I searched hi and lo for a cheap Throttle Position Switch. Everything I read was pointing me in that direction. I talked to a guy that told me to cut the Ground connection harness out and make a direct splice before I do anything.
OK! The part I am talking about is for my 1998 1/2 Dodge Cummins 24v (8th number in V.I.N. is 6) 3/4 ton Quad cab. It is located on the passengers side battery tray. Look at the (Black) Ground cable comming off of the battery- there are 3 wires ranging in gauge. One is the battery cable which drops down below the engine, one mounts to the engine compartment and the last one jumps to the alternator with problem connector. It is mounted to the battery tray with 2 plastic push clips. I was told to cut out the connector and make a direct splice. I opted to pull the harness apart first and work to insure a good connection. PROBLEM FIXED! Took 5 minutes if that.... My truck had been shifting in and out of overdrive between 43 and 48 mph for months and started getting worse lately around 50mph. From what the "Stealership" told me, that connection has something to do with the Ground to the tranny to lock up the torque converter. Hope this helps someone. Saved me hundreds of dollars. Try it first! FREE and SIMPLE........ Good Luck!