99 4L80 delayed shift no kickdown
Thread Starter
Teching In
Joined: Feb 2012
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99 4L80 delayed shift no kickdown I have a LS swap truck I've driven 2300 mi so far and lately the trans is delaying all shifts. It seems like something is triggering it to use some preset logic because under normal circumstances it does 1-2 and 2-3 and 3-4 shifts at 14-1600 rpms and when the throttle is smashed it kicks down and provides passing gear, but when its in this mode then it moves the shifts up to 23-2600 and no kick down when WOT. I have cycled power on the ecm and it some times will come back to normal for a bit and then go back to this default like logic. The trans and engine are from a 99 2500 2wd truck with 130K .
I have a LS swap truck I've driven 2300 mi so far and lately the trans is delaying all shifts. It seems like something is triggering it to use some preset logic because under normal circumstances it does 1-2 and 2-3 and 3-4 shifts at 14-1600 rpms and when the throttle is smashed it kicks down and provides passing gear, but when its in this mode then it moves the shifts up to 23-2600 and no kick down when WOT. I have cycled power on the ecm and it some times will come back to normal for a bit and then go back to this default like logic. The trans and engine are from a 99 2500 2wd truck with 130K .
Thread Starter
Teching In
Joined: Feb 2012
Posts: 8
Likes: 0
Thanks for the reply ,
It shows no trans codes but I have seen a TPS code and I know that the aftermarket Throttle body I bought has a super cheaply made TPS . Ill change it and see if that helps . Thanks again .
It shows no trans codes but I have seen a TPS code and I know that the aftermarket Throttle body I bought has a super cheaply made TPS . Ill change it and see if that helps . Thanks again .
