rear diff swap
Thread Starter
2nd Gear
Joined: Jul 2014
Posts: 2
Likes: 0
From: Mt top pa
rear diff swap
Hoping for help...I have a 1999 base model with 2:73 diff. I picked up. 3:42 from a 2001 manual. I see the ring gear is exposed. I haven't taken mine out yet. Is there a cover that needs to be swapped as well or does that ring gear remain open when bolted to the auto transmission? I'm sure I'll see more when the 273 is removed I'm looking for a heads up before hand. Thanks
AMP Racing
Joined: Aug 2006
Posts: 10,752
Likes: 587
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
There is a cover between the diff and the trans. You'll see it when you pull them apart.
You'll have to get your PCM reprogrammed for the gear change.
You will love the responsiveness of your car with the change.
You'll have to get your PCM reprogrammed for the gear change.
You will love the responsiveness of your car with the change.
Instructor
Joined: Dec 2009
Posts: 162
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From: Mesquite Tx
....xzo
Drifting
Joined: Jan 2012
Posts: 1,341
Likes: 8
From: Hopatcong New Jersey
(although if you're careful enough while removing the plate and you don't damage the seal you should be fine reusing it)
I would definitely replace the oring that goes around the plate, and definitely replace the output shaft seals on the diff before you install it.
The plate is labeled for "trans side" so as long as you can read you should be fine.
