ok i have a 99 dokota 3.9 4x4. the problem is the abs light came on while driving at the same time the brake light came on. the speedomotor isnt working as well. while im driving the neeedle will stay on zero but if i let off the gas while moving it will move up to about 30 miles a hour to 40 miles a hour. i was wondering if anyone esle has had the same problem? if not who could tell me where to start looking for the problem

 

Speed sensor needs replaced

 

Start by running a diagnostic test.

 

ok i replaced the speed sensor yesterday this did nothing. i replaced the one on the transmission. someone told me there is one the the differental ? not sure if this is on the same truck but planing on looking at that tommaorw. my check engine light came on as well today so planning on getting the code read and see if it has anything to do with the problem at hand

 

Yes there is 2 speed sensors and as far as the check engine light turn the key to the on position 3 times in a row and on the 3rd time leave it on and codes will show up in the odo and then just post up the code

 

You should also have 2 sensors on your front wheels.

 

The only way that there will be sensors on the front hubs is if he has 4 wheel abs, and that is only for the brake's, not the speed sensor's.

 

isnt there one in the rear diff? or is that for abs only?

 

Yes there is also one on the rear diff