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Re: Granny geared 71' K10, I need to go faster...
 is me . . . I mixed info I guess. 
he needs to pull a cover and find out what he has and we can help 10x better there.
just for kicks tho .
3.08
31" tire @ 70
no o/d = 2337 rpm
o/d swap = 1753 rpm
33" no o/d = 2195 rpm
33" o/d = 1646 rpm
3.42
31" tire @ 70
no o/d = 2595 rpm
o/d swap = 1946 rpm
33" no o/d = 2438 rpm
33" o/d = 1828
3.73
31" tire @ 70
no o/d = 2830 rpm
o/d swap = 2122 rpm
33" no o/d = 2658 rpm
33" o/d = 1994 rpm
keep in mind were is your power curve on your engine . to low a rpm can hurt as the motor dosnt work as easy as in the sweet spot.
and if you don't have a tach get one . you will be surprised what rpm you are turning to what you think you are . . . sounds are miss leading in this department and worse with non stock style muffler.
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77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
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HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .
EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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