RPM to High

[ForRenny]

I've got a 94 XLT 4x4. The truck has always ran great and I take good care of her. Last week I noticed that my rpm's were running to high. For the last 5 years the truck has run 70mph at 2000rpm now all of the sudden it runs 55mph at 2000rpm and at 70mph at 2500-3000rpm. That is the most noticeable difference but it seems to be running 500-1000rpm higher overall.

I've checked all my belts, fluids, plugs and wires. Anyone got any ideas?

 

[Noved1987]

you could try resetting the computer

 

[Masterd]

Sounds like 4th gear or lockup are missing. That would explain the revs.