[jwalker1970]

update on erratic speedometer & ABS & brake light.....

I unhooked the sensor, cleaned the connections to the sensor, same problem.

I tapped into the two green wires going to the sensor and sent a 1350 hertz A/C signal (via an antique oscillator--- wave generator). I verified that my speedo held a constant speed at about 60 Mph, no fluxuations what so ever. Therefore my wiring must be good to the PCM / speedo control module.

I pulled out the sensor to find a massive amount of metallic "fuzzy" stuck to the magnet. I dropped the cover (9.25" 3.92 trac-loc differential) to find my clutch packs disintegrated, and my spider gears chewed up. There was chunks of metal stuck in the teeth of the exciter ring on the ring gear. (would explain an erratic signal)

I called the local salvage yards, found that they had a problem with the lock-up differentials.

I was told by the rebuilder that they're a B*tch to get the clutch packs into place, and even an experienced mechanic would have a tough time without the proper specialty tools.