Thread: trans help!

Well, I've had some issues with my trans. for a while now with erratic line pressure and converter flutter/slow lockup. Non of these conditions exist though when trans is cold but start to show when the trans get hotter.

I'm running a external cooler, trans go shift kit on 2, and the pcm line pressure is jacked way up. I have the DHP tuner so I have no converter duty cycle access. Trans. only has 28,000 on it and the converter is brand new from GM. Just today, I installed the TAC adaptor to see if this would help and it did for the most part but I'm still seeing some issues when it gets hot. Still get a little converter flutter(very small now). Funny part is the original trans exhibited some of the same issues, only difference is the cluches were toast by the time i got the car. Anyone have an ideas??

Have you tried to do an entire rewrite on the pcm? Sometimes that helps with the TCC issue. You mention the trans has 28K on it, is this original miles or was it rebuilt? What parts replaced if rebuilt? Was the pressure control solenoid replaced?

Originally Posted by Trannyman95

Have you tried to do an entire rewrite on the pcm? Sometimes that helps with the TCC issue. You mention the trans has 28K on it, is this original miles or was it rebuilt? What parts replaced if rebuilt? Was the pressure control solenoid replaced?

Have tried a full rewrite, but didn't help. The mileage on the trans. is the original milage, not rebuild.

If it is original miles then I would lean on either some internal issues causing debris to collect in the valve body / tcc and boost valve area or you just have a bad pressure control solenoid. The mileage doenst mean it should be fine. Some last a long long time and some do not, especially when you are making more power than stock.

Originally Posted by Reptile

That right there was the first thing that popped in my mind. I had the same issue after it was warmed up, and especially when the TC locked up at highway speeds.

It eventually got so bad that it would buck and kick while downshifting like coming to a stop.

Wouldn't WOT be affected then? Thats the only time it really dosent show any noticable issues at all. Seems to be at 1/2 and lower of the throttle range.

Originally Posted by Trannyman95

If it is original miles then I would lean on either some internal issues causing debris to collect in the valve body / tcc and boost valve area or you just have a bad pressure control solenoid. The mileage doenst mean it should be fine. Some last a long long time and some do not, especially when you are making more power than stock.

Well here's the weird part then, it's acting like the original trans did when I bought the car (slow lockup, hard time staying locked, only acts up after the trans/engine is fully warmed up).

Also, when I bought the car at 70,000, it already had a GM reman the previous owners purchased that was only a year old. The problem dosent show quite as bad as when it's not at full operating temp either. It also seems to affect my regular gears after driving for a few hours, for example the shifts get alot lighter/softer and performance decrease.

Originally Posted by 19SE92

Monte0 Pm me with the complete list of what the cars doing and I'll get ahold of a trusted trans builder that i know and see what he says to do.

What in the hell do you mean 'trusted trans builder'? Do you know anything about Trannyman? Do you know anything about his qualifications, experience, reputation? How about you step up to the plate here and tell us just who this 'trusted trans builder' is. If he is so trusted and has such a great reputation Im sure he would have no problem you posting about him here.

You have crossed the line bud. You are digging your grave and Im gathering the shovels to help you out. Keep it up and I'll find a backhoe and expedite the ordeal.

The Torque Converter Clutch (TCC) should not apply unless the transmission has reached a minimum TRANS FLUID temperature of 8°C (46°F) and ECT temperature of 50°C (122°F). Note when the TCC applies. This should occur in Fourth gear

OK for this particular year here is what the pcm wants to see... This is STRAIGHT off of GMs service homepage, Id love to hear how THIS is not correct info.

Originally Posted by Trannyman95

OK for this particular year here is what the pcm wants to see... This is STRAIGHT off of GMs service homepage, Id love to hear how THIS is not correct info.

Ok, this is good to know. My engine will get up to operating temp. (around 187*) and it still takes about 2-3 mins to engage the TCC. So I'm thinking thats probably no good.

Originally Posted by 19SE92

No Delayed Lock Up Is not normal the trans will lock up no matter how hot it is. the only time delayed lock up happens is on the vaccu trans's like i have. monte0 you got an internel problem there man. The TCC switch is starting to go bad..

Delayed lockup is normal. At least on my car. And every other GTP I have had. And I think even on my wife's malibu.

Mine won't lockup until the trans temp his about 75°F. Doesn't matter about the engine temp. Sometimes the engine temp will reach 195°F and it still won't be in lockup.

Originally Posted by Zef_66

Delayed lockup is normal. At least on my car. And every other GTP I have had. And I think even on my wife's malibu.

Mine won't lockup until the trans temp his about 75°F. Doesn't matter about the engine temp. Sometimes the engine temp will reach 195°F and it still won't be in lockup.

It's a lot more excessive delay then my other 2 regals had with the same trans. in them, thats what I'm going by at least.

Here's a tought, did they ever put the 4T60 trans. in 97.5 with the L67? I heard they were avaliable in 97.5 only as that was the last year. Or was that only with a NA motor? Reason being, I'm wondering if the car originaly had a 4T60 in it? I don't know because I bought with a
4T65-HD...just thinking

Originally Posted by Toasty

it's possbile that its the trans, but what are the odds that your old trans and "new" trans are exhibiting basically the EXACT same symptoms?

maybe getting ahold of a stock pcm and try that one?

I did get a few weird shifts yesterday...only happened at about 1/4 throttle. It usally will not shift that hard even though its commanded to in the pcm, but it just slamed a few times into gear (2-3) out of the blue after the flash. Then went back to it normail

Originally Posted by Trannyman95

They never used the 4T60E on the 97 up cars with supercharged engines as all the L67 engines came with the 4T65E from 97 up. 96 was the only year with the series 2 L67 to get a 4T60E and that was not in W-body cars, so you are safe. The NA 3800s for 97 still got the 4T60E but not the SC engines. The electrical connector is different also so it wouldnt have swapped in place of it without seeing something really stand out that wouldnt work.

Good to know trannyman, thanks. Knew I heard something about that but just couldn't remember.

Originally Posted by Toasty

I'd check around and see if you can find a different stock PCM, and change only what you need to accomodate the 3.29's it's a long shot but perhaps something is actually wrong with the pcm that a rewrite is not fixing

That is possible, I'll have to grab one from my buddy and give ity a try. I did have a issue in the past with a couple bad flashes.