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Re: Changing the ring and pinion going to create drama?
The VSS signal is folded spindled and mutilated by the PCM and the PCM feeds the results to the instrument cluster over the serial databuss.
He will have to change the PCM and ABS computer calibration to match the tires and axle ratio.
I know you can change the tire size in the ABS computer with a Tech 2 I'm not sure if you can change the axle ratio with the Tech 2 or if you have to get a new calibration from GM.
HP Tuners or something similar is needed to mod the tire size and axle ratio in the PCM.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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