Hey guys so Saturday morning I went to a buddies house to change the tcase fluids. Truck has 167k on it and seems like it's never been serviced because the atf was black and thin. I reserviced it through the speed sensor hole with 3 qts of 5w30 mobile 1 synthetic. Went to leave and the truck pops out of gear as I pull on the road and message pops up saying shift range inhibited. It goes into drive and reverse just fine but as soon as I get going it won't shift out of 1st gear, spedo doesn't register and soon get the same message and pops out of gear. I replaced the VSS this morning and no luck. Same issues. I tried driving around the back roads slowly to try and get the mil to appear but nothing. No codes. Then I pull the connector for the pass though connector on the passangerside of the trans and the connector is wet with atf. I blew it out with electronics cleaner and put in a little dielectric grease to isolate the pins from the fluid seeping through and still same results. I cleaned the connections on the tcm also. Since I bought the truck the abs light has been on, code says front left and right circuit fail.
Allison 5sp: Shift range inhibit after tcase service
- Thread starter TimmyLLY
- Start date
Mike is that the sensor on the tcase where I fill from? It's plugged in for sure, I replaced it with a new one this morning. I read the resistance across both sensors and they were the same so I don't think it's the sensor. I have turned on the truck, drive it for a little down the road and shut it off repeatedly to try and get a code to pop but nothing my cheap reader will give me. I'll have a V2 soon so I can get more info.
That speed sensor has a 12" pig tail or so mounted near the transmission and transfer case flange...it has a connection point there also...check that out real good I've had them corrode inside the coating of the wiring ..you may have disturbed this when you unplugged it.
After you drained it why didnt you use the cheap plastic oil pumper from vato zone and check fill level from the weep hole? Glw repair....
So I found the issue, I unclipped the pigtail and pulled the conduit off. The previous owner must have "repaired" the pig tail because I found the male connector for the vss wasn't the original connector. They used butt connectors but didn't heat shrink the repair and it became corroded and disconnected itself when I tucked the pigtail up and out of the way. Thanks for the help