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Andy4639 · 03-25-2015, 08:21 AM

Take the cable loose at transmission and hook the cable to a battery drill and see if the speedometer will work. If so then it's something inside the transmission.
If it doesn't work then either the cable is bad are the speedometer is bad.Just bump the drill the first time to make sure the rotation is right.

03-25-2015, 08:21 AM	#3
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: 71 c-10 Take the cable loose at transmission and hook the cable to a battery drill and see if the speedometer will work. If so then it's something inside the transmission. If it doesn't work then either the cable is bad are the speedometer is bad.Just bump the drill the first time to make sure the rotation is right. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.