Axles and Ratios

[gauder]

Got this from the Petersen's 4wheel and offroad booklet, so don't kill me if it isn't accurate

Year........Model..........Front End......Rear End........Available Ratios
73-74.......K10............D44..............12bolt...........3.73, 4.10
75-76.......K10............D44..............12 bolt..........3.07, 3.73, 4.10
77-79.......K10............D44 or 10b.....12 bolt..........2.76, 3.07, 3.73
80-82.......K10............10 bolt..........12 or 10bolt...2.76, 3.07, 3.42, 3.73
83-87.......K/V10.........10 bolt..........10 bolt..........2.56, 2.76, 3.07, 3.42,
......................................................................3.73
73-76.......K20............D44..............10.5" 14bolt....4.10, 4.56
77-79.......K20............D44 or 10b.....10.5" 14bolt....4.10, 4.56
80-87.......K20............10b...............10.5" 14b.......4.10, 4.56
83-87.......K/V20.........10b...............9.25" 14b.......3.23, 3.42, 3.73, 4.10
77-87.......K/V20.........D60...............14 bolt..........4.10, 4.56
77-87.......K/V30 dualie..D60.............D70...............4.10,4.56
...............Crew Cab

 

[pauly383]

If you look at the original literature for each model year , you can see what ratios and drivetrain you could order . Of course any GM high up GM employee could bend the rules with a central office production order .

And 3.07 was available from 69-76 as well , which is a great ratio ONLY if you have dual low geared transfercases and a shorter tire

http://brochures.slosh.com/ go there and look at the dealer books . I bet it would of been cool to order one from the dealer in the old days .