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Old 04-18-2011, 01:29 PM   #1
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L99/A6 Differential gear change

Im looking at changing my ring and pinion out to get more punch off the line. I dont take my car to the track and mostly stay in town so no need for it to be able to go 140mph for long periods. That being said I have done some searching around on here and found quite a few people that have done gear swaps with the LS3/M6 combo but not many who have done them with the automatic. I would think that the 3.73 set up would be good but the 4.10 or 4.11 seems like it might be a little better. Is there anybody out there who has done one and liked the combo that they got?
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Old 04-18-2011, 02:22 PM   #2
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I was looking into a gear swap for a while but have decided to wait because of things I've heard on the 4.10 breaking and being a little too low for daily driving use.

I have a LS3 so going from a 3.45 - 3.73 isn't a whole lot and is hard for me to justify the $1200 cost.

Now, with an L99 you'll go from a 3.27 to 3.73 which you'll definately feel that. The 3.73 is supposed to be a solid gear and is what they are putting in the ZL1.

From the research I've done the best gear for the L99 seems to be a 3.73. Alot of that has to do with the gearing in the transmission as well. It's different than the gearing in M6. The 4.10 on an A6 is supposed to be really low. Probably too low for daily driving use.

If I had an A6 I would pull the trigger on the gears.....but that's me and my car is a daily driver as well. Being that I have an M6 I'm going to wait a little while and hope to find a used 3.73 some day.
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Old 04-18-2011, 03:59 PM   #3
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I have the AAM 3.70's in my A6 and love it. Either them or the Richmond 3:73's would be a good choice. AAM supplies the stock 3:27's in your A6.
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Old 04-18-2011, 04:03 PM   #4
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i have the aam 3.70 in my m6 car, my buddy has my 3.45 in his a6 car and said he can feel a difference.
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Old 04-18-2011, 04:22 PM   #5
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About how much are ya'll paying to have the gears swapped. I've basically seen about $1100 for the swap with another $100 for some rearend bushings.

I'm not sure that's worth the difference for an M6.....A6, absolutley I would do it.
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Old 04-18-2011, 04:28 PM   #6
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i think the rebuild kit is like $250.00 or so, aam 3.70 gear from lingenfelter are $700.00 i believe, i paid some one $175.00 to install gears (i took center chunk out and brought to him) so you should be right around $1100.00 for everything. or you can find a m6 guy that is looking to do it and trade him your rearend for his plus give him a little cash (only if you would want to jump up to the 3.45)
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Old 04-18-2011, 04:42 PM   #7
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Hugh difference, I have 3.73 richmond gears, car was amazing!! now when u add the 3200 stall torque converter LOOK OUT! car is a beast.. Completely different launch!..you will eat up tires along with most people that pull up next to you... def worth it, but def do the TQ
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Old 04-18-2011, 04:55 PM   #8
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Originally Posted by JKEP44 View Post
Im looking at changing my ring and pinion out to get more punch off the line. I dont take my car to the track and mostly stay in town so no need for it to be able to go 140mph for long periods. That being said I have done some searching around on here and found quite a few people that have done gear swaps with the LS3/M6 combo but not many who have done them with the automatic. I would think that the 3.73 set up would be good but the 4.10 or 4.11 seems like it might be a little better. Is there anybody out there who has done one and liked the combo that they got?
When equipped the the automatic transmission (A6) the SS comes with a 3.27 rear end and cruises at 1795 RPM at 70 MPH. By upgrading the factory 3.27s in the stock A6 equipped Camaro SS to the 3.73s you will realize an equivalent torque gain of approximately 15% or 61.5 rear wheel lb.-ft. of torque and cruise at 2050 RPM at 70 MPH. By upgrading the A6 to the 4.11s you will realize an equivalent torque gain of approximately 27% or 110.7 rear wheel lb.-ft. of torque and cruise at 2250 RPM at 70 MPH. The A6 transmission is geared more aggressively than the M6 SS so we have found that 3.73 is the ideal gear for most A6 equipped SS applications.

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I have 3.73s and love them!! It give you that "push you in your seat felling".
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Got 3.73's in mine over the weekend - wow. I did notice the increase in RPM as well. It's pretty expensive but talk about the butt in your seat. The head rest is now a head stop.
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3.73's are great in the auto, you can really feel it pull through the gears faster, and hwy cruise rpm is only about 250rpm higher
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Old 04-18-2011, 07:14 PM   #9
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I wish I could find someone around my way that would actually install a 3.73 in my A6. No one wants to touch the thing. They act like I'm asking them to work on a spaceship!
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Old 04-18-2011, 07:48 PM   #10
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I wish I could find someone around my way that would actually install a 3.73 in my A6. No one wants to touch the thing. They act like I'm asking them to work on a spaceship!
call livernois motorsports they will pick your car up...they did my stuff and the transport wasnt that expensive
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Old 04-18-2011, 08:52 PM   #11
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What type rear end is this anyway? I haven't even crawled under the car to look.
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Old 04-18-2011, 09:11 PM   #12
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I have said before that the buddy gear swap thing works out great. Find a M6 guy that wants gears. Put the M6 3.45 rear center section in the A6 car. Put the new gears in the A6 center section and install in the M6 car. Share the cost - everyone wins!
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Old 04-18-2011, 11:06 PM   #13
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I had a new complete JRE diff installed in my L99 and I can say it made a very noticable difference. You would also be wise to get a custom tune on your car that turns off the torque management system which also give your car alot more attitude.

My rear end has the billet caps, posi upgrade and I also replaced the Diff bushings. I also replaced the trailing arms with a set of Pfadt arms and replaced the bushing as well. Dramatically stiffened up the rear end. For day to day driving I am still undecided about the posi upgrade because its TIGHT on the slow speed tight corners in parking lots and such. On the high way and normal use, no real issue.

