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I recently replaced a slipping transmission. The new transmission is starting in a low gear and when driving won’t shift past that gear. Stabltrack light indicator is on dash also the light for indicating what gear the truck is in is not on. Any suggestions?
 

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2004 Sierra 3500 6.0L, auto, extended cab, cab&chassis, upgraded to 4wd
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-check that the electrical connections to the transmission are still clean, fully inserted and the wiring harness wasn't pinched/damaged during R&R
-check that the physical lever on the transmision is moving w the shift lever in the cab
-check for TCM codes. You will need a better than basic code reader to do this. If this is a truck you plan on keeping & working on/diagnosing yourself, I would recommend a knock-off techii or mdi unit w tech2win(needs a windows laptop), to get codes from all the computers in the truck, as well as perform all diagnostic and reprogramming tasks.
 
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