Hey there, my 1960 rear end is finally discovered after hours of scrubbing off 42 years of grease and grime. The code on there is MA, I looked in my assembley manual and found that that rear end is the 3.90(no positraction) rear end used through 63 in the C10. I have a 3 spd tranny and a 350 chevy small block. Will I be able to go high way speeds in this or not? If not can I just replace the ring and pinion with lower gear ratio or higher not sure on that one. Please any help would be appreciated.
Good News- Yes, you can get to highway speeds.. Bad News- Your motor woll be doing about 3200 RPMs to get there. I'm not sure on how high a ratio is available for that rear. I would try to get higher than 3:70 for freeway cruising without taching the RPM range above 2500.
