Hello. I've got a 300TD wagon that has a whinning diff. I believe the diff is specific to the wagon and the 85 year with a 2.88 ratio or thereabouts.
Can I swap another diff like the 85 sedan diff with a 3.?? ration in it's place? and Will it be a direct fit? My 85 sedan has the 3.?? ratio with the same engine as the 85 wagon, so I'm wondering why I need the 2.88 diff.(the whinning one). I don't want to have it come apart on me on a trip somewhere and have another diff from a gas car (1982) same ratio as the sedan (3.??) Pardon my ?? for the ratio. I think it's really a 3.4something.

Any help would be greatly appreciated.
Mike