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

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Old 07-17-2013, 07:22 PM   #1
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3.91s in an a6 ss

I was wondering how well the 3.91s from the 1le would perform if I put them in my ss. Thanks for the input
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Old 07-17-2013, 07:28 PM   #2
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Traction will be an issue.
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Old 07-17-2013, 08:11 PM   #3
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Traction will be an issue.
How so?
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Old 07-17-2013, 09:16 PM   #4
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1st gear will be very steep. 2nd gear will start getting good.
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Old 07-17-2013, 09:17 PM   #5
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Also if you start adding power to the car it will get worse.
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Old 07-17-2013, 09:20 PM   #6
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I would imagine a good set of tires and a good tune would put you in the green. I don't think it would be much different than say 18" tires but that's just a guess.
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Old 07-17-2013, 10:49 PM   #7
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I would imagine a good set of tires and a good tune would put you in the green. I don't think it would be much different than say 18" tires but that's just a guess.
Well I'm swapping out my wheels and tires for zl1 wheels and tires
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Old 07-17-2013, 11:01 PM   #8
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Also if you start adding power to the car it will get worse.
Well I am getting better tires so that should def help. But there should be no problems other than traction?
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Old 07-18-2013, 12:54 AM   #9
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You should read the sticky "rear end gears 101." I think your 1st gear would be wasted. The auto SS should go with 3.73. I wouldn't experiment with anything higher given the expense of this modification, because it will be just as expensive to undo it.
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Old 07-18-2013, 01:34 AM   #10
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Well I am getting better tires so that should def help. But there should be no problems other than traction?
Have you tried hooking up with stock rear diff and stock tires yet? You'll find the 3.27 doesn't have a problem spinning a tire.
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Old 07-18-2013, 10:47 AM   #11
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I changed out my diff to 3.91's and holy sh!t did it make a huge difference. The driving band is so much better in all gears and it pulls like a raped ape! Best mod I ever did so far....my gas mileage has not suffered a bit...
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Old 07-18-2013, 01:21 PM   #12
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I changed out my diff to 3.91's and holy sh!t did it make a huge difference. The driving band is so much better in all gears and it pulls like a raped ape! Best mod I ever did so far....my gas mileage has not suffered a bit...
Good to know! How about your tune? Do you have a thread on your experience specifically? I'd like to see the whole process to learn how/what to do/not to do. Thanks!
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Old 07-18-2013, 01:35 PM   #13
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They'll be hard to hook WOT in 1st and maybe 2nd on street tires, but I woudn't mind more gear when I'm cruising at 50-60mph. Going WOT then is not always impressive.
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Old 07-18-2013, 01:40 PM   #14
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Good to know! How about your tune? Do you have a thread on your experience specifically? I'd like to see the whole process to learn how/what to do/not to do. Thanks!
he has a LS3 M6 according to his info on the left. Thats different then an A6
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Old 07-18-2013, 01:50 PM   #15
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No thread. Simple swap out, no tune modifications needed. about a 1300.00 swap with a core trade.






Quote:
Originally Posted by OmniCamaro View Post
Good to know! How about your tune? Do you have a thread on your experience specifically? I'd like to see the whole process to learn how/what to do/not to do. Thanks!
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Old 07-18-2013, 02:46 PM   #16
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he has a LS3 M6 according to his info on the left. Thats different then an A6
Gotchya. I just assumed he knew where he was posting.
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Old 07-18-2013, 02:47 PM   #17
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No thread. Simple swap out, no tune modifications needed. about a 1300.00 swap with a core trade.

LOL, this thread is about A6 gear swaps. You have an LS3... Any particular reason you posted? Just curious.
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Old 07-18-2013, 03:47 PM   #18
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LOL, this thread is about A6 gear swaps. You have an LS3... Any particular reason you posted? Just curious.
A gear swap is a gear swap...some say you can't use the 3.91's in an A6, not of the same opinion...sorry I intruded on the A6 party...
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Old 07-18-2013, 04:53 PM   #19
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A gear swap is a gear swap...some say you can't use the 3.91's in an A6, not of the same opinion...sorry I intruded on the A6 party...
A gear swap is a gear swap if both transmissions had the same ratios. They do not. A 3.91 in a M6 is equivalent to 3.73 in A6. In my opinion ideally would be max 3.45 for FI or 500+ HP and 3.73 for a bolt on car.
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Old 07-18-2013, 09:23 PM   #20
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A gear swap is a gear swap...some say you can't use the 3.91's in an A6, not of the same opinion...sorry I intruded on the A6 party...
I would have never known if someone else didn't point it out, lol. You could have 4 Camaro's and one is an A6 for all I know. No worries. But like others are stating, I'm fairly certain it's a whole other game with an auto.
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Old 07-19-2013, 06:41 AM   #21
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You WILL need a tune for a gear swap or your speedometer will be off calibrated in addition to our A6 transmission shifting by the computer and RPM which also needs to be adjusted to go with the new gear.
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Old 07-19-2013, 01:42 PM   #22
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Love mine,great on the street.Car feels 500 hundred pounds lighter.The 3.91 gears turns it into a totally different car.It should come from the factory that way.made the car a lot more fun.
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Old 07-20-2013, 02:11 PM   #23
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A6 With 3.91 gears is like a M6 with 4.10 gears, AWESOME. 1st gear works just fine thank you very much, the car hooks up and takes off like a rocket. With just the speedo adjustment it just removes the hole you had to dig out of off of the line. With a good trans tune you will break loose at shifts thru 3rd gear, which is AWESOME. With a good tune this trans shifts QUICK! Every one with a manual will tell you No No No, because you will pull hard on a Manual and be consistent as all hell. Factory pulled unit from Ofer had it swapped for less that $800. Adding boost she will be a tire shredder for sure.

FYI 75mph is 2200rpm in 6th gear, and you can accelerate in 6th now, before she bogged down.
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