Question about 1999 Dodge Ram

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1999 Dodge 2500 4x4 quad cab diesel. Having tranny problems only when it is hot outside and the truck had been driven for a while. It goes back and forth between gears usually around 35-40 mph. I don't think if the tranny was bad it would only do it on hot days. Can you please help?

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1999 dodge up to 02 can shuttle shift in and out of lockup, most people think it is overdrive but it is lockup. It is caused by tps voltage jumping around. You'll find you will not see it on a scan tool. The dealer has a computer reflash, it doesn't fix the tps voltage bounce but it makes the computer not as sensitive about locking and unlocking the converter clutch with small voltage change at the tps. I had my truck reflashed, but on rare occasions it still does it a bit. Voltage bounce can start around 90,000 miles and continue to get worse with milage. It cost about $90.00.

Posted on Nov 25, 2009

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Will make a few suggestions. i agree with you that your tranny is not bad. the thing you describe, shifting back and forth between gears at a certain speed is called hunting, lots of automatic transmissions do it. if your truck only does it when hot there are a few different things you could try. you can drop the transmission pan and replace the fluid and filter, if you have had the truck awhile and have never done this it's a good idea anyway. most vehicle manufacturers don't bother to deburr internal metal parts on automatic transmissions, instead they count on a process they call run-in where the parts deburr each other as they rub together. the resulting metal shavings are then caught in the filter. if it has never been replaced you can bet it's full of junk and maybe even partly clogged. one good scam that some less than reputable transmission repair shops run is to show you some of that stuff and tell folks that transmission needs major repair. you need a new transmission gasket, the appropriate filter and some new automatic transmission fluid to do that job. if that does not make your problem go away, or if you know that it has been done recently, you might think about adding an auxiliary transmission cooler. already the fluid goes up to the radiator to get cooled off, but sometimes that is not enough. the auxiliary unit looks like a little radiator and goes in front of existing radiator, just have to figure out a good place to mount it, a/c condenser already taking up some of the space there. lots of folks with trucks as big as yours install one as a preventive measure, especially if you haul things,pull trailers, stuff like that. drops tranny operating temps sometimes a good 30 or 40 degrees, helps your tranny live longer.hope that helps

Posted on Jun 15, 2009


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