 more hp and torque than stock. Not balanced any longer. In fact, I have to get to 3rd gear before I can safely go WOT in the power band.

Not only is wheel spin a problem, but just 1st gear in general, the engine is always racing and it seems I have to shift into second 2 seconds after I leave my driveway.

Therefore, I"m going to pick a rear end ratio that reduces wheel spin and increases gas mileage for daily driving.

My choices are 3.55, 3.31, 3.27, 3.15, 3.08. Which one is best?

I did some calculations.

First, compare to the 2013 which already comes with a TVS. Ford does a good job optimizing, so lets trust them:
Factor in a different 1st gear: Rear ratio X 1st gear = 8.8 for 2013.
My current setup = 11.08 for my 2011.
A 20.5% difference in torque. So what rear end ratio would I need to mimik the 2013 (get an 8.8?):
8.805/11.078 * 3.73 = 2.96.

Second, since I liked the way it behaved stock...lets compare the torque ratios and reduce 3.73 by that amount (no need to multiply by 1st gear ratio...they are the same):
Stock Torque: 510
My Dyno: 602

510/602 X 3.73 = 3.16. Ahh...that would suggest 3.15 rear end.

One last benchmark...I found an equation to estimate when tires will break loose at a given torque:
Using a typical 0.7 friction coefficient, I get 464 ft/lbs. Sticky tires with a 0.8 would yield 530 ft/lbs.
464/602 * 3.73 = 2.87
530/602 * 3.73 = 3.28

So using three different benchmarks:
Range: 2.87 to 3.28
Average of all 4: 3.07
I trust the 2 - real world measurements better than uncertain friction coefficient, so average of those two: 3.06

Now, the 3.08 would seem the winner using the averages. HOWEVER...this means if I ever get stickier tires, I have left acceleration on the table.

Therefore, I think the optimum choice would be the 3.15. It also happens to be same ratio of when my car was stock, and I LOVED how it accerated...only slight spin.

(3.73 - 3.15)/3.73 = 15.5 % decrease in overall RPM's across the spectrum. This should result in that same increase in gas mileage...as RPM's are basically proportional to gas usage (ignoring external factors).
That means a nice 2 mpg gain city, 3 mpg gain highway.

One last thing I have to consider...6th gear. All the other gears' shift points are effectively moved up...but the buck stops with 6th.

At 75 mph I currently am at about 1725 RPM. If I go with 3.15's, it will drop to 1457. That should still be fine for interstate...super OD!

I think this all makes sense, please let me know if you find an error, thanks. Now...time for shopping! Black Friday in effect.

Edited by corepuncher, 23 November 2012 - 01:11 PM.

2011 GT500 Shelby Mustang + SVTPP + NAV Delivered on: July 6th, 2011
Sterling Grey Metallic + Wide Black Matte Stripes
Mods (performance):Ford TVS + 2.59", CJ TB, C&R Heat Exchanger, 170 deg thermostat, Roush Tank, Resonator Eliminator, Airaid Blue Filter
20" Asanti 3-Piece forged rims with Michelin Pilot Super Sport Tires (255 F, 295 R)
Mods (dress up):Carroll Shelby Signature Plate, 20% Tint, Turn signal & Quarter marker light tint,
chrome door bezel, locks, handles, headlight knob, map lights, seat adjustment levers.

Stereo: JL C5-570x front doors, JL C2-570x rear, Jl Cleansweep + DX400 Amp, Memphis 1000D Amp + 12" Diamond Sub

#38 OFFLINE   HARLEYDEALER

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Posted 29 November 2012 - 04:33 AM

This link is very helpful, when choosing the right gear, I rather be a tat lower, then taller. But it's up to you and your driving style and how you want your car to react. Bill http://www.currieent...hCalculator.htm

#39 OFFLINE   Albino500

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Posted 29 November 2012 - 07:39 AM

corepuncher - JMO - tire diameter and coefficient of friction factor need be looked at more and one can only guess at driving style . My guess at this point would be to suggest a 3.27:1 rearend ratio to establish what you are after. Run the numbers and see what you think. Good luck and enjoy the ride.

Edited by Albino500, 29 November 2012 - 07:41 AM.

