740 1987 speedoo gone wild...

Amigaboy · Post by **Amigaboy** » 27 May 2012, 10:29

so , my car sturted to sound like a school bus..the noise was coming from the diff...Hade the car serviced, and changed the diff... now everything is ok, but speedo goes to 220 km/h while driving 10-20 km/h , on 130 km/h it shows 130 km/h..
so I am wondering, is my speed sensor wrong one (Couse the whole diff was changed , Now I got a speed sensor with long wiring, and the old speedo was just a small sensor that had a cable pluged in)..My car doesnt have ABS, so I am wondering, did they put a diff from a ABS car on my non abs car, and maybe that is the reason why my speedo is gone wild

Post by **billofdurham** » 27 May 2012, 12:33

Welcome to Matthew's Volvo Site.

The non-ABS sensor is the small one you had in the original diff. The ABS sensor is much larger and could be the cause of the problem. They are not interchangeable.

Bill.