I have recently bought a used Powerglide ('67 Bel Air). How can I figure out the gear ratio? Is there some information on the transmission?

Best Regards,



I have a "built" glide in my small block powered '65 Nova. Ever since having the glide freshened up in the middle of the year, it wants to creep when you snap the throttle in park or neutral. What is the reason for this and how can it be solved? We'll be picking up a new comp glide from you this winter and this current glide will be our "backup" piece. Thanks for building good parts and for providing good tech support.

Greg M.
Sacramento, CA


The aluminum Powerglide from GM was built from 1962-1973. They were set up with two low gear rations; the 4-6 cylinder engines usually had the lighter, weaker 1.82 ratio stamped steel housing planetary. The V-8's were equipped with the 1.76 ratio cast housing planetary, which was much larger and stronger. Lucky for us the GM engineers over-built these parts, and the 1.76 is used in a lot of race applications. Stanley, without disassembling the trans you can usually identify the planet by the length of the input shaft. The 1.82 planet takes a 12 5/8" long input shaft and the 1.76 planet takes a 12 7/8" long input shaft. As long as it hasn't been swapped it can tip you off. If not you would have to disassemble the trans.





This gyro effect that you're experiencing is very common on a racing automatic, but especially on a Powerglide. You see, what is happening is in park and neutral the direct drum spins free over driven planetary gears, so when you whack the throttle hard it spins up and sort of makes the car lunge but really doesn't move the car. The reason that we notice it more here than in a stock engine setup is the race engine revs so much quicker, so Greg, usually this is a non-problem.




To contact Mike Stewart email trannytech@dragracingonline.com


Previous Story
Tranny Tech — 1/9/04

Cover | Table of Contents | DROstore | Classifieds | Archive | Contact
Copyright 1999-2004, Drag Racing Online and Racing Net Source