Forum Discussion
blt2ski
Jul 22, 2017Moderator
Ian,
My c2500 w 410 gears, 245 75-16 rubber does 2600 @60mph tc locked. 3000 unlocked in direct. Assuming you have 265-70-17 rubber, you should be about 300 or 600 r's below me depending on 3.73 or 3.42 gears.
I'm at 1800 in od final drive 3.08.
Also assuming you have a 4l80. 6l90 screws things up a bit. As 4th is a 105 or some such thing. Not direct.
My c2500 w 410 gears, 245 75-16 rubber does 2600 @60mph tc locked. 3000 unlocked in direct. Assuming you have 265-70-17 rubber, you should be about 300 or 600 r's below me depending on 3.73 or 3.42 gears.
I'm at 1800 in od final drive 3.08.
Also assuming you have a 4l80. 6l90 screws things up a bit. As 4th is a 105 or some such thing. Not direct.
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