GM Full Size Vans 1967-1986 Repair Guide
REMOVAL & INSTALLATION
Disconnect the speedometer cable from the rear of the speedometer head. Unscrew through 1972, unclip from 1973.
Remove the old cable by pulling it out from the speedometer end of the cable housing. If the old cable is broken, the speedometer cable will have to be disconnected from the transmission and the cable removed from the other end.
Lubricate the lower
of the new cable with speedometer cable lubricant and feed the cable into the cable housing.
Connect the speedometer cable to the speedometer head and to the transmission if disconnected there.