Thread: Replaceing Pinion Flange on rear diff.

I have found a rear diff from a D1, it has the regular 4 bolt pinion flange. It seems easy enough to remove this and replace it with a factory 3 bolt pinion flange, which will come out of the old diff. Is this easyish or am I missing something? I plan on using a bearing puller to pull the flange out. I guess that the splines are the same on both types.

IIRC there is an M8 thread in the spigot.
Use 3 bolts.

A flat plate of steel of some kind(or angle or whatever you have access too) drill three holes in the steel plate to line up with two on the yolk and one for the spigot. Size dont' matter, as long as you can get them to line up.

2 long-ish bolts in two of the the yolk bolt holes with nuts to hold the plate forward a few cm from the nose of the spigot. So in effect you need two bolts and 4 nuts. 2 nuts hold it at the yolk and 2 nuts at the plate to stop it sliding back.

The idea is that the M8 bolt is wound into the spigot, and if the plate is held forward it pulls the spigot out as you turn it(no nuts on it). Just thread it into the spigot.
I think the spigot has about 50mm of thread.

Those spigots can get stuck in good and firm. I tried the slide hammer on my spare parts D2 and no way it would move. I had to use two angle bars, where only using 1 bent in too much.

On the D1 and D2 where I changed donut and spigots and internal bushes and stuff, they came out more easily just with this 6mm flat bar I used.