Quote:
Originally Posted by joedoh
the4l60 in 1991 is not electronic (except the speedo) so there is a kickdown cable on the tbi and a lockup switch that i think runs through your brake wiring. no issues switching it to any other trans EXCEPT a 4l60e, you dont have the controller with your stuff.
needing overdrive is really about your rear gear. if you have a numerically low gear a th350 or th400 will do fine. also, look at your tire size, bigger tires lower gear ratio.
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Both front and rear diffs have 11:41-3.73 gears. Currently have 31in tires, 17in rims. Hopefully this 1991 350 motor will be strong enough 🤟🏻