The speedometer on my 1972 Satellite starts at 20 mph at a stand still and goes up from there. So when I am going 5 mph, the speedometer reads 25. Seems to be accurate just 20 mph too high. How do I adjust the starting point?
was something changed in your car..like the rear end gear ratio.. that is a huge jump..how about speedo gears in the back of the transmission///most domestic US version cars use 1,000 speedo cable turns per mile.. there is a chance that somebody messed with the spring tension inside the speedo?could the NEEDLE be installed in the INCORRECT position on the shaft..i have NOT had one of those speedo heads apart in many many years.. and i don't recall exactly whats going on inside them.. please place a mark on the tire straight down.. a matching mark on the pavement.. roll the car forward one tire turn and place another mark on the ground where the mark on the tire lines up... measure between those marks.. that is tire roll out.. if you pop the speedo gear out of the side of the transmission.. can you count the teeth on the driven gear that removes from the side.. this gives us the idea of what sort of speedo cable speeds. but it really sounds like you have a speedo head issue..
just in case.. here are several articles on speedo repairs, recalibration and more throughout the many magazines here..i did not go thru all these but you should..http://www.moparmusclemagazine.com/sch/02/speedometer/photos/?SearchSource=SourceInterlinkMediafind after you open each one.. look for the link to return to the article .. either upper left or lower left corner of the image depending on the magazine its in..
Because there is no change with the speedo cable removed, I'm also thinking it is in the speedo head. I'm hoping to find that there is a way to adjust it. Finding and replacing it could be tough.
wait a second.. the speedo moves as the car accelerates with the speedo cable disconnected from the transmission or back of the speedometer?? are you sure its not like a certain red 58 plymouth fury named Christine???adjusting the speedometer requires a specialized machine and knowledge.. see articles linked above..here is one from page 2 on getting the calibration right..did it ever work properly.??? while you owned it.. or have you swapped rear end gears.. http://www.rodandcustommagazine.com/techarticles/0801rc_mechanica_speedometer_calibration/you may want to use the PRINTED YELLOW PAGES and look for SPEEDOMETER service in your area.. or find one of the many speedometer shops around the country..
I see articles referenced from the cable to the tranny gear, but nothing on the speedo head. I almost have the instrument cluster out but the steering column won't lower. I have just about every bolt out from under the column, but it won't budge. Do I have to disconnect the steering shaft from the steering box?
there are only a few bolts that hold the column to the struts in the dashboard supports..several on the floor that seal the column to the firewall.. i have been looking around for articles.. question.. do you have round speedo and gauges like a rally pack.. or the rectangular version. ????
I have the rectangular version. I was able to shake the speedo until it settled down at about 5 mph, but then I bumped it again and it went back up to 20 mph.