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it's either 4.10s are 4.56s. What size tires are you running. I have 4.10s w/33" tires and turn about 2850RPM @ 65mph. What rear axle do you have? You could be limited in what ratios are available. Big round cover = no better than 4.10s stock. dana60s came w/3.54 gears I believe. You could try and find a leaf sprung truck w/ a dana 60 and the higher gears. Don't forget to change the front to match.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs
1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.
1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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