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Differential and Gears Upgrade. - PCM Update - Slideshow View

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PCM Update
A used PCM was sent for re-programming by PCMFORLESS.COM. They changed timing advance, shift points, corrected speedo for new gears, changed the radiator fan high/low on/off temps for 180* thermostat, and a few other performance changes.

The PCM I had reprogrammed came from another car, so a procedure called Case Learn was done by a GM dealer to reset the cranck shaft timing variation unique to each engine.

The new PCM and programming worked great. And most importantly, the speedometer is now correct with the 3.73 gears.
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