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I have a 2000 3.9l 2wd (transmission code in glove compartment tag reads "DGB" & "DGK"). I have had no trans problems at all until the other day when suddenly it wasn't upshifting as I accelerated. Eng would rev to about 2500 then a hard shift up would occur. I found that adding a little tap on the gas followed by quickly pulling my foot off the pedal helped it pushing. Fluid level was ok. Truck sat for about 1/2 hour then drove home fine. I ordered a TPS and used the truck about 3 times while waiting. 1 time was fine, other 2 same problem. I just got the TPS,installed it took a quick test drive, no improvement! I plan to change fluid and filter next, any other things I should change while pan is off? I'm also going to check and adjust the cable from the Throttle Body. I checked and had no diagnostic codes while parked. Do I have to drive it while hooked up to the reader? Thank You in advance. Steve.
 

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I have the same problem and a theory about what it might be, not confirmed yet; mine only does it when cold or when it sits for several days, also after driving for about 5 minutes it goes away. Once it warms up for the day it works fine even if it sits all day and I use it that evening. After several wiring and parts checks, I decided to tap/pull and reinstall the transmission control relay several times in the mornings before starting the truck, so far so good. I've been doing it for three very cold days. I'll now swap relays with the wipers (same Mopar part number) and report my findings. A review of the diagram makes sense as I believe not energizing the relay is part of the ECM's strategy to activate "limp mode". Under score "believe", maybe someone can help on this. Either way not energizing the relay kills the transmission governor, converter clutch and overdrive solenoids.
 
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