you sure you wouldn't want a 700r4 or a 5 speed? overdrive is so worth it
you shouldn't hurt the s10 gears unless you are going really nuts with the full throttle launches and even then they are stronger than you would think.
a explorer 8.8 can be had with 3.73 gears, lsd and disc brakes really easily at the junk yard, and the first 3" or narrowing comes pretty easy, beyond that takes some more time and money like with anything you want to narrow.
do some research on the different rears used in the s10 there were a few variations
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