2007 GT500 Built on 7/27/2006
#918 of a build of 8152 coupes
#212 of 2252 in Performance White

Member of Terlingua Racing Team
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2007 SGT-California Edition Built on 5/15/2007
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1 of 89 Shelby GT-California Editions done in Performance White/Silver Stripes
Converted to " SCCA SMG Class " race car - 2/04/2013

#40 OFFLINE   corepuncher

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Posted 29 November 2012 - 08:06 AM

Thanks for your replies. I have ordered the 3.15 gears, along with a new girdle (hope it does not make me look fat)

Since my 1st gear is a 2.97, it really raps up fast. I decided to use the 2013 as a baseline since it has the same TVS as mine. 2013 has 2.66 1st gear.

One thing I did not take into account, the 2013 might have more torque than mine, since it's a 5.8 liter. Spec sheet says 631...my dyno said 602. At first I was thinking that is at the crank but actually I think torque numbers do NOT get reduced like HP does (from engine to wheels)? Can someone verify this?

If that is the case, I need to re-factor for the 2013 comparison.

So before, I got an equivalent 2.96 rear end. But multiplying by 631/602 = 3.10. So it appears the 3.15 I got is just right...a tiny bit shorter which is good.

Again, this is a daily driving car, so I'll never have slicks on it. And if I did, I'd have to get a new driveshaft anyway.

Now, I just need to find a place to install it. I would try myself but my friend said he had trouble with noise and such. Is there some tutorial that is very precise, would I need any special tools to get aligned properly, or do they just snap into place?
2011 GT500 Shelby Mustang + SVTPP + NAV Delivered on: July 6th, 2011
Sterling Grey Metallic + Wide Black Matte Stripes
Mods (performance):Ford TVS + 2.59", CJ TB, C&R Heat Exchanger, 170 deg thermostat, Roush Tank, Resonator Eliminator, Airaid Blue Filter
20" Asanti 3-Piece forged rims with Michelin Pilot Super Sport Tires (255 F, 295 R)
Mods (dress up):Carroll Shelby Signature Plate, 20% Tint, Turn signal & Quarter marker light tint,
chrome door bezel, locks, handles, headlight knob, map lights, seat adjustment levers.

Stereo: JL C5-570x front doors, JL C2-570x rear, Jl Cleansweep + DX400 Amp, Memphis 1000D Amp + 12" Diamond Sub

#41 OFFLINE   Secondo

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Posted 29 November 2012 - 09:39 AM

You'll need shims from the installation kit for the ring/pinion gear mesh spacing, a press to install the pinion bearing and a dial indicator to measure backlash. It can be done yourself but the parts are definitely not just bolt on & go. Best to find a reputable shop to do it.

Edited by Secondo, 29 November 2012 - 09:44 AM.


#42 OFFLINE   corepuncher

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Posted 29 November 2012 - 10:08 AM

Yeah, I'm gonna find someone to do it.

First random quote local place: 6 hr job = $520 ouch.
Ford: 5-6 hr job: 500-600 ouch.
Pinnacle Performance in Tulsa: 3-4 hour job $250.00. Ding ding ding!
I'll also have to take advantage of the super duper laser guided balancer :-)

Edited by corepuncher, 29 November 2012 - 11:06 AM.

2011 GT500 Shelby Mustang + SVTPP + NAV Delivered on: July 6th, 2011
Sterling Grey Metallic + Wide Black Matte Stripes
Mods (performance):Ford TVS + 2.59", CJ TB, C&R Heat Exchanger, 170 deg thermostat, Roush Tank, Resonator Eliminator, Airaid Blue Filter
20" Asanti 3-Piece forged rims with Michelin Pilot Super Sport Tires (255 F, 295 R)
Mods (dress up):Carroll Shelby Signature Plate, 20% Tint, Turn signal & Quarter marker light tint,
chrome door bezel, locks, handles, headlight knob, map lights, seat adjustment levers.

Stereo: JL C5-570x front doors, JL C2-570x rear, Jl Cleansweep + DX400 Amp, Memphis 1000D Amp + 12" Diamond Sub

#43 OFFLINE   Snoopy49

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Posted 29 November 2012 - 02:10 PM

Posted Image

2013 GT500 Coupe - HPW with Black Stripes - SVT PP - SVT TP - Redline Hood Struts - Yeager Bros Front Gravel Guards - Bob's Oil Separator -AirAid Blue Non-Oiled Air Filter - CarboTech 1521 Ceramic Brake Pads - Resonator Eliminator Kit - WeatherTech Floor Mats - Craig’s No Drill License Plate Bracket
Car Ordered 5-27-2012 - Build Date 1-14-2013 - Delivered 1-26-2013


#44 OFFLINE   corepuncher

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Posted 29 November 2012 - 03:48 PM

That is awesome! Do you have a spreadsheet or calculator for that? I still have 20"s but my tire is 295/35R20, only about 3 or 4 millimeters diff on height. They are the very largest tires I can put on with my rims without fender rubbing on dips.

