Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
Thanked 54 Times in 52 Posts
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I've heard that the dealer can re-program the computer for the tire size you're running... not sure how a chip will effect this, or if it would need to be removed to have the dealer do the programming.
Frog, you are correct, the speedo gets it's info from the sensor on the rear end, as you mentioned. The sensor going bad will cause erratic speedo readings, and shift issues, as the trans uses the speed info to shift correctly.
Good luck to both of you... I am in the same boat, my red truck wears 35's, and has no correction, I'm sure it's off, I've been lucky to not have gotten nailed for speeding. Also wonder how much it's thrown off my MPG calculations, I'd bet I'm getting better than what it calculates out to.
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
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E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k