How may RPMs we talking here? I've got a '70 GMC C2500 pickup 350 V8 with 4.10 rear axle. Does it sound like its screaming at 55 after driving my outher rigs (all with overdirves & higher gears)? Yes it does but it will run under load at 75 all day long.
Is this a 'burb a K10 or K20? Does it have a manual transmission now? Might still have ratio tag on front axle cover bolt.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022