[Tinker]

Anybody know what the spline count is for a 62 3rd member? I've got a 45 FF with 3.70s & 30 splines on the axles, & the prospective buyer wants 4.11s to match the front in his 40. All I can come up with is to take the 3rd out of the 62 front I have, but don't know if it would match up to the axles.

If the 62 3rd will match the 45 axles, can I put the 45 rear 3rd in the 62 front? (planning on new gears & bearings anyway).

[RredFJ40]

Must be a '78 or later 45? FJ62 axles had 30 splines also. The difference might be in the pinion splines (you might not be able to use the 40 series pinion flange on the diff if the 40 that it is going into is 77 or earlier). I don't know if I explained that well enough.