Engine/Transmission (1998.5 - 2002) another t/c question

[VolsFan]

Hi, I know there are a million threads on this subject, I have been on here searching for a little while. On my dads 99 2500 work truck, his torque convertor seems to slip as soon as the trans shifts into overdrive around 40-45 mph. it will continue to do this until you get up to around 50 and then all is well again. This is annoying when traffic is going right at 40, I will generally lock it out of o/d in those instances. Some possible solutions I have found is to check the ground from battery to PCM, reset APPS (is not throwing any codes though) and a tin foil fix? I saw this but do not quite understand how this works. I also saw a noise filter could correct this also, that will be last resort. If nothing else, we'll take it to where i got my trans done, mines pretty much bulletproof now. This is basically a stock truck, about 275,000 miles on it. This is the second trans he has had in it, less than 10,000 miles on this one. Thanks,

Rick

 

[DCreed]

try a "mystery switch"

 

[DBraunig]

I've had good luck with cleaning the grounds/battery cables and the "foil" on the alternator wire. There is also an old tsb #18-02-99 that is a software update for the pcm just for this condition.



I'm sure the noise filter works, but these three have always worked well for me.



Dave

 

[JCyrbok]

Could it be that you are mistaking the TC locking up at 40-45 which is around when mine locks up (it almost feels like a light shift) and when OD kicks in which is between 47-55 on my truck (depending on throttle)? Or are you seeing other symptoms of a slipping TC at the same time ie: RPMs go up with out a corresponding increase of road speed when the throttle is pushed hard?



Just something to think about.



J-