1985 f-250 just bought last week. rebuilt motor turbo-ed new tranny as in my last thread.

Speedo quit. small parts to replace or go whole cable assembly?

 

Need to check to be sure that the cable turns, both at the speedo end and transmission end. It can be a bit of a pain, but you need to likely take the cluster out. First though, do you have cruise control? If so, the speed sensor may have seized up, so you need to take it loose to check that. I have seen cables break, the plastic gear strip out internally, as well as the teeth, and then sometimes, but more rarely, the speedo head fails. generally it will be either the cable, speed sensor, or gears in the trans. You have one that goes around the tail shaft, and one that is driven by that gear.

 

i have cruise control but it does not work. trans is brand new. less than 300 miles. will check cable at both ends. thanks

 

As fellro stated, "CHECK THE SPEED SENSOR"

If you buy a new cable, and the senor is binding, it'll tear the plastic end off your brand new cable.

 

if it is automatic the gear in the trans is steel most likely the plastic gear has stripped on teh speed sensor if it has lube teh cable before reinstalling it