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  1. C

    Make it make sense...

    I have a 1998 C3500 with a 4l80e, 4.10 and 245/75/16 tires. Now with all that when I'm cruising at 3000 rpms I should be going about 88mph right?! No I'm going 70mph. I have verified that I am in 4th gear and the torque converter is in lockup. I'm 100% positive I have 4.10 gears. My...
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