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

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Old 02-06-2012, 09:27 PM   #1
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how hard is it to change out rear diff?

i have a L99 with those 3:27 gears, and am wanting to change out to a M6 Rear diff with the 3:45 gears, like many have done on here

how hard is it? is there a DIY post? i looked and couldnt find any

been wanting to do this for awhile to give the car more "oomph"

you dont have to do a re tune to change this out do you?
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Old 02-06-2012, 11:26 PM   #2
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When I broke my stock differential I put in a upgraded jre one with 3.45 gears.

I'm guessing you mean the whole case. It's not very hard. Lift the car, take wheels and all off, take off pipes, unscrew bolts lower it, replace with new case.

It's extremely simple.

Yes you need a re tune because you will be changing gears. Your shift points, speedometer, everything will need to be re-tuned.
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Old 02-07-2012, 06:03 AM   #3
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Quote:
Originally Posted by camslambam View Post
When I broke my stock differential I put in a upgraded jre one with 3.45 gears.

I'm guessing you mean the whole case. It's not very hard. Lift the car, take wheels and all off, take off pipes, unscrew bolts lower it, replace with new case.

It's extremely simple.

Yes you need a re tune because you will be changing gears. Your shift points, speedometer, everything will need to be re-tuned.
yeah the whole M6 diff...

i was hoping thats all there was too it....was just worried that maybe some sensor might be different and not re-plug in, or something technical like that

thanks for the response
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Old 02-07-2012, 09:10 AM   #4
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rather simple really.
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Old 02-07-2012, 10:03 AM   #5
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Just to clarify, are you referring to the Diff Cover/Girdle, or the Entire Differential?

As I recall, there is not a lot of room to change anything, so you will have to drop your rear-end. That means pulling the exhaust off, etc.
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Old 02-07-2012, 10:10 AM   #6
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with a buddy to help, it shouldn't be too hard....remove exhaust, axles, driveshaft and diff.

You'll need the right (big) socket for the axle nut (I think it's 32mm, but I'd confirm that first) and a torque wrench (and proper specs) to put it all back together correctly (unless you're just a "tighten the heck out of everything and go" type of guy). Use lock-tite on the driveshaft bolts...shouldn't really be any other surprises. And yes, tweak your tune to calibrate your speedometer.
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Old 02-08-2012, 10:53 AM   #7
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Quote:
Originally Posted by Grabber View Post
Just to clarify, are you referring to the Diff Cover/Girdle, or the Entire Differential?

As I recall, there is not a lot of room to change anything, so you will have to drop your rear-end. That means pulling the exhaust off, etc.
yeah, i shouldve been more specific, i have an opportunity to buy a complete rear diff from a M6 with the 3:45's to swap out my 3:27s from my L99

just wanted to make sure it was a direct swap over....nothing like sensors that dont swap over, etc...

thanks guys
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