Question for you LT1 guys....
There possibly is a Z28 out there with the GU5 (3.23) and the lower MPH cluster, which means it did not come with Z rated tires.
Anything is possible. Not very probable that a performance axle ratio did not come with Z rated tires however.
All cars with 2.73 gears have the 1st gear lockout.
All cars with Z rated tires have the 155 mph speedo


