ZR-1 Net Registry Forums - View Single Post - 1992 ZR-1

tccrab · 11-12-2024

For the most part the ZF6 is a really great transmission.
There are many out there still going strong after 30+ years.
They can handle ungodly amounts of HP and Torque.
They may not be a M22 Rockcrusher, but they are in the same league.
They do have a few tiny weak spots.
Speed shifting and missing gears can and do wipe out syncromesh gear teeth. Don't ask me how i know this. What I will tell you is that its expensive to fix after you've done it.
And then there's an issue of "mis-use" of 6th gear.
Let's say you have a burning desire to see close to 200mph.
You'd best not make the attempt in 6th gear. Wind it up to 7500 rpm in 5th, but don't do the same in 6th on an unmodified ZF6.
There's an internal oiling issue that will bite you very hard. 6th was designed to maximize MPG at freeway speeds, not set records at the Salt Flats.
Good news is that Bill B. "The ZFDoc" at ZR51 Performance has the answers for these issues.

So, test drive the car.
Bang through 1st, 2nd and 3rd.
No need to hit the rev limiter, but exercise the gears.
If it shifts smooth and firm, you probably wont need the ZFDoc.
You're still going to buy the car.
It's a ZR-1 after all.

Once you've discovered permagrin, you are hooked.

11-12-2024	#4
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,663	Re: 1992 ZR1 - Transmission questions For the most part the ZF6 is a really great transmission. There are many out there still going strong after 30+ years. They can handle ungodly amounts of HP and Torque. They may not be a M22 Rockcrusher, but they are in the same league. They do have a few tiny weak spots. Speed shifting and missing gears can and do wipe out syncromesh gear teeth. Don't ask me how i know this. What I will tell you is that its expensive to fix after you've done it. And then there's an issue of "mis-use" of 6th gear. Let's say you have a burning desire to see close to 200mph. You'd best not make the attempt in 6th gear. Wind it up to 7500 rpm in 5th, but don't do the same in 6th on an unmodified ZF6. There's an internal oiling issue that will bite you very hard. 6th was designed to maximize MPG at freeway speeds, not set records at the Salt Flats. Good news is that Bill B. "The ZFDoc" at ZR51 Performance has the answers for these issues. So, test drive the car. Bang through 1st, 2nd and 3rd. No need to hit the rev limiter, but exercise the gears. If it shifts smooth and firm, you probably wont need the ZFDoc. You're still going to buy the car. It's a ZR-1 after all. Once you've discovered permagrin, you are hooked.