Diff Flanges and Tail Shafts

[NzCommyMan]

Abit stuck, I've got a 2004 Vy Commodore Exec s2 auto 3.8l V6. I've just bought a second hand LSD out of a 2004 Vy Commodore, my understanding was they are all interchangeable which I've found out isn't true. I've only just realized that the diff flange on the LSD is a 6 bolt and the tail shaft is a 3 bolt.

My question is, is it easier/cheaper to do the following:

A. Change out the diff flange on the lsd to a 3 bolt?

B. Change the tailshaft to a second hand 6 bolt. If so what tailshaft would work and would it take any modifications?

C. Just take the loss and get a whole new 3 bolt LSD?

 

[_R_J_K_]

I've only just realized that the diff flange on the LSD is a 6 bolt and the tail shaft is a 3 bolt.

Pictures of the flange?

 

[NzCommyMan]

Pictures of the flange?

First one is the open diff (3bolt)second picture is the lsd(6 bolt)

 

[Immortality]

The 2nd one is from an earlier model. VY uses the 3 bolt style for both the V6 and V8 models. The 6 bolt flange was the style of coupling used up until VX V6 which was the change over model.

 

[ephect]

You could mate a vx rear half and vy front half tailshafts to make this work with the earlier diff. Might as well replace the centre bearing and cv for piece of mind

 

[harrop.senator]

Or just find a VT tailshaft to suit and get rid of the donuts.

But if same ratio I'd look for a 3 bolt manual V8 lsd at 3.46 ratio and re set the Speedo.