Quote:
Originally Posted by Fred T
The pumpkin comes out by pulling out the axles and removing the ten housing bolts on the front. The only difference in the housings between the 3/4 and 1 ton is the housing width and brakes. Don't disassemble the carrier unless you know how to adjust the gear lash, the pumpkin swap is the way to go.
In the 10 bolt full floater, the best gears you will find are 4.10. There were a few with 3.73 and 3.90, but I have only heard of one confirmed find. Very rare. There were also 4.57 and 5.1x.
I have read on this site that a 14 bolt pumpkin can be used in a 10 bolt housing, but you need to find the right axle length as the 14 bolt uses a different count spline. You might try searching.
I would use a 14 bolt rear. 3.73 gears are an easy score, I have even seen some with 3.42s.
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The 14 bolt does not have a "pumpkin" like an Eaton. You can swap the No-Spin back and forth between the carriers, or the side gears, but I do not think a carrier will fit. Even if it did, you would run into a number of problems, like fitting the pinion gear in the housing, and you'd have to set the gears again, anyway.
The 3.90 was aftermarket and pretty uncommon because they were very pricy, 4.11 is the highest you can go from the factory.
Swapping chunks is easy, but it'll probably be a mess with all the gear oil. take a couple of the lower bolts out and let the diff drain (they are through holes, not blind) THe 3rds are also heavy, around 135 lbs, so prepare in advance for that if you aren't the incredible hulk, lol.