I am having a weird trans issue.
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From: Thomasville, NC
I am having a weird trans issue. I have got Frank from performabuilt working on this just wanted to get some other in site on what the hell this could be. The transmission shifts fine at part throttle and WOT. When going into drive and overdrive if you lift of the gas and get back on the gas the car wants to free rev like in neutral and it does this is either drive or overdrive. First gear and second gear are normal and doesn't do it. If you manual move it to second gear then move back to drive it will go into gear like its suppose to but if u lift off the throttle and give it gas again it free revs like its in neutral and never catches back up. Frank had me pull the tranny harness out of the transmission so it would go into drive limp mode. Well when we do it will not duplicate issue. Frank has been great assisting me with this issue. I was wondering if any other trans builders might have a small clue on what could be happening. I will try to get a scanner hooked to it tomorrow to see what gear the pcm is commanding when the issue occurs. This just started out of no where. Fluid level is a little over full and the fluid is still new no burning or smell. Trans has less than 800-miles on it.
On The Tree
Joined: Sep 2007
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From: Wisconsin
If the car is the 2000 camaro in your sig, you have the 4L60E. It is not reccomended to manually shift that transmission. It it electronically controlled and manual shifting will only destroy the trans.
Heres whats happening if I understand correctly /
1-ALL UP SHIFTS AT NORMAL AND WOT THROTTLE ARE PERFECT IN BOTH OD AND D POSITIONS
2-KICK DOWN FROM ANY GEAR WHILE CRUISING IS NORMAL BOTH POSITIONS
3-THE ONLY TIME IT WILL DO THIS IS IF YOU RELEASE THE THROTTLE AND THEN COME BACK INTO IT THEN THERES NOTHING THERE OR POSSIBLY ITS JUST IN A GEAR LOWER THAT CAN BE REACHED LIKE 1ST IS ONE IDEA.IT JUST REVS UP AND NEVER CATCHES UP. BUT AGAIN THIS IS ONLY IF YOU LET OFF THE THROTTLE AND COME BACK INTO IT WHILE IN 3RD OR 4TH GEAR. IT WILL NOT DO IT IN MANUAL 2ND BUT I ASSUME IT HAS SECOND GEAR START WHICH WOULD EXPLAIN THAT.
4-UNHOOKING THE HARNESS FROM TRANS CAUSES LIMP MODE THIRD GEAR ONLY AND WHEN IN THIS THE CONDITION CANNOT BE DUPLICATED IN EITHER D OR THE OD POSITION. IT CAN ONLY BE DUPLICATED WITH THE HARNESS PLUGGED IN.
5-FLUID IS FULL AND CLEAN NO SMELLS NOTHING OUT OF THE ORDINARY.
6-THIS STARTED HAPPEING SUDDENLY WITHOUT WARNING.
I have a theory that something happening on the release of the throttle causing a shift back to first but have no idea how that possible, But until we can see what the pcm is telling trans to do theres no way to say,
For now its speculation but as mentioned certainly and odd issue.
Just posting this to clear up what it is doing for anyone who would like to venture a guess.
1-ALL UP SHIFTS AT NORMAL AND WOT THROTTLE ARE PERFECT IN BOTH OD AND D POSITIONS
2-KICK DOWN FROM ANY GEAR WHILE CRUISING IS NORMAL BOTH POSITIONS
3-THE ONLY TIME IT WILL DO THIS IS IF YOU RELEASE THE THROTTLE AND THEN COME BACK INTO IT THEN THERES NOTHING THERE OR POSSIBLY ITS JUST IN A GEAR LOWER THAT CAN BE REACHED LIKE 1ST IS ONE IDEA.IT JUST REVS UP AND NEVER CATCHES UP. BUT AGAIN THIS IS ONLY IF YOU LET OFF THE THROTTLE AND COME BACK INTO IT WHILE IN 3RD OR 4TH GEAR. IT WILL NOT DO IT IN MANUAL 2ND BUT I ASSUME IT HAS SECOND GEAR START WHICH WOULD EXPLAIN THAT.
4-UNHOOKING THE HARNESS FROM TRANS CAUSES LIMP MODE THIRD GEAR ONLY AND WHEN IN THIS THE CONDITION CANNOT BE DUPLICATED IN EITHER D OR THE OD POSITION. IT CAN ONLY BE DUPLICATED WITH THE HARNESS PLUGGED IN.
5-FLUID IS FULL AND CLEAN NO SMELLS NOTHING OUT OF THE ORDINARY.
6-THIS STARTED HAPPEING SUDDENLY WITHOUT WARNING.
I have a theory that something happening on the release of the throttle causing a shift back to first but have no idea how that possible, But until we can see what the pcm is telling trans to do theres no way to say,
For now its speculation but as mentioned certainly and odd issue.
Just posting this to clear up what it is doing for anyone who would like to venture a guess.
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From: Thomasville, NC
Thanks Frank for clarifying what I was trying to say. I am hoping to get it on the scanner tomorrow to see what is being commanded. It is a really weird issue. I mean the trans was running fine, drove the car 50-miles to my buddies shop, 5 hours later we went to go eat start down the road and this starts happening. We thought maybe fluid was low but its full. Trans isn't beat on and it was built by one of the best tranny guys out there. So if anyone can think of anything please chime in.
Your welcome I just wanted to break it down in such a way as to avoid silly questions lol I to am very curious about this one.
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Trans Issue How many RPM does it go up when you get back into it? Possibly the lock is not working correctly?- Junk Torque converter? I would think if it is a downshift solinoid it would throw codes.
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I am leaning towards the sprag also but odd that it does it in D to with the overun clutch on. But then I have seen both parts give way at the same time also.
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From: Thomasville, NC
Nope no driveline shock or rear end breakage. Car doesn't really get beat on hardly at all. I mean I making 430hp/390lbfts on motor and 608hp/520lbft on spray with a window switch. But the car has only be sprayed twice and only been to the track twice in a year.
Guys, If the car moves in the OD or D range from a stop (1st gear) then the sprag has to be ok, (holding) otherwise you would have to pull it down into 2nd or manual 1st for the car to move. The overrun clutch does not come on until 3rd gear is reached in the OD or D range in the 4l60E. I was thinking a broken overrun clutch hub at first when he said it had a neutral feeling after lifting off the throttle (no engine braking). But now he's saying no 3rd or 4th so I think it's progressed into the 3-4 clutch circuit as well. Bottom line it needs to come out to be fixed.
Chuck
Chuck
is this true? Guys, If the car moves in the OD or D range from a stop (1st gear) then the sprag has to be ok, (holding) otherwise you would have to pull it down into 2nd or manual 1st for the car to move. The overrun clutch does not come on until 3rd gear is reached in the OD or D range in the 4l60E. I was thinking a broken overrun clutch hub at first when he said it had a neutral feeling after lifting off the throttle (no engine braking). But now he's saying no 3rd or 4th so I think it's progressed into the 3-4 clutch circuit as well. Bottom line it needs to come out to be fixed.
Chuck
Chuck
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