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Question: ZF 6 in a 1985???

John '85

Well-known member
Joined
Mar 22, 2006
Messages
57
Location
Fremont CA
Corvette
1985 Red Coupe TKO500 Z51
Now that I am having problems with my 4+3, see below (pops out of 2nd gear) I am looking at options, Will a ZF 6 speed fit into my '85? I have read about the Richmond ROD, but price is always an issue.
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,457
Location
CenCoast CA
Corvette
71 04 12 19
There is one little problem and that's the axle ratio. The stock ratio in an 85 manual is 3.07 and that isn't going to work very well with the ZF's 2.68 first gear. Also, the sixth gear will be too tall to use with an early L98. You'll need to also change the axle ratio to 3.45 and change the calibration in the ECM to reflect that.

If your 4+3 is popping out of gear, that's a problem in the gear box section which is just a Super T10. It will be far less expensive to pull the trans, remove the O.D. then repair the four-speed trans.
 

gmjunkie

Well-known member
Joined
Nov 11, 2004
Messages
4,548
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
There is one little problem and that's the axle ratio. The stock ratio in an 85 manual is 3.07 and that isn't going to work very well with the ZF's 2.68 first gear. Also, the sixth gear will be too tall to use with an early L98. You'll need to also change the axle ratio to 3.45 and change the calibration in the ECM to reflect that.

If your 4+3 is popping out of gear, that's a problem in the gear box section which is just a Super T10. It will be far less expensive to pull the trans, remove the O.D. then repair the four-speed trans.

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