<,4.5 or 3.5 will the gears from a w109 6.3 with 2.82 ratio fit?
>

Any gearset for the diff. case with the oil cooler tube should interchange.
As any without should interchange.
But none will interchange from cooler/no cooler tube casings.
The no cooler diff is too small for gearsets from the cooler models.

I have never done the 2:82 , but it is from a cooler case, so I do not see any problem putting them in a 4.5 case.

__________________
A Dalton