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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 06-05-2013, 01:17 AM   #1
AmericanMuscleCars
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3.91 gears on my v6?

Ok, I want to switch to a 3.91 gear system, I have a 2013 1LT Automatic with Tap-Shifters. What is the price point and difficulty of this install?
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Old 06-05-2013, 01:26 AM   #2
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do they make one for that rear end? its uses a different one than the m6 v6 and the ss cars.

and holy first gear batman!!
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Old 06-05-2013, 05:52 AM   #3
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Ok, I want to switch to a 3.91 gear system, I have a 2013 1LT Automatic with Tap-Shifters. What is the price point and difficulty of this install?
The only way to put those gears in a V6 equipped with the auto is to swap the entire rear end. They drop in the V6 manual but not the auto.
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Old 06-05-2013, 07:15 AM   #4
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You need part of the V8 drive shaft, the halfshafts, the diff, and possibly the gears themselves, unless you get the diff from a 1LE.
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Old 06-05-2013, 07:30 AM   #5
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best you can do is 3.55, with stock rear.
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Old 06-05-2013, 08:23 AM   #6
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will 3.55 make a huge difference?
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Old 06-05-2013, 09:10 AM   #7
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will 3.55 make a huge difference?
Price point on the whole set up on the rear end for the 3.91 including everything? Or switching to the 3.55 is that a big difference?
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Old 06-05-2013, 09:37 AM   #8
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another reason i was dissapointed in my auto v6. no LSD
awesome car despite some minor flaws
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Old 06-05-2013, 09:44 AM   #9
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Best way i can think of is to go to a salvage yard and see if you can find any SS rear ends still intact for a good price
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Old 06-05-2013, 09:53 AM   #10
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Why do you want the 3.91 gears?
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Old 06-05-2013, 10:02 AM   #11
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will 3.55 make a huge difference?
for the price, I don't think so, but that's just me. something to consider, get smaller rims with smaller sidewall tires, so the overall diameter is smaller. With the smaller diameter and lighter rims, you will essentially be doing the same as getting a lower gear.
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Old 06-05-2013, 10:06 AM   #12
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You have to swap a few things before you can get the 3.91 gears.
ZAbeast had it fine while doing the supercharger install.
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Old 06-05-2013, 10:21 AM   #13
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You have to swap a few things before you can get the 3.91 gears.
ZAbeast had it fine while doing the supercharger install.
Does anybody have a roundabout price for the swapping of the rear ends plus everything needed or just switching to 3.51 gear, any price point?
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Old 06-05-2013, 10:52 AM   #14
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swapping the rear for the SS will cost upwards of 2k if i remember correctly. the gears arent included in that price. can any one chime in ?
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Old 06-05-2013, 11:43 AM   #15
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I picked up everything I needed except the drive shaft for $800. Don't remember how much the install was. That was with 3.45 gears, so you would still need to figure in the price of the 3.91 gears and installation.

I think you should really do some research beyond price. 3.91 is a lot of gear for the V6 A6. You will have to shift to third just to get up to 70 MPH and you will be running about 2200 RPMs at 70 in sixth gear.
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1/8 mile -- 7.158 @ 102.10 (20psi); old build
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Old 06-05-2013, 11:51 AM   #16
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I picked up everything I needed except the drive shaft for $800. Don't remember how much the install was. That was with 3.45 gears, so you would still need to figure in the price of the 3.91 gears and installation.

