Volume X, Issue 1, Page 60


1/8/2008

How much horsepower is considered safe for a stock planatary gearset in a 1.76 powerglide?  I run a 3220# 65 Nova with 4.30 gears and 32" tires.

Greg
Sacramento

Greg,

The original 1.76 powerglide planetary gear was only designed for 400 or so horsepower. So keeping that in mind, we have had 3300 – 3400 lbs cars go in the 8.50s – 8.60s with stock 1.76 planetaries. What we have learned is that some sets are better then others; it’s like some batches had better steel or better heat treat, I am not sure. What I do know is when you reach a certain point, the stock OEM 1.76 is a time bomb. The question is not if it will break, it is how long till it breaks! The answer is anything beyond about 800 – 900 HP we need an aftermarket gear set. A set with big straight cut teeth and a forged output shaft carrier. Don’t buy the cheapest set you can find. The cheaper ones will pit and wear out way too soon. Buy a high quality set and you will be glad you did.

Mike

Mike’s Transmission
Lancaster CA
(661) 723-0081
www.mikestransmission.com

 

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