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| | | | Joined: May 2009 Posts: 57 Wrench Fetcher | | Wrench Fetcher Joined: May 2009 Posts: 57 | Hi fellas,
Although I have a 66 C20 pickup, I think this question applies to all old trucks. Does anyone know a good place to buy a new speedometer cable that can be adjusted to my new ring and pinion?
I took out the old Eaton rear end and put in a Dana 60 so I could put in a 3.54 ring and pinion. Now my speedo is way off, plus my old speedo cable is shot anyway. Who sells that stuff?
Thanks much! | | | | | Joined: Jun 2009 Posts: 2,201 Shop Shark | | Shop Shark Joined: Jun 2009 Posts: 2,201 | The calibration of the speedometer is usually done in the speedometer not the cable. There is a torsion spring that can be calibrated to match your new gears and tire size. Another way might be to use a GPS system to make a mental calibration so you know how fast you are going compared to what speedometer reads. I use a GPS system exclusively as a speedometer and in the unlikely event that I should get "lost" I don't have to stop for directions. | | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | speedo cables, which are available at any FLAPS, are not "adjustable" ... when you change rear ratios you need to get a new speedo drive gear in the trans appropriate for the ratio - or do as Vern suggests and "mentally calibrate" the reading using GPS or another vehicle with a known correct reading speedo
Bill | | | | | Joined: May 2009 Posts: 57 Wrench Fetcher | | Wrench Fetcher Joined: May 2009 Posts: 57 | thanks!
do you know then where I could search for the new speedo gear drive? | | | | | Joined: Feb 2008 Posts: 829 Shop Shark | | Shop Shark Joined: Feb 2008 Posts: 829 | In addition to a new speedo cable, I think you need to be looking for either the correct driven gear(at transmission end of cable inside transmission), or a speedometer ratio adapter. Type speedometer ratio adapter into Google and see what pops up...  | | |
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