Recent content by clthorn

  1. C

    Make it make sense...

    So I had a friend come over with a scanner and I never in a million years would have thought both my speedo and tach were wrong. Going 70mph using the scanner my speedo reads 88mph. Turning 3000rpm using my tach, the scanner reads 2450 rpm.
  2. 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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