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

 

Sounds like the cable is binding up. Might be time for either a new cable, or pull it out, clean, and put some light clinging grease on the internal piece.

 

found the problem the gear was not indexed correctly

 

if in the future it happens again, you can wire your OD on a toggle switch so it works regardless of your vss working

 

No cable. It leads to a sending unit.



GLad the issue has been resolved!

 

Thanks for the input.I did order me an adjustable overdrive switch just in case this doesn't fix the problem.Now I just have to wait for the mailman,

 

How do you wire the toggle switch in for the OD? And where so you get the adjustable OD switch?

Diesel Nut i read a post the other day that you had some info for troubleshooting a PCM for an alternator not charging. I'm having that problem too! Can you help?

 

hey dbwhite 1 you should go here and introduce yourself https://www.dieselbombers.com/diesel...roduction/then ask your question here 1st Generation Dodge Cummins 89-93 - Diesel Bombers hope it helps

 

new pcm solved everything but my overdrive and cruise control,I can live without cruise.Now I have a code 24 from the pcm,which is TPS shorted or open.I put a pot on and still no overdrive.Does anyone have a pic where the wires go in the trans. for the OD solenoid?I thought I found it but I was toldl it was the neutral safety switch.

 

The one that looks yellow in the pic. It faces strait up. Picture looks weird because it is mirrored for some reason they do that when ya upload.

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Ha ha. Wow! Scratch the mirrored part, to many beers tonight.