I think you should really do some research beyond price. 3.91 is a lot of gear for the V6 A6. You will have to shift to third just to get up to 70 MPH and you will be running about 2200 RPMs at 70 in sixth gear.
Meaning what I'm not too familiar with the gear systems.
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Old 06-05-2013, 11:53 AM   #17
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Gears are an awesome upgrade and made a big difference on my SS. Unfortunately, it sounds like an awful lot of work to do shorter than 3.55 on the V6. For the SS, the common recommendation is 3.70 for the auto, and 3.91 for the manual. So maybe in your case, 3.70's would work a little better. As for the install, that's something I wouldn't mess with myself. They have to be set up just right, or you will have problems.
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Old 06-05-2013, 11:54 AM   #18
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exactly what he is saying....getting gears if i remember correctly actually lowers your top speed. Youll also be using more gas at highway speeds due to being at higher rpms
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Old 06-05-2013, 11:55 AM   #19
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and to be completely honest i dont think 3.91 gears is worth it on a auto v6. considering the swaps youll have to make. On top of everything youll need a tune
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Old 06-05-2013, 11:57 AM   #20
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and to be completely honest i dont think 3.91 gears is worth it on a auto v6. considering the swaps youll have to make. On top of everything youll need a tune
Gotcha, I guess I'll just stick with getting my catch can then lol.
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Old 06-05-2013, 12:00 PM   #21
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Had mine done a couple weeks back. I went with 3.73's though. IF u are going to pay someone to do it figure $2k-$2300 depending options for everything. I went with BMR bushings and JRE clutches in the LSD unit.
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Old 06-05-2013, 12:12 PM   #22
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Meaning what I'm not too familiar with the gear systems.
Here is the MPH for each gear at 3800 RPM for the stock 3.27 gear on a A6 V6.

1st: 43
2nd: 76
3rd: 113
4th: 151
5th: 207
6th: 262

At 70 MPH in 6th you are running ~1800 RPM

Now with the 3.91 gear

1st: 36
2nd: 63
3rd: 95
4th: 127
5th: 173
6th: 219

At 70 MPH in 6th you are running ~2200 RPM

You gas mileage will be worse. Your first gear will be just about worthless, and you will probably have to tune it to shift sooner from 1st to 2nd to keep from hitting the rev limiter. That will put you lower in the RPMs when you hit second, below the sweet part of the power band. First fear might be fun with these gears, but it will probably make your car slower, not faster. I would not go above 3.55 on a A6 V6 unless you have something that really bumps up the low-end torque, or you got a custom torque converter to keep you in the power band. In my opinion, it isn't worth the effort until you have built the car to the power you want and you have the right torque converter. When all that's done get the right gear to match your power and output and get the greatest acceleration you can.
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Old 06-05-2013, 12:42 PM   #23
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We do the 3.55's in the open diff v6 A6 cars, or complete conversions to add the LSD diff and all components as well. Usually have it all in stock.
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Old 06-05-2013, 01:05 PM   #24
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We do the 3.55's in the open diff v6 A6 cars, or complete conversions to add the LSD diff and all components as well. Usually have it all in stock.
Price?
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Old 06-05-2013, 01:06 PM   #25
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Originally Posted by SC2150 View Post
We do the 3.55's in the open diff v6 A6 cars, or complete conversions to add the LSD diff and all components as well. Usually have it all in stock.
Quote:
Originally Posted by GretchenGotGrowl View Post
Here is the MPH for each gear at 3800 RPM for the stock 3.27 gear on a A6 V6.

1st: 43
2nd: 76
3rd: 113
4th: 151
5th: 207
6th: 262

At 70 MPH in 6th you are running ~1800 RPM

Now with the 3.91 gear

1st: 36
2nd: 63
3rd: 95
4th: 127
5th: 173
6th: 219

At 70 MPH in 6th you are running ~2200 RPM

You gas mileage will be worse. Your first gear will be just about worthless, and you will probably have to tune it to shift sooner from 1st to 2nd to keep from hitting the rev limiter. That will put you lower in the RPMs when you hit second, below the sweet part of the power band. First fear might be fun with these gears, but it will probably make your car slower, not faster. I would not go above 3.55 on a A6 V6 unless you have something that really bumps up the low-end torque, or you got a custom torque converter to keep you in the power band. In my opinion, it isn't worth the effort until you have built the car to the power you want and you have the right torque converter. When all that's done get the right gear to match your power and output and get the greatest acceleration you can.
Thanks! This is awesome info, I appreciate it! Cleared it up for me!
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