[SierraDan]

I recently put 3.9 NT centres into my diffs, and came across some differences that some people werent aware of when i told them.

One WT flange i had went onto the NT 3.9 pinion without a fuss.
And all others i had including the ones from my original 3.7 centres wouldnt go on.

The NT pinions and flanges had more of a triangle shaped spline.
and the WT flanges that wouldnt go on had more of a square shaped spline.

So does anybody know what WT models have the triangular spline and which ones have the squared ones?

[want33s]

No idea which is which but I have had a few WT flanges that were a real bitch to fit to NT pinions.

[christover1]

I have the yoke? that came with my 4:3 steel gv front, it won't fit anything I got. I kept it in case purchaser of the 4:3 suddenly found they may need it.

[SierraDan]

Yeah I thought they were just a real bitch to get on, but mnemonic noticed when he was helping me figure it out that the splines have the same count just a different shape.

I was thinking the one that worked may have been a 88.5 one. NT spline but WT bolt pattern?