My dad has a 2001 3500 with the 5 speed. After camping last weekend he went to move the truck and it seemed like it was stuck in 2 gears at once he said. Nothing he did made a difference until (and this is weird) he looked under the hood and found a relay marked trans something or other. He replaced that relay and the transmission began shifting normally and he came home.

Any idea if there is something electrical in a manual transmission that would keep gears locked? Like a safety switch or a neutral start switch or something?

 

There is nothing connected to the transmission that would do that from a relay. An aftermarket PTO could, pretty rare though.

Was the shifter stuck or was the driveline somehow stuck? Sounds more like a coincidence. Would it not shift while running, because that's classic sample of either a warped pressure plate/flywheel, slave cylinder problem etc. Won't shift very well if the clutch won't disengage completely.

 

Yes it would not shift while running. Push the clutch in and start it, let the clutch out and it bogs the engine like the gears are locked up.

 

Sounds like what happened to me. While in neutral was it like it was in gear? When mine did that i had some bearings sieze up. Needed a rebuild

sent while im laying with your girlfriend

 

Its your clutch slave cylinder or clutch master cylider. Next time it does it try pumping it a few times. check the fluid first!