1badls1bird

Guys, I have been having transmission problems for a while now. My car only has like 11,000 miles on it, but it was bought in December of 1998, so the warranty is almost over. What has been happening is that my transmission seems to be shigting a little late and very rough. When coming to a stop, it is like the tranny just throws it into gear like it is having trouble or something. It is very rough and sort of lurches the car or jolts it a little bit. It si not tranny mount(no banging). The first time at the dealer, they replaced the valve body. That did not help at all. Then, the next time I brought it in, they said they would not take a look at it anymore without charging me due to my mods. Nothing is done to my ranny and I do not use the HPP3 to change firmness on my tranny.
Then, after going to different dealers and getting run around because of mods totally unrelated to my tranny, like MAFs, and O2 simms, and other **** like that, I gave up.

Can somebody please help me figure out what this might be? Does this sound like a front pump, torque convertor? Sometimes, when the TC is locking up, it seems a lttle rough. I once AutoTapped the car and the tranny temp never got really hot and the fluid is PERFECT!!! No burnt smell at all! Sometimes, the roughness on downshifts is worse than others, and it is always worse when the car is cold.

Please HELP ME, I have tried posting before at ls1.com, but nobody could help me diagnose the possibilities. Thanks

Plum Crazy Rob

iTrader: (3)

<img src="images/icons/confused.gif" border="0">

Were there any tranny codes now or when they replaced the valve body? PS, if you didn't already
know, a lot of the tranny codes don't turn the SES
light on.... <img src="images/icons/confused.gif" border="0">

Stock converter, right?

2quick4u

Sounds to me like the torque converter clutch may not be unlocking when it is supposed too. The solenoid that controls TCC lock-up sounds like it is engaging at the wrong time.

Ragtop 99

iTrader: (7)

If you haven't changed the filter, that's a good idea. I've seen a lot of wierd things happen that are filter related.

BTW, the MAF does effect the tranny. It effects preceived load which causes the PCM use different line pressure, and alters its shift and lock-up commands. Putting the stock MAF back on is a good way to rule out any issues caused by that.

SuperCamaroSS

I agree on this one. put the stock maf back on and see what happens. have you ever had any pcm problems? My tranny was acting up for a while and it was a result of the pcm. as soon as i got the pcm fixed all the problems went away.

1badls1bird

Sorry about the title guys, I meant funky, hehe!

Anyways, thanks for the help. I did try putting the stock maf back on and taking the HPP3 off and niether helped. What else should I do. I am gonna try the last dealership in my area and if they do not fix it, I am stumped. I will however be getting a new extended warranty, so I am not oo concerned. Any ways. Should I have the fluid flushed and the filter replaced? I only hav elike 11,600 miles on it with everything stock. never had a PCM problem? More help is appreciated. Thanks!

c4c5specialist

HI there,
Unfortunately, I concur with the dealership on this one. Here is why.
The PCM controls all shift points, line pressure, and TCC apply. Now, it does this, by looking at the engine parameters to chose the appropriate shift points. If the engine is NOT running correctly, in any way, your transmission will act up.
I have seen this on more than 1 occasion. While the o2 sims will cause running conditions, with the air fuel mixture, it shouldnt do anything transmission wise.
Mods are hard on auto cars, more than sticks, so you must be POSITIVE that the mods will be reliable.
Membership is absolutely right, MAF and HPP