RPM 4L80e shifting issue - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

graf101 · 11-06-2018, 11:35 AM

I have an RPM stage 5 4L80e in my 2015 1LE and have begun to experience a delayed 1-2 shift or it will bang off the rev limiter. This has started to occur in the cooler weather, so my initial assumption is that the engine is making a little more power with the cooler weather and better DA, so the engine is hitting the RPM much quicker than what the TCM controller is tuned at. I tried tweaking the shift points and mph, but it doesn't seem to help on the 1-2 shift. Is the transmission sprag out internally or could it be a tuning issue? I am running the PCS TCM 2800 and it can be data logged, but I don't really know what I am looking for. Any help is appreciated.

scotty9794 · 11-18-2018, 10:32 PM

I had posted a reply after you put one on my similiar issue post. My issue wound up being my converter. It was "rebuilt" by the manufacturer, but after 100 miles it began slipping. By 250 miles it was glaringly apparent it was faulty. Trans builder went through it and i had no issue other than some heat damage to the clutches and intermediate discs. Theyre replaced now to be safe. Waiting on converter again. It wouldnt shift because the slipping didnt let it build enough pressure.

graf101 · 11-20-2018, 03:57 PM

That sounds like it could be my issue! Thanks for the info!

11-06-2018, 11:35 AM	#1
graf101 Trouble_SM Drives: 17' Summit White ZL1 Join Date: Jan 2015 Location: Midlothian, TX Posts: 449	RPM 4L80e shifting issue I have an RPM stage 5 4L80e in my 2015 1LE and have begun to experience a delayed 1-2 shift or it will bang off the rev limiter. This has started to occur in the cooler weather, so my initial assumption is that the engine is making a little more power with the cooler weather and better DA, so the engine is hitting the RPM much quicker than what the TCM controller is tuned at. I tried tweaking the shift points and mph, but it doesn't seem to help on the 1-2 shift. Is the transmission sprag out internally or could it be a tuning issue? I am running the PCS TCM 2800 and it can be data logged, but I don't really know what I am looking for. Any help is appreciated.

11-18-2018, 10:32 PM	#2
scotty9794 Drives: 2011 ss/rs Join Date: Sep 2016 Location: Lincoln, Ne Posts: 48	I had posted a reply after you put one on my similiar issue post. My issue wound up being my converter. It was "rebuilt" by the manufacturer, but after 100 miles it began slipping. By 250 miles it was glaringly apparent it was faulty. Trans builder went through it and i had no issue other than some heat damage to the clutches and intermediate discs. Theyre replaced now to be safe. Waiting on converter again. It wouldnt shift because the slipping didnt let it build enough pressure. __________________ TMS forged 376, 237/239 cam, AGP kit w/ s256 twins and race intercooler, Alky dual nozzle meth system, FIC 127lb injectors, Fore dual TI 450s, Jakes stage 4 4l80e, Circle D triple disc billet 3400 stall, DSS aluminum shaft, eBoost 2 controller, BMR toe rods-adj lower control arms-adj trailing rods, and bushings, nt555r rears.

11-20-2018, 03:57 PM	#3
graf101 Trouble_SM Drives: 17' Summit White ZL1 Join Date: Jan 2015 Location: Midlothian, TX Posts: 449	That sounds like it could be my issue! Thanks for the info!