6 speed transmission
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
The units from 89-92 are called the "black tag" units. They have straighter cut gears, are a little more noisy, and are stronger with something like a 450 ft/lb rating. Owners complained about gear whine and in 1993 the tranny got different cut gears to cut down on noise. This also cut down on the strength somewhat I think to a 400 ft/lb rating.
Melting Slicks
Joined: May 2001
Posts: 2,161
Likes: 0
From: Tyler TX
Re: (college_guy)
There is another difference...and it's an important one. When they went to the new transmission in 93, they also made the diameter of the input shaft housing smaller. Thus, a throwout bearing for a 93-96 ZF6....will JAM on and damage the input shaft of an earlier 88-92 ZF6. This will also cause the transmission to be stuck in the car and NEARLY impossible to take out.
[Modified by 91-Z07Coupe, 12:34 PM 7/23/2002]
[Modified by 91-Z07Coupe, 12:34 PM 7/23/2002]
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Melting Slicks
Joined: May 2001
Posts: 2,161
Likes: 0
From: Tyler TX
Re: 6 speed transmission (college_guy)
You MUST use the clutch and throwout bearing for the year of the transmission. While the clutches are the same, take the throwout bearing you get and slide it on the input shaft housing. It should slide on easily and then get progressively tighter as you slide it towards the transmission case (the housing is slightly tapered). If it slides easily all the way to the case and is still loose, you have an early model bearing on a late model transmission. If the bearing slides on the housing but won't go all the way ot the case, you have a late model bearing on an early model transmission (which is what happened to me)