[oletrucks] Jumping out of gear

["Joe Clark" <jclark1@utk.edu>]

All:
My 3-speed tranny ('50) jumps out of 3rd sometimes, usually when 
coasting.  Any suggestions on how to correct the problem?  I 
believe my synchro drum is good and the gears seem to be in good 
condition too.  However, I fabricated this tranny by interchanging 
parts from another one (main spline, synchros, etc.).  Thanks for 
any suggestions.
Joe
Joe Clark
'50 3100 Deluxe
Knoxville, Tennessee
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959