while towing over steep grade w/switchbacks no lockup under 30 mi. in drive -tow/haul [unknown at time i could have locked 2nd manually] trans was all over the place flaring in and out of 2nd ... red temp light came on and o/d off light came on [tow haul went off] this happened about 4 -5 times on this grade i eventually disconnected tow and frog leaped them up hill individually. no codes that day. next morning in town on level driving the trans would not shift out of 2nd untill 3500rpm to 3rd. then check engine light came on and gave me the gov solenoid code. I replaced that w/ borg warner. and stock transducer sensor. this corrected 1-2-3... and shifts nicely. pulls hills nice and locks in 3rd. and 2 if i manually select at console... but no overdrive. ive read forums and hear about all these electrical issues, bad ground, mystery switches etc... there are no new codes, old ones are cleared, can you help me please... .thanks in advance. transmission shops are useless, they act like they dont know about scan features and all suggest a 2500 rebuild. without looking into any of these electrical sensor issues. i know they think they can fix quick within 200 and are hoping its a wire, but wont tell me.