Quote:
Originally Posted by MJN
As it was stated above the best you can do for that rear axle is 4.10's. Standard gear ratio for these was 4.56- thats most likely what you have. If you want to confirm there are numbers stamped on a flat area of the third member above the pinion or you can pull the cover and count the gear teeth.
Besides an overdrive unit or 5-speed transmission is to swap the rear axle out and that would either require fabrication to make a 14-bolt (they can be found with 3.73's) work with your coil springs or trying to find a Dana 60 from a coil spring truck that would bolt in and having a different gear ratio ring and pinion installed to get the ratio you want.
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Though not the most common ratio, in the 80’s the 14 bolt full floater could be had in 3:42 gears. That would be a nice improvement if you run a lot of Highway miles. You will need to strip the housing of all its original leaf spring brackets and re weld the trailing arm stuff back on as well as a track bar mount, but totally doable.