Okay thanks. I was thinking about the 5.285 ring gears... My brain was on a tangent... and then I mixed the t-case thread and the diff thread in my mind... surprise surprise...

So, the 2.85 T-case gears would be the only one's to fit my 91 3.0 5-speed?

Thanks for answering my questions.

1991 Montero LS 3.0 5-Spd LWB 31" Bridgestone Dueller ATs on stock rims, tan/tan interior/exterior
1986 Isuzu Trooper 2.3 5-spd - partially disassembled, tan interior/dark blue exterior