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secondchance · 09-18-2023

My understanding is the early Zs' black label ZF6s have higher torque rating but some of these transmissions (if not all) can be noisy at low speed. Later blue label ZF6s are quieter. I do not know when the change occurred (perhaps concurrent with 375hp to 405hp in 93?).
My 91 had a black label and 94 has a blue label.

09-18-2023	#3
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,704	Re: Blue/Black ZF6 labels My understanding is the early Zs' black label ZF6s have higher torque rating but some of these transmissions (if not all) can be noisy at low speed. Later blue label ZF6s are quieter. I do not know when the change occurred (perhaps concurrent with 375hp to 405hp in 93?). My 91 had a black label and 94 has a blue label.