SuicidalTherapy
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1996 K2500HD 6.5 diesel. Was a daily driver until the injection pump failed. I pulled the trans to swap into my K5 temporarily, then went through and refreshed the trans when I put it back in the truck. Worked fine, but had 220K miles on it at that point and a few thousand behind a healthy 489BBC in the K5 as a full manual, and had a few minor leaks. Figured it was a good time to put new clutches and seals in it. Direct clutches had seen some heat, but no major issues seen.
Got it in the truck, and found it wouldn't shift out of 1st either automatically or manually shifting, not all of the dash gear indicators were lighting up, and speedometer wasn't working. All other gauges and tach are working. Cleaned the range switch connections, got all the gear indicators showing. Swapped the VSS in the transfer case with another from my parts truck, but still no speedo and no shifting.
My scanner is showing the trans input speed sensor to be reading correclty, but always getting a 0 RPM on the output speed sensor. Swapped that sensor, and same thing.
I don't recall there being a reluctor in the trans for the OSS, but the sensor is there and there's a plug in the harness for it. My understanding is the OSS is the VSS for 2WD trans, but the 4WD uses the VSS in the transfer, and typically there's a dummy plug in the 4WD units...but mine definitely has a sensor and mating connection for it.
Is this some GM oddity with these trucks, or did I goof bigtime in the rebuild and forgot a major part?
Got it in the truck, and found it wouldn't shift out of 1st either automatically or manually shifting, not all of the dash gear indicators were lighting up, and speedometer wasn't working. All other gauges and tach are working. Cleaned the range switch connections, got all the gear indicators showing. Swapped the VSS in the transfer case with another from my parts truck, but still no speedo and no shifting.
My scanner is showing the trans input speed sensor to be reading correclty, but always getting a 0 RPM on the output speed sensor. Swapped that sensor, and same thing.
I don't recall there being a reluctor in the trans for the OSS, but the sensor is there and there's a plug in the harness for it. My understanding is the OSS is the VSS for 2WD trans, but the 4WD uses the VSS in the transfer, and typically there's a dummy plug in the 4WD units...but mine definitely has a sensor and mating connection for it.
Is this some GM oddity with these trucks, or did I goof bigtime in the rebuild and forgot a major part?
