I am having problems with my trans. not shifting into overdrive. Works good in all other gears, also the cruise control doesn’t work, don’t know if this is related or not or a total different problem. Need the overdrive working, any solutions. Thanks

 

check the overdrive button on the dash to make sure it's lit up (turned mine off a few times by accident). if not then i'm not sure because the cruise on my 89 is vaccume operatedand the overdrive is electronic, two different systems.

 

checked button on dash, manual says there is a solinoid that tells the TC when to lock up but can't find it anywhere. ??????

 

i have the same truck and i am replacing that solinoid tomorrow and i am pretty sure that it is inside of the transmission.

 

I had this problem on my '95, it turned out to be the speed sender unit. It's under the driver side on the trans, $42 at Dodge 4 years ago, can't get the part at any parts store, Dodge direct only

 

Having it looked at next tue. let you know outcome.

 

Unplugged the 2 wires to the speed control on the outside of the trans., plugged back in and everything started to work, 4th and ovedrive, cruise and daytime running lights.