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so what size gears would you recommend for his set-up? just curious. I have about the same setup and would also like to improve my perf

If not planning on running any tires larger than 32's, 4.88's would be the right set of gears. The 4.56 gears is the oem size for 31's and a 5-spd, though w/32's and a 4cyl. the 4.88's would be a better option.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed