My speedometer is also 10 mph off. When ordering knew gears, the old gear is 17 tooth, right hand pitch, I need either 19-20 at least, but is there a difference, between the toploader and the newer t5, in the pitch left or right? Could this be why the gears are getting chewed up, and some of the inaccuracy of the mph. Thanks for any help resolving this.
Toploaders have two different drive gears (the gear on the tailshaft) depending on what side the speedo cable plugs into (drivers or passenger side) I swapped a Toploader into my 77, I did nothing to the speedo gear on the cable and it's working fine There are different cable gears though some are short, some are double length toothed portions, the double lengths are for automatics only(or could be a C6 gear ?). If ou're only ten mph off I would try an 18 tooth gear, not the 19 or 20
Thanks guy's, after looking in the trans. the black, drive gear appears to be left hand pitch. My (white) 17 tooth speedometer cable gear is right pitch, with what appears to be left hand marks across the right angle gears. The gears from AK are cheep enough I'll do some experimenting with the left tilt, and go from there. I will post results, when I figure this out, if I do.
I finally got the new gears from AK, put the 19 tooth left tilt on the cable, and noticed it slid in the trans far easier. The old 17 tooth right tilt, even came out hard, so that was good. Took the car for test drive and it is right on. Drove about a 100 miles or so and checked the gear, looked good with no cross wear marks and speedometer is really steady and accurate. I now feel confident of the speed I'm running. Thanks for the advice,and help guys
I quit messing with the gears and put in a TomTom One gps. It sticks to the windshield and gives accurate GPS speedometer readings regardless of tire size, gear size, or speedo gear. https://www.youtube.com/watch?v=UPbRfloZ0JA&feature=youtu.be
It depends on the system they are using. If you have enough satellite connections ( I usually have 6 or 7) many of the better devices can get altitude readings. The app I use currently on my tablet is very accurate in the hills.
The GPS our company uses to monitor our speed is hardly what could be called accurate. The few times I've been "caught" speeding, it was found later that I was right and the GPS was wrong. It's anything but 100% accurate. And don't get me started on MapQuest, which also uses the same technology, that too is anything but 100% accurate.
Yea lots of stuff screws with it, the most annoying being heavy cloud cover. I've learned to tell when it's about to start dumping by the drift between my mechanical speedo and my gps speedo.
