My '62 olds f85 (215 aluminum motor) has a glitch in the 3-speed manual transmission What other trannys will fit this (Buick Special, Buick Skylark, '63 Cutlass, etc)? Or, where can I get parts for it if taken apart to rebuild? Thanks for any help

 

The 61 thru 63 F-85 three speed transmission was a Borg-Warner T-96 unit.
You are correct that this same trans was also used in 61 thru 63 Buick Specials & Skylarks.
Some Ford, Studebaker, Nash, and Mopar transmissions also shared some of it's internal components.
But not the case or main drive gear, those were GM only.

Try Northwest Transmission Parts for individual parts;
Northwest Transmission Parts (nwtparts.com)
Probably best to call them, their website leaves a lot to be desired.