Wow...so I'll be pushing 100 mph at the top of 2nd :-) Sweet! Perhaps a tad more slipping of the clutch to get going in 1st, but I'm going to immensely enjoy not having to shift out of 1st 2 seconds after I take off, and hopefully my tires will not spin like they are on ice. When you think about it, why not take out the human/clutch variable. Calculate the perfect gear so that all you have to do is floor it (depends on particular set of tires of course).

Edited by corepuncher, 29 November 2012 - 04:20 PM.

2011 GT500 Shelby Mustang + SVTPP + NAV Delivered on: July 6th, 2011
Sterling Grey Metallic + Wide Black Matte Stripes
Mods (performance):Ford TVS + 2.59", CJ TB, C&R Heat Exchanger, 170 deg thermostat, Roush Tank, Resonator Eliminator, Airaid Blue Filter
20" Asanti 3-Piece forged rims with Michelin Pilot Super Sport Tires (255 F, 295 R)
Mods (dress up):Carroll Shelby Signature Plate, 20% Tint, Turn signal & Quarter marker light tint,
chrome door bezel, locks, handles, headlight knob, map lights, seat adjustment levers.

Stereo: JL C5-570x front doors, JL C2-570x rear, Jl Cleansweep + DX400 Amp, Memphis 1000D Amp + 12" Diamond Sub

#45 OFFLINE   Snoopy49

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Posted 29 November 2012 - 05:43 PM

It is an Excel spreedsheet I made up for a friend. You will need Microsoft Excel or Open Office to use it. I tried to post it as an attachment, but was not allowed.
Here is a link to the file. It's great for playing what if.

Auto Formulas

Edited by Snoopy49, 29 November 2012 - 05:56 PM.

2013 GT500 Coupe - HPW with Black Stripes - SVT PP - SVT TP - Redline Hood Struts - Yeager Bros Front Gravel Guards - Bob's Oil Separator -AirAid Blue Non-Oiled Air Filter - CarboTech 1521 Ceramic Brake Pads - Resonator Eliminator Kit - WeatherTech Floor Mats - Craig’s No Drill License Plate Bracket
Car Ordered 5-27-2012 - Build Date 1-14-2013 - Delivered 1-26-2013


#46 OFFLINE   corepuncher

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Posted 29 November 2012 - 07:01 PM

Great thanks! I noticed the 2012 mustang 1st gear is wrong...it should be 2.97 FYI.

2011: http://media.ford.com/images/10031/2011_GT500_Specs.pdf
2012: http://media.ford.co...GT500_Specs.pdf
2013: http://media.ford.co...GT500_Specs.pdf
2011 GT500 Shelby Mustang + SVTPP + NAV Delivered on: July 6th, 2011
Sterling Grey Metallic + Wide Black Matte Stripes
Mods (performance):Ford TVS + 2.59", CJ TB, C&R Heat Exchanger, 170 deg thermostat, Roush Tank, Resonator Eliminator, Airaid Blue Filter
20" Asanti 3-Piece forged rims with Michelin Pilot Super Sport Tires (255 F, 295 R)
Mods (dress up):Carroll Shelby Signature Plate, 20% Tint, Turn signal & Quarter marker light tint,
chrome door bezel, locks, handles, headlight knob, map lights, seat adjustment levers.

Stereo: JL C5-570x front doors, JL C2-570x rear, Jl Cleansweep + DX400 Amp, Memphis 1000D Amp + 12" Diamond Sub

#47 OFFLINE   Snoopy49

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Posted 29 November 2012 - 08:12 PM

2012 GT500 Owners Manual Supplement - Page 33

Gear ratios

1st - 2.98

2nd - 1.78

3rd - 1.30

4th - 1.00

5th - 0.74

6th - 0.50

Reverse - 2.90

Attached Files


Edited by Snoopy49, 29 November 2012 - 08:15 PM.

