I have a 92 d250 auto w/overdrive.My speedometer doesn't work and my trans will not go into overdrive.I took the speedo gear out of the tail end of the trans and it was worn down.The one I took out was yellow.I replaced it with a green one and it worked a couple miles and the teeth got eaten off and speedo quit again,The dodge dealer(parts) informed me the yellow 30 tooth gear has been discontinued.He also informed me that all the gears are the same diameter just different number gears depending on gear ratio and tire size.My question is do I have an internal trans problem that's going to keep eating up gears?If so is this a hard fix?I would hate to have to take the trans out and a apart just for speedo.But I want to have overdrive and I have been told if the speedo doesn't work this could be the reason I have no overdrive.Any help would be appreciated.By the way I just bought the truck with this problem.Thanks

 

you might need pull the trans extension housing to replace the output shaft "drive gear", and get a matched "driven gear", napa has some, speedo shops deal mostly large truck, but might have what you need, the sticky has odometer sources, also ebay ive seen them, try to get the part number, and shop it with that

 

You will have to wire in a manual switch for OD until you get the VSS drive problem sorted out. With no VSS, the PCM thinks the truck is just sitting still, so you get no OD.

 

thanks everyone I figured out the problem just got off phone with a transmission shop in Louisiana and they found what was wrong the gear wasn't indexed correctly that is why it tore up.waiting on my new gear should be here friday.They said that is why my overdrive doesn't work.I will keep you posted if this fixes my problem.I hope so

 

ok put the gear in and my speedometer works still no overdrive and my odometer is not working I bought a kit with adjustable potentionmeter still doesn't work.Frustrated getting dark,any other suggestions