Differences in 3.42 differential?

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May 9, 2008 | 10:08 PM

futuretech

Thread Starter

Drifting

Joined: Aug 2007

Posts: 1,495

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From: Homer Glen IL

Differences in 3.42 differential?

Will a 3.42 gear out of a manual C5 go into an automatic? I heard of some error codes caused by this combination.

May 9, 2008 | 10:10 PM

Rhode Warrior

Melting Slicks

Joined: Sep 2005

Posts: 2,625

Likes: 1

From: Rhode Island

Yes you can use 3.42's in an A4, that's what I run. You just have to make the necessary changes to the program so your car will shift properly.

May 9, 2008 | 10:20 PM

madmatt9471

Team Owner

Joined: May 2006

Posts: 21,473

Likes: 356

From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----

Yes! I do as well!

But you will need to use a handheld tuner or your local tuner will need to make changes to the PCM

Here are the differences in the RPM's:

Quote:

Originally Posted by DavzC5

Thanks,Matt

May 9, 2008 | 10:25 PM

futuretech

Thread Starter

Drifting

Joined: Aug 2007

Posts: 1,495

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From: Homer Glen IL

Thanks guys. The picture says it all Matt.

May 9, 2008 | 10:31 PM

Mike Mercury

Team Owner

Joined: Apr 2001

Posts: 54,204

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From: S.W. Ohio. . . . . . NRA Life Member

Quote:

Originally Posted by futuretech

Will a 3.42 gear out of a manual C5 go into an automatic?

don't forget to transfer the seal plate from your A4 carrier:

to the manual carrier.

May 9, 2008 | 10:32 PM

futuretech

Thread Starter

Drifting

Joined: Aug 2007

Posts: 1,495

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From: Homer Glen IL

Thanks Mike. You have been very helpful on some of my other threads!

May 10, 2008 | 02:17 AM

EDenney

Racer

Joined: Apr 2008

Posts: 408

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From: Santa Clarita CA

Thanks Matt, that chart is very helpful!

May 10, 2008 | 02:33 AM

jdmvette

Night Owl for life

Joined: Nov 2003

Posts: 24,725

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From: Bugs Bunny should'a made a left turn here

Quote:

Originally Posted by EDenney

Thanks Matt, that chart is very helpful!

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May 10, 2008 | 08:57 AM

Patches

Team Owner

Joined: Sep 2001

Posts: 23,283

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From: Lake Elsinore, CA

I swapped the 3.42 out of my M6 C5 into my wife's A4. I reprogrammed the tranny pressures and shift points using EFI Live.

http://forums.corvetteforum.com/show....php?t=1753571

I bought new pieces from the dealer to add to the diff rather than pulling the one's off her car. Here's the plate.