2013 GT500 Coupe - HPW with Black Stripes - SVT PP - SVT TP - Redline Hood Struts - Yeager Bros Front Gravel Guards - Bob's Oil Separator -AirAid Blue Non-Oiled Air Filter - CarboTech 1521 Ceramic Brake Pads - Resonator Eliminator Kit - WeatherTech Floor Mats - Craig’s No Drill License Plate Bracket
Car Ordered 5-27-2012 - Build Date 1-14-2013 - Delivered 1-26-2013


#48 OFFLINE   Albino500

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Posted 29 November 2012 - 08:20 PM

2012 GT500 Owners Manual Supplement - Page 33

Gear ratios

1st - 2.98

2nd - 1.78

3rd - 1.30

4th - 1.00

5th - 0.74


6th - 0.50

Reverse - 2.90


They just rounded up to 2.98 instead of 2.97 and this is the same as the 2011 GT500 . Isn't that what you drive corepuncher ? Your running a 296/35-20 so your diameter should be 28.13" with 740 revs per mile. You have down that you have dynoed your car - any chance of seeing what the torque and HP curves look like ? Snoopy49 - nice spreadsheet !

Edited by Albino500, 29 November 2012 - 08:24 PM.

2007 GT500 Built on 7/27/2006
#918 of a build of 8152 coupes
#212 of 2252 in Performance White

Member of Terlingua Racing Team
Member of the "Clean Butt Club" - Class of 2010
2012 Shelby American 50th Anniversary Vegas Bash Car Show "Class" Award Winner

2007 SGT-California Edition Built on 5/15/2007
CSM#07SGT4755
1 of 89 Shelby GT-California Editions done in Performance White/Silver Stripes
Converted to " SCCA SMG Class " race car - 2/04/2013

#49 OFFLINE   corepuncher

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Posted 29 November 2012 - 08:39 PM

Wow so Ford has two documents that disagree by 0.01. I'm going to sell my car over this.

Here is the chart. Looks like my HP is 20-30 more than the stock 2013's...torque right there or maybe 5 lower.

Posted Image

Edited by corepuncher, 09 December 2012 - 03:11 AM.

2011 GT500 Shelby Mustang + SVTPP + NAV Delivered on: July 6th, 2011
Sterling Grey Metallic + Wide Black Matte Stripes
Mods (performance):Ford TVS + 2.59", CJ TB, C&R Heat Exchanger, 170 deg thermostat, Roush Tank, Resonator Eliminator, Airaid Blue Filter
20" Asanti 3-Piece forged rims with Michelin Pilot Super Sport Tires (255 F, 295 R)
Mods (dress up):Carroll Shelby Signature Plate, 20% Tint, Turn signal & Quarter marker light tint,
chrome door bezel, locks, handles, headlight knob, map lights, seat adjustment levers.

Stereo: JL C5-570x front doors, JL C2-570x rear, Jl Cleansweep + DX400 Amp, Memphis 1000D Amp + 12" Diamond Sub

#50 OFFLINE   Albino500

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Posted 29 November 2012 - 09:00 PM

OK Cool - Let's play . Let's just say 6000 RPM for redline and because I'm partial to the 3.27:1 rear end gears I'm going to use those and the 295/35-20 tires.

1st gear - take it to 6000 RPM = 51.7 MPH - shift to 2nd ( RPM drops 2400 to 3600 RPMs)
2nd gear - take it to 6000 RPM=86.27 MPH - shift to 3rd (RPM drops 1620 to 4380 RPMs)
3rd gear - take it to 6000 RPM=118.12 MPH - shift to 4th (RPM drops 1385 to 4615 RPMs)
4th gear - take it to 6000 RPM=153.55 MPH - shift to 5th (RPM drops 1560 to 4440 RPMs) - Really if you are lucky to have a tail wind
5th gear - take it to 6000 RPM= 207.5 MPH - shift to 6th (if you think you can) (RPM drops1945 to 4055 RPMs) and if you want to chase after Van keep your foot on the gas. LOL
2007 GT500 Built on 7/27/2006
#918 of a build of 8152 coupes
#212 of 2252 in Performance White

Member of Terlingua Racing Team
Member of the "Clean Butt Club" - Class of 2010
2012 Shelby American 50th Anniversary Vegas Bash Car Show "Class" Award Winner

2007 SGT-California Edition Built on 5/15/2007
CSM#07SGT4755
1 of 89 Shelby GT-California Editions done in Performance White/Silver Stripes
Converted to " SCCA SMG Class " race car - 2/04/2013




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