There is slightly more gear noise at speeds from around 43 to 48 mph but nothing below this, nothing above this. This may simply be from the more solid bushings as well instead of the gears themselves.

All in all, very happy, a bit tighter then I would have liked but getting used to it but the launch kick in the rear is noticably more potent. Since I am getting the car ready for a supercharger installation, I will take a bit of tight corner popping for solid two wheel launches.

In the L99, you will see and feel a noticable difference with the 3.73 gear upgrades. Is it worth the cost. I put $2350 into the JRE rear and would do it again.

Kirby
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Old 04-19-2011, 02:11 PM   #14
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Originally Posted by Roger Ramjet View Post
I have said before that the buddy gear swap thing works out great. Find a M6 guy that wants gears. Put the M6 3.45 rear center section in the A6 car. Put the new gears in the A6 center section and install in the M6 car. Share the cost - everyone wins!
thats the way i did it, couldn't have been happier
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Old 04-21-2011, 09:55 PM   #15
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So is this diff carrier different from the "standard" GM 8.5" 10 bolt? I see that they are listed as an 8.6? Is this a completely new rear end that only went on Camaros? The Yukons, 1500 pickups and a host of others use the 8.5 for 2011.
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Old 04-21-2011, 10:29 PM   #16
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So is this diff carrier different from the "standard" GM 8.5" 10 bolt? I see that they are listed as an 8.6? Is this a completely new rear end that only went on Camaros? The Yukons, 1500 pickups and a host of others use the 8.5 for 2011.
yes it is different, this diff carrier only come is the camaro. i do think the shims and bearings may be the same for other applications but the housing is different.
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Old 04-21-2011, 11:14 PM   #17
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Man....I would be intrested in sharing the costs with an A6 rearend. $1100 to go from 3.45 to 3.70 is a bit much but $550 I would do.

I might just have to do something like this soon.
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Old 04-21-2011, 11:49 PM   #18
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I honestly cant believe that this car came with a 3.27 in it anyway, but then again...why build a true muscle car with a fuel economy designed cam and AFM system. Isnt that what the 6 cylinder models were for? Anyway, I think if I am going to do it I am going to get exactly what I want and do 3.73's.
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Old 04-22-2011, 09:05 AM   #19
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Good choice.

Do it and I bet you'll love it. I just wish it wasn't so damn expensive to do.
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Old 04-22-2011, 09:13 AM   #20
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Good choice.

Do it and I bet you'll love it. I just wish it wasn't so damn expensive to do.
I agree. Would love to go to 3.70's in my LS3 M6 but at this time I can't justify the cost. The only way it is feasible is to have someone local with a L99 A6 with the 3.27 pumpkin that would be happy with the 3.45's to swap with and some $$ to make the cost reasonable for both parties.
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Old 04-22-2011, 09:58 AM   #21
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I wish I could find someone around my way that would actually install a 3.73 in my A6. No one wants to touch the thing. They act like I'm asking them to work on a spaceship!
That's funny, but it's a good thing. Too many shops out there that say they can do something when the really don't know what they're doing.

Gears should be installed by someone that really knows what they're doing.
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Old 04-22-2011, 10:04 AM   #22
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Originally Posted by Fiftydriver View Post
I had a new complete JRE diff installed in my L99 and I can say it made a very noticable difference. You would also be wise to get a custom tune on your car that turns off the torque management system which also give your car alot more attitude.

My rear end has the billet caps, posi upgrade and I also replaced the Diff bushings. I also replaced the trailing arms with a set of Pfadt arms and replaced the bushing as well. Dramatically stiffened up the rear end. For day to day driving I am still undecided about the posi upgrade because its TIGHT on the slow speed tight corners in parking lots and such. On the high way and normal use, no real issue.

There is slightly more gear noise at speeds from around 43 to 48 mph but nothing below this, nothing above this. This may simply be from the more solid bushings as well instead of the gears themselves.

All in all, very happy, a bit tighter then I would have liked but getting used to it but the launch kick in the rear is noticably more potent. Since I am getting the car ready for a supercharger installation, I will take a bit of tight corner popping for solid two wheel launches.

In the L99, you will see and feel a noticable difference with the 3.73 gear upgrades. Is it worth the cost. I put $2350 into the JRE rear and would do it again.

Kirby
Were both the analog and digital speedometers recalibrated when you had the gear change?

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Old 04-22-2011, 02:24 PM   #23
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I agree. Would love to go to 3.70's in my LS3 M6 but at this time I can't justify the cost. The only way it is feasible is to have someone local with a L99 A6 with the 3.27 pumpkin that would be happy with the 3.45's to swap with and some $$ to make the cost reasonable for both parties.
Ed M.
Yeah, I suppose if it was a local deal where no shipping was involved on my side I would be willing to do 3.45's. I don't think they would be the improvement I am looking for but still a major improvement over stock. I have done six of my own sets over the years (1994 Toyota pickup, 1984 chevy S-10, and most recently my 2004 duramax. Both front and rear). If you take your time and have the right tools you can do it successfully. That being said I don't think I have the experience to do this one, and will be taking it to a shop. I guess that is one more advantage of the buddy swap for the A6 guy is his portion would be simple and done in a well equipped personal garage.
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Old 04-22-2011, 04:31 PM   #24
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Man....I would be intrested in sharing the costs with an A6 rearend. $1100 to go from 3.45 to 3.70 is a bit much but $550 I would do.

I might just have to do something like this soon.
Plenty of people spend that kind of money on cat back exhaust for zero performance gain. At least with gears you get an awesome performance gain! Money well spent in my opinion.
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