A4LD Transmission Question/Concern

[blindman_10]

Here is the deal: I own a 1994 Ford Ranger 2.3L with an A4LD. It drives and shifts fine (no grinding or slipping) but when I pull codes i get errors saying both transmission solenoids are not functioning correctly (I've checked the connections/wiring externally and everything appears alright). My concern is highway driving. I do not have a tach so I'm having a tough time determining if my transmission is going into overdrive/if its locking up correctly. My question is, if my transmission is not going into overdrive correctly (lets assume for a moment), could prolonged use at highway speeds (2-3 hours continuously) cause any damage? Will I just have crappy gas mileage? Could this create too much heat and burn up the trans fluid? I'm mostly a complete newb when it comes to transmissions so any help on this topic would be appreciated. I plan to replace the solenoids and do a valve body rebuild in a few months (when I have the garage space) but that will have to wait!