If you are getting 5 volts on your signal wire at idle the TPS has a dead short. 5 volt power is going straight back through the signal wire - not good. You can take it apart as per some of the threads on this but I think you may be in for a new. The OD and lockup problems will certainly be caused by a TPS reading like that.

 

well, I took my TPS apart and cleaned its little corroded contacs and dumped the mud and sand out of it, hopefully it will work now, but if I was to test the wires coming out of the TPS with out them being plugged into it, should the purple and the orange wire still be at 5V? cause they are. is there a short in my PCM possibly?

 

The signal wire should have 0 volts without the TPS plugged in and the power wire should have 5 volts. I'm honestly not sure why the sig wire has ANY voltage without the TPS plugged in.
Perhaps a short in the harness between the two wires? - Not certain, but I doubt it is the PCM. It appears the only way to be sure may be to find the wires at the PCM and cut the sig wire and check for power at either end of your cut - that will tell where the 5 volts on the sig wire is coming from.

Keep us posted. Hopefully others will chime in with some suggestions here.

 

well I cut the orange/blue wire and the PCM is putting out 5 volts on that wire, so I guess I need a new one, anyone have one they wanna sell for a 95?

 

i'm having the same problem! i've only had the truck for 3 days now and it's just down right depressing. I was so excited to get this truck 96' 2500HD Diesel, and now unless i have a hill to get my speed up to 66mph it won't go any faster. As soon as i can get to 66 though i'm skyrocketing down the highway until i get to slower traffic which starts the whole cycle over again. I recalibrated the tps yesterday, i removed about 2 ft of the wiring from the harness and wrapped it with aluminum foil and retaped it. cleaned the connector with contact spray, added a 470uf capacitor between the orange wire+ and the black wire-. i pulled 3 electrical connectors from the tranny sprayed them and put dielectric grease on them and the tranny still won't shift into od until i hit 66!!! please someone help me!

 

Have you tested the TPS voltage yet?..........don't do anything else until you can confirm the voltage from the signal wire is between .8 - 1.2 volts a little higher is ok, 1.8 tops.

 

I changed my TPS and it fixed some of my problems but I still can't get it to shift out of first gear on its own.

 

aren't there some bands in the transmission that control the 1-2 and 2-3 shifts? they most likely need to be adjusted, IMO in your case.

 

wow you broght this one up from the dead. I did end up figuring out why it wouldn't shift into 2nd, I pulled the pan to change the fluid one day and found a funny looking metal thing in there. it ended up being the lever that sits between the 2nd gear band and the servo. put it back in and it works grrrrrrrrrrrreeeeat! except for the slippage haha.