They are not hard to rebuild as far as transmissions go. You will need agood set of snap ring pliers & a press. Changing to a 4 speed does not change the final drive ratio & would be more work changing the floor plate. If the noise in in the lower gears & is quiter in high it probably is brg. noise. You can put ring & pinion gears from a 50-54 pass.car with powerglide in the rear end to get better highway driving.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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