ZF Question
Thread Starter
Pro
Joined: Mar 1999
Posts: 532
Likes: 0
From: Cleveland Ohio
ZF Question
I was under the impression that there were two ZF's. An early (90-93) and a late (94-96). The later not being as strong do to a redesign to quiet it down. Last night I was informed that there were indeed two but not as I thought. This chap stated that all small block ZF's were the same and that the one for the ZR1 was different. Anybody know for sure? Thanks, Frank
Team Owner
Joined: Mar 1999
Posts: 89,144
Likes: 3
From: Life's tough, wear a helmet.
Re: ZF Question (Frank C)
ZF 6-speeds began in '89.
And while I can't confirm this I seem to remember that the earlier ZFs (perhaps up to '92?) are the more robust ones.
I also don't think there is any difference between a regular ZF and the one's they put in the ZR1 but again, I'm not 100% sure.
Of course, I could be completely wrong. ;)
And while I can't confirm this I seem to remember that the earlier ZFs (perhaps up to '92?) are the more robust ones.
I also don't think there is any difference between a regular ZF and the one's they put in the ZR1 but again, I'm not 100% sure.
Of course, I could be completely wrong. ;)
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 109
From: Austin Texas
Re: ZF Question (Frank C)
There are, indeed, 4 different designs for the ZF6. I'm not sure on when they made the change, but there is a difference. The internals are identical between the ZR1 ZF's and the standard ZF's.
L98/LT1 Early production-'90 to about '92 - Square-cut gears. Noisey and stronger.
ZR1 Early production thru about '92 - Same square-cut gears. Shorter input shaft.
LT1/LT4 Late Production '93 - '96 Change of the angles on gears to quiet down the growl - not as strong.
ZR1 Late production '93 thru final production - same gears as above but with shorter input shaft.
[Modified by Joe90, 9:00 AM 8/31/2001]
L98/LT1 Early production-'90 to about '92 - Square-cut gears. Noisey and stronger.
ZR1 Early production thru about '92 - Same square-cut gears. Shorter input shaft.
LT1/LT4 Late Production '93 - '96 Change of the angles on gears to quiet down the growl - not as strong.
ZR1 Late production '93 thru final production - same gears as above but with shorter input shaft.
[Modified by Joe90, 9:00 AM 8/31/2001]
Team Owner
Joined: Mar 1999
Posts: 89,144
Likes: 3
From: Life's tough, wear a helmet.
Re: ZF Question (Joe90)
There are, indeed, 4 different designs for the ZF6. I'm not sure on when they made the change, but there is a difference. The internals are identical between the ZR1 ZF's and the standard ZF's.
L98/LT1 Early production-'90 to about '92 - Square-cut gears. Noisey and stronger.
ZR1 Early production thru about '92 - Same square-cut gears. Shorter input shaft.
LT1/LT4 Late Production '93 - '96 Change of the angles on gears to quiet down the growl - not as strong.
ZR1 Late production '93 thru final production - same gears as above but with shorter input shaft.
[Modified by Joe90, 9:00 AM 8/31/2001]
L98/LT1 Early production-'90 to about '92 - Square-cut gears. Noisey and stronger.
ZR1 Early production thru about '92 - Same square-cut gears. Shorter input shaft.
LT1/LT4 Late Production '93 - '96 Change of the angles on gears to quiet down the growl - not as strong.
ZR1 Late production '93 thru final production - same gears as above but with shorter input shaft.
[Modified by Joe90, 9:00 AM 8/31/2001]
So I've got a strong but noisy ZF.
