Join Date: Nov 2010
Location: Yuba City, ca
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Sounds like you have multiple problems, some may be related and some are not. There are two speed sensors, on on the trani and one on the rear diff. The one on the rear diff is the one that runs the speedometer. The one on the trani is related to shifting, but usually down shifting. The on on the diff is for the speedo and some computers. On the one on the diff check the plug and wires before replacing the sensor. The 1688 show a bad VP and should reflect in running, power and starting, not shifting. Does it have any running, power or starting issues? It is possible that all problems are real and separate or possibly related. Start with the small stuff first and work your way up if it runs well.
99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels.3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 603k miles.