Any ZF Transmission Differences - ZR-1 Net Registry Forums

billybaloneey · 10-09-2008

Are there any differences, outside or internal, in a base model C4 and a ZR-1 ZF transmission. In other words can a 9x base model C4 ZF transmission be interchanged with a 9x ZR-1 ZF transmission? What year ZF's are compatible with each other?

Thanks

flyin ryan · 10-09-2008

only real difference is the lenght of the input shaft.
L98/LT1/LT4 ZF is 159.5mm or 6.279"
LT-5 ZF is 190.5mm or 7.50"

tccrab · 10-09-2008

Quote:

Originally Posted by billybaloneey

Are there any differences, outside or internal, in a base model C4 and a ZR-1 ZF transmission. In other words can a 9x base model C4 ZF transmission be interchanged with a 9x ZR-1 ZF transmission? What year ZF's are compatible with each other?

Thanks

The ZF6 for the base C4 has a different length input shaft, otherwise the internals are the same.
So to answer your question, yes the ZF's are interchangeable...
But....
There are "Black Tag" and "Blue Tag" versions.
And later model ZF's have slightly different exhaust hanger setups, as well as a different plug on the speed sensor.

Here's more info that you're going to want or need, but here it is.
I did a lot of research when the 2nd gear synchro went out.
http://www.zr1netregistry.com/forum/...t=transmission

Let me know if you need any help, tips, ideas, etc.

TomC
"Crabs"

10-09-2008

Input shaft will set you back about 800 bucks, before labor.

Chris_32212 · 10-14-2008

The best guy to talk to on this subject is Bill at
zfdoc.com
he is the ZF and T56 GURU!!!
his email and phone are listed on his page and he actually answers the phone every time i call him with a transmission question. great guy and very honest pricing too. he told me once that the later 93 ZR-1 transmissions were actually rated lower because GM abandoned the idea of a twin turbo ZR-1 and didn't need the extra power capabillity. but i cant remember the actual torque rating numbers he told me. but like i said, he will have your answers.

Chris

10-09-2008	#1
billybaloneey Join Date: May 2008 Location: Mauriceville, Texas Posts: 179	Any ZF Transmission Differences Are there any differences, outside or internal, in a base model C4 and a ZR-1 ZF transmission. In other words can a 9x base model C4 ZF transmission be interchanged with a 9x ZR-1 ZF transmission? What year ZF's are compatible with each other? Thanks __________________ Clint aka billybaloneey '94 - C4 ZR-1 #445 - Black/Black '05 - C6 silver/black 6sp '85 - C4 white/graphite (almost done) automatic '78 - C3 silver/black (a work in progress) automatic

10-09-2008	#2
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,742	Re: Any ZF Transmission Differences only real difference is the lenght of the input shaft. L98/LT1/LT4 ZF is 159.5mm or 6.279" LT-5 ZF is 190.5mm or 7.50" __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

10-09-2008	#4
Jeffvette Guest Posts: n/a	Re: Any ZF Transmission Differences Input shaft will set you back about 800 bucks, before labor.

10-14-2008	#5
Chris_32212 Join Date: Sep 2008 Location: Vancouver Posts: 224	Re: Any ZF Transmission Differences The best guy to talk to on this subject is Bill at zfdoc.com he is the ZF and T56 GURU!!! his email and phone are listed on his page and he actually answers the phone every time i call him with a transmission question. great guy and very honest pricing too. he told me once that the later 93 ZR-1 transmissions were actually rated lower because GM abandoned the idea of a twin turbo ZR-1 and didn't need the extra power capabillity. but i cant remember the actual torque rating numbers he told me. but like i said, he will have your answers. Chris