jlbayes

47re down shift & converter unlock

2 posts in this topic

Ok this is driving me nuts. On my 97 if you use heavy throttle it will down shift from overdrive & unlock the converter even with switches for both to force lockup & overdrive. I did replace the tps with a tps delete with no change. What does not make sense to me is it will do it regardless of the switches. Yes there is a jumper harness for the trans relay in the pdc under hood. It does have an old school dtt voltage box from a previous owner that I am thinking is going to take a permanent vacation. Truck is all stock, no power mods. Previous owner had recently replaced the electronics in the transmission. Switches are tied into the harness near the pcm.

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Try unplugging the alternator and see if the issue goes away, may need to run a potential meter otherwise.

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