Differential swap help
Thread Starter
1st Gear
Joined: Jun 2016
Posts: 1
Likes: 0
Differential swap help
So I have a 1998 corvette auto and want to swap it to a z06 342 differential.. if I order the entire dif will it be direct bolt on? Or do I need additional parts? Any help is much appreciated! 😃
Instructor
Joined: Sep 2014
Posts: 125
Likes: 10
From: Lewiston California
Diff swap
Im doing the same thing next week or so, let me know how yours goes. I understand the o rings should be changed, but GMparts said not available? Do you know where to get them?
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
Here's the adapter plate I transferred from my 2.73 diff to my 3.42 diff a few years ago. It's held in essentially by the O-ring so it's not pressed in with a lot of force. You should replace the large, outer O-ring and shaft seal while it's out.
This is the large seal plate O-ring at Cultrag. Good idea to have a spare incase yours is trashed during the swap.
http://www.cultragfactoryparts.com/oe-gm/12369456
This is the shaft seal.
Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 594
From: Prescott, Arizona
Keep in mind the point by feeder82, if you don't get the PCM reprogrammed, shift points will not be right, most noticeable at full throttle.
I am thinking that 3.42 was not a factory option for the A4 and if that is the case, a dealer will not have the reprogram available. You would have to go to a shop that has the knowhow to create new shift points at part and full throttle.
In my case, for a new 3.73 gear set, A&A Corvette in Oxnard CA got the job done.
I am thinking that 3.42 was not a factory option for the A4 and if that is the case, a dealer will not have the reprogram available. You would have to go to a shop that has the knowhow to create new shift points at part and full throttle.
In my case, for a new 3.73 gear set, A&A Corvette in Oxnard CA got the job done.
Instructor
Joined: Sep 2014
Posts: 125
Likes: 10
From: Lewiston California
3.42
Keep in mind the point by feeder82, if you don't get the PCM reprogrammed, shift points will not be right, most noticeable at full throttle.
I am thinking that 3.42 was not a factory option for the A4 and if that is the case, a dealer will not have the reprogram available. You would have to go to a shop that has the knowhow to create new shift points at part and full throttle.
In my case, for a new 3.73 gear set, A&A Corvette in Oxnard CA got the job done.
I am thinking that 3.42 was not a factory option for the A4 and if that is the case, a dealer will not have the reprogram available. You would have to go to a shop that has the knowhow to create new shift points at part and full throttle.
In my case, for a new 3.73 gear set, A&A Corvette in Oxnard CA got the job done.
Thanks alot, I found a sharp mechanic that thinks the Hypertech tuner would do the job, now Im having second thoughts. I think I need to find a shop, hopefully much closer than AA, although, I know there great.
Got any ideas of a shop in northern Ca, like Redding,
Chico or even Sacramento?
Instructor
Joined: Sep 2014
Posts: 125
Likes: 10
From: Lewiston California
ECS Mail order tuning
Thanks alot, I found a sharp mechanic that thinks the Hypertech tuner would do the job, now Im having second thoughts. I think I need to find a shop, hopefully much closer than AA, although, I know there great.
Got any ideas of a shop in northern Ca, like Redding,
Chico or even Sacramento?
Got any ideas of a shop in northern Ca, like Redding,
Chico or even Sacramento?
I just got off the phone with Doug at ESC mail order tuning, I think thats the way to go for me...
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I agree completely!
Good speaking with you.
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Instructor
Joined: Sep 2014
Posts: 125
Likes: 10
From: Lewiston California
3.42 Gear Swap
I am happy to say that I have a unique 1998 A4 with a 3.42 Z06 differential..Thanks to Doug at ECS for great work and a quick turnaround. And Tony at Action Axle in Redding, Ca for a great job! Oh, and its frickn badazz!
Last edited by harrykerry; Apr 15, 2017 at 01:33 AM.