The 4T60 is available in many different sprocket/sprocket and final drive ratios. Look for 35/35 and 3.33 for best results in a Fiero. 88 - A body Chevy with 2.8 88 - W body Chevy with 2.8 89 - E & K body Caddy with 4.5 89 - H body Buick with 3800 89 - A & W body Chevy with 2.8 90 - Caddies as above 90 - W body Pontiacs with 3.1 or 3.1 turbo 90 - Buick as above 90 - A body Pontiacs with 3.1 91 - All 91
