Numbers on Rear End Housing
 

I have a 65 GTO clone which started out as a LeMans. It has a different engine & different transmission than it did from the factory. I'm trying to find out the ratio for the rear end but the serial numbers are not where they are supposed to be, they are actually on the engine side of the rear end. The numbers stamped on there are LK BO11-1 (could be LK B011-1). This may not even be a Pontiac rear end.


Any assistance with these numbers would help.


Thank you
Skeeter57

Welcome to PontiacTalk, A 65 automatic came standard with 3:23.
All of these ar good choices- 2.56,2.78, 2.93, and the 3:23.

Rear Axel Codes
 

A two letter code is stamped on the back passenger side of the axle tube, It identifies the axle ratio.