Speedometer stuck on 70mph

[TBONE1964]

Originally Posted by bob8619

I solved the issues that I described but now a new one has appeared. It seems to be accurate (compared to gps speedometer) up until 25+mph. Once I reach 25mph actual speed the truck speedometer says 50mph and it just gets crazier the faster I go. I figure its shot but figured I'd see if anyone here knows for sure.

If you want to send it to me, I can go through it and make it work correctly or just send you a good working one.

I have a certified speedometer calibration tester and tools to make your speedometer work like new.

Let me know if interested,
Tom

[bob8619]

Originally Posted by TBONE1964

If you want to send it to me, I can go through it and make it work correctly or just send you a good working one.

I have a certified speedometer calibration tester and tools to make your speedometer work like new.

Let me know if interested,
Tom

Thanks Tom, I'll mess around with it a bit more and if no luck, I'll take you up on that offer.

Grumpy, I know that the the cable can stick if not lubed well enough and causes a jumping needle, but it can also just cause it to read faster than actual? And just in case it sounds like I'm challenging your thought, I assure you I'm not.

[TBONE1964]

Originally Posted by bob8619

Thanks Tom, I'll mess around with it a bit more and if no luck, I'll take you up on that offer.

Grumpy, I know that the the cable can stick if not lubed well enough and causes a jumping needle, but it can also just cause it to read faster than actual? And just in case it sounds like I'm challenging your thought, I assure you I'm not.

Here is the test to know if your trans gears are the issue or the speedometer.

Drive on a portion of road where you can go a measured mile, like on a freeway. Don't worry about your actual speed but drive the mile and see what the odometer does. If it matches and rolls one mile for the measured mile driven, then the trans gearing is good. If it does not and goes over or under a mile in the same driven mile, then you look at different trans gears based off tire size and rear gear ratio.

If the measured mile tile passes, then your probelm is speedometer calibration.

Hope this helps everyone understand how it works.

Thank you,
Tom