Hello all. I recently purchased a 99 4x4 auto regular cab with 106k miles. I was very hesitant on buying an auto but I couldn't pass up the deal. I drove it twice before I bought it, no issues. Only mods were Edge EZ 65 horse programmer and straight exhaust. The trans was supposedly built 1000 miles ago to withstand 600 hp.... No receipts. Anyways the truck ran great all the way home ( 35 miles ). Next day it would start out in 3rd gear. I could manually shift it into 1st and 2nd and up to third but it would not shift to 4th nor overdrive. I started with the fluid, it was past the full line by an inch or so. After searching the internet and asking certified mechanics about my issue I started with the speed sensor on the drivers side of the transmission. No dice. Then I dropped the pan and replaced the governor pressure solenoid and the governor pressure solenoid. Still nothing changed. So I dropped the pan a second time and replaced the overdrive solenoid alon with the lockout solenoid. Nothing!!! I used DEX MERC as advised by my transmission shop. Also the pan had nothing out of the ordinary lying in it. I dropped the truck off at a reputable diesel mechanic last week and he hasn't really had time to look into the trans. I'm getting the truck back tomorrow because he's going on vacation for a week. Only thing he found so far was when in Drive ( D ), the pressure was at 50 psi! I'm stumped and quite bummed. Any and all ideas would be appreciated. I'm borrowing a scan tool tomorrow to see if any codes are poppin up, I have no CEL on at the moment. I know this is a long write up but my situation seems different than anyone else's. Thanks!
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