Another 4L60e going bad thread
Another 4L60e going bad thread Long story short my car was a complete bolt on 99 Camaro that was tuned. I had all bolt ons complete and 4.10 gears with 28” on the car while it got tuned.
So after that tune I put a 3800 FTI stall in brand new and drove it around with no issues at all . It ran great and made a 11 second pass. I always felt like the trans wasn’t giving the quickest shifts but it was shifting fine. Yes I probably should have got it returned but after a little bit of driving I ended up doing a head and cam swap.
The car went right to the tuner and he had issues after a few pulls . The Trans wouldn’t shift out of first under wot and also go into fourth gear. He messed with a handful of things to get the trans to shift but no luck so he did his best and gave me the car back .
I parked it last year not having much time to fix it but now I’m trying to figure out where to start. My first idea was trying to find a used 4L60e and just swap it in thinking maybe the trans burned up while being on the dyno.
So after that tune I put a 3800 FTI stall in brand new and drove it around with no issues at all . It ran great and made a 11 second pass. I always felt like the trans wasn’t giving the quickest shifts but it was shifting fine. Yes I probably should have got it returned but after a little bit of driving I ended up doing a head and cam swap.
The car went right to the tuner and he had issues after a few pulls . The Trans wouldn’t shift out of first under wot and also go into fourth gear. He messed with a handful of things to get the trans to shift but no luck so he did his best and gave me the car back .
I parked it last year not having much time to fix it but now I’m trying to figure out where to start. My first idea was trying to find a used 4L60e and just swap it in thinking maybe the trans burned up while being on the dyno.
I only have first and third. I also tried manually shifting the trans and it wouldn’t go into the gears.
The trans has 50 k on it and was rebuilt 10k ago by a GM dealer with stock parts. I just started nodding this car about 2k miles ago.
TECH Junkie
Joined: Dec 2012
Posts: 3,621
Likes: 1,335
From: Iowa
if 1st and 3rd only, then the band is probably cooked. You should do a pressure test with a gauge on the line pressure port first and foremost. But chances are the band is toast. You could elongate the pin or buy a longer sonnax pin, but that's merely a bandaid for an issue that's already present.
Do a pressure test first and report back before shotgunning parts at the thing.
Do a pressure test first and report back before shotgunning parts at the thing.
Or, even faster, hook a scanner up and watch the data screen for gear commanded. Go out, drive the car, and watch the screen to see if the PCM is commanding a 1-2 upshift. If so, you KNOW the band, the reverse input drum, or the 2/4 servo is DONE. Most likely the band is cooked. Lengthening the servo pin will not fix this. If the PCM is commanding the 1-2 shift, and also the 3-4 shift, but the trans is not seeing 2nd, or 4th.. Break out the tools and get ready to drop the trans..
It's possible... but not likely... that the shift B solenoid is faulty, or the shift B valve is stuck in the valve body. Again, possible.. But I'd bet $$ on the band being damaged. If the band is smoked, DO NOT just put a new band on the old reverse input drum... I can guarantee you that if the band is smoked, the mating surface on the R/I drum is also now damaged as well. New band on an old/damaged drum will mean short life and rebuild again soon. Replace band & drum as a pair. In fact, replace drum and then a WIDE band as a pair.
It's possible... but not likely... that the shift B solenoid is faulty, or the shift B valve is stuck in the valve body. Again, possible.. But I'd bet $$ on the band being damaged. If the band is smoked, DO NOT just put a new band on the old reverse input drum... I can guarantee you that if the band is smoked, the mating surface on the R/I drum is also now damaged as well. New band on an old/damaged drum will mean short life and rebuild again soon. Replace band & drum as a pair. In fact, replace drum and then a WIDE band as a pair.
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