are the 4.11 and 5.29 ring gears the same diameter i know some on some diffs the ring gear gets ever so slightly larger (planing on shaving the housing need to be shure if i change gears later that they will fit)

also are the front and rear diffs interchangable (same spline count on side gears) I know the rest should be

the 5.29's are a thicker than the 4.10's but OD wise, if there is a difference it sure can't be much because otherwise it wouldn't fit through the ring in the front of the housing...

and yea they swap front to back..

Not trying to hijack the thread, but what on average do used stock sammie 3rd's cost if in good condition? I'm still on the same topic here.:D

yes...they are interchangable and no clearancing for 529 gears....now if you go to 571 then yes you have to touch it with the grinder. Been there.

Here in Okie land Sammi chuncks go for $75.00.