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thanks for the replys.

well one thing i forgot to mention is this beast is a 4x4 and to be honest i have never looked at the connection from the output shaft to the transfer case. it donned on me today that this may be my biggest challenge. because of possible differing lengths of transmissions and if there is a drive shaft or not going to the transfer case, it may just be a direct connection at the transfer case. which i really really need and want to keep because its also where the PTO power comes from for the dump bed and the 12,000lb winch up front. and because I'm 1000 miles away i cant get any pictures of it or take a look myself. i could possibly get my dad to do it but hes busy most of the time.

also we need to keep in mind that both my front and rear differentials are 6.67:1 and my stock trans gears are.

1st: 7.06:1
2nd: 3.48:1
3rd: 1.71:1
4th: 1:1

also what is this Gear Vendors over drive? sounds like the ticket for me.

*Edit*

i just did a little bit of reading for the SM420 and i think it might be the best choice already, but i would need a taller 4th gear or possibly an over drive because its gears are basically the same as what i have now.