Im selling my pair of freshly rebuilt diffs.
3.9 ratios,

Just had a full overhaul, vapour blasted casings, new bearings, seals, spacers, shims, new crown wheel and pinion, strengthening plate in the front diff etc etc

Not done a mile, sat on the shelf £400 delivered the pair

 

If you get a buyer on the rear I may be interested in the front one

 

Can the ratio be changed on the front diff, i thought you had to step the gearbox to suit? normal front diffs are 3.6

 

Only if you dont change the front diff you use a drop gear in the box which is the better option as the crown wheel in the front diff is the weak link

 

3.9 diffs were used as standard in the DOHC 4x4 cars, physically a straight swap into a Sapph Cos 4x4.

 

Does that make the 3.9 fron diff weaker than the 3.6 cosworth item?

 

Yes thats right