mike16889 wrote:the more i look the more it looks like my old box will be 3.9. if it is is it possible/easy to swap the front diffs?
3.9 is a 39 tooth Crown Wheel and a 10 tooth pinion gear
4.111 is a 37 tooth Crown Wheel and a 9 tooth pinion gear
So Both Crown Wheel and Pinion need to be changed.
The pinion gear is threaded though the centre of the Driven shaft.
The complete drive pinion shaft assembly needs to be removed from the gearbox.
Sounds big to me?
Look at the manuals you have been directed to. Cheers!