Re: 85 k-20 Drivetrain
also if you wanted to you can compare the sm465 and the nv 4500 against each other at this site http://www.grimmjeeper.com/gears.html and you can see what your truck will be running at different rpms and speeds.
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R.I.P gm 1908-1986 
1982 chevy k20,350,sm465,np205,10bolt and 14bolt s.f
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