got to ask

[bvectra]

what is difference in the blue label and black label zf6 transmission

[WARP TEN]

Originally Posted by bvectra

what is difference in the blue label and black label zf6 transmission

The black label trans which was used with engines through early 1993 car production had straighter cut gears and a bit more torque capacity as a result (450 ft. lbs. vs about 400 as I recall). It also had a bit more gear whine so was replaced with the blue label trans for the remainder of production. The blue label one was supposedly a little quieter although I have owned both and could not tell a difference. My 1993 serial number 161 had the black label trans and I think was one of the latest to have it, although there were probably others after it. I can't recall if there is a way to tell from the outside of the trans which is which.--Bob

[Dynomite]

I have a 91' ZF S6-40 Transmission (Black Label) Parts List No 1052-000-035 with a collar diameter of 1.373 inches and a 94'-95' ZF S6-40 Transmission (Blue Label) Parts List No 1052-000-087 with a collar diameter of 1.305 inches.

a. Here is a source for the 90'-93' ZR1/LT5 Throwout Bearing Power Torque Systems Throwout Bearing Part #: 23243
b. Here is a source for the 94'-95' ZR1/LT5 Throwout Bearing Power Torque Systems Throwout Bearing Part #: 23244
c. This is exactly what the Throwout Bearing looks like as cited above in both cases as the differences in internal diameter is not noticeable from a picture only.




See Throwout Bearings and Clutch Forks

Oh....forgot to mention.....the Blue Label does not require to pull up on shifter ring to get into reverse.

[We Gone]

93 #179 Still has a blacktag.

[efnfast]

Ram clutch doesn't know the black tag has a larger input shaft?

[Dynomite]

Originally Posted by efnfast

Ram clutch doesn't know the black tag has a larger input shaft?

I think only the throwout bearing knows
Pilot bearing and clutch/clutch fork do not know
Bell Housing does not care

I have a Blue Label on my 1991 ZR-1

And you will know when you shift into reverse with the Blue Label not requiring to lift the shift ring.

[Corvettes White]

Black Label $50.00.
Blue Label $200.00.
Black Label made in West Germany.
Blue Label made in United States (I recall.)
George