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Ok the 10 bolt(eaton) that would be in your truck is not the same as the corperate 10 bolt. Your 10 bolt has a round cover and drop out center section refered to by RPO numbers: H052 and H072. The 12 bolt was in 1/2 ton trucks. 14 bolt was introduced in 1973 not available in our trucks, though a 1 ton 14 bff will bolt in and only require moving the shock mounts. Forgot some dana 60 rears made it under the rear of some 3/4 ton 4wd trucks mostly the GMCs.
The spicer hub you need is not made anymore, it's an external hub. Everything now are internal. Post a wtb on the parts board, the dials came in 3 different covers blue(our trucks), yellow and red(ferd).
Performance, where to begin..... The highest gears for an eaton(our axle) is 4.10, only traction aid is a, not made anymore, detroit locker refered to as the no-spin on the option sheet. That's it.
You'd have more option with a newer axle.
Our front (dana44) w/ 8 lugs was the biggest available until 1977 w/ the 1 ton 4wds came w/ a dana 60. Comparision 8.5" ring gear to 9.75" ring gear. Axle are 40% bigger, u-joint are over 100% stronger. W/ a dana 60 front you can run 44" tires. max recommended for a dana44 w/ the 260x u-joint is 33" and w/ a 297 35". I stop here allow others to jump in.
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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 
Last edited by JIMs70GMC; 01-20-2005 at 09:18 PM.
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