6speed with 3.73
Thread Starter
Advanced
Joined: Feb 2005
Posts: 56
Likes: 0
From: Leavenworth KS
6speed with 3.73
Thinking of changing 1989 auto trans with 3.73 rear end to 6 speed manual trans. Do I need to change the 3.73 rear end, what are the pro's and con's to this setup if possible? Thanks, Sean
Le Mans Master
Joined: Nov 2006
Posts: 5,032
Likes: 204
From: Greenwood Indiana
2021 C4 of the Year - Modified Finalist
C4 of Year Finalist (appearance mods) 2019
If your rear in the car is still a Dana 36, it won't stand up to the abuse it will receive from a stick. 
Besides that, a 3.73 or 4.10 would work very well with a 6spd.
Besides that, a 3.73 or 4.10 would work very well with a 6spd.
Instructor
Joined: Dec 2006
Posts: 195
Likes: 0
From: Savannah Georgia
Instructor
Joined: Dec 2005
Posts: 188
Likes: 0
From: Riverside CA
If you considering a swap to ZF, I can tell you it is a lot of work!!!
Fabrication includes tunnel modification that require cutting and re-fiberglass work to make room needed for the ZF shifter.
You may PM Me if you decide to go through with it. I have pics and I can save you some frustration.
I did mine and love it!!
I only have 3:07 in now but I want to change to 3:73's
In fact I would go lower like 3.90 or 4.11 but I think 3.73 is it for a D36.
The ZF has a 2:1 Overdrive (.5)
3.73 will only be turning like 1700 RPM at 70 MPH. With 4.11's you would only be turning 1900 RPM.
Fabrication includes tunnel modification that require cutting and re-fiberglass work to make room needed for the ZF shifter.
You may PM Me if you decide to go through with it. I have pics and I can save you some frustration.
I did mine and love it!!
I only have 3:07 in now but I want to change to 3:73's
In fact I would go lower like 3.90 or 4.11 but I think 3.73 is it for a D36.
The ZF has a 2:1 Overdrive (.5)
3.73 will only be turning like 1700 RPM at 70 MPH. With 4.11's you would only be turning 1900 RPM.
