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Want to fit aftermarket gears in your factory 4.875 diff housing? You can’t and here’s why.
The factory 4.875 diff centre uses a thinner ring gear than the other OEM ratio’s and to accomodate this Toyota made a different housing that offset the pinion closer to the centre of the diff.
The aftermarket made all of their ratio’s the same thickness as the other non 4.875 ratio’s, so the ring gear is thicker and will not fit in the factory 4.875 housing. The only gear that will go in one of these factory 4.875 housings is the thin factory 4.875 ring gear.
If you check out the photo above you can see the difference between the two. On the left is the factory 4.3 and on the right is the factory 4.875. Note that the pinion hole is offset to the centre on the factory 4.875.
So bottom line is if you have the factory 4.875 and bust a ring and pinion you will need a new centre if you want to fit aftermarket 4.88’s.
