Join Date: Oct 1999
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I don't know the schematics of the truck, but offhand I'd guess you've lost the VSS or VSSB (vehicle speed sensor/vssbuffer).
Some trucks have a gear thingy on the output shaft housing of the tcase right before the dshaft. Check that voltage that its working.
Or you could check the trucks speed sensor buffer which is probably near the computer somewhere.
I'm a chevy gal, so I'm picturing those parts, but again, not real sure on Dodges, but may give you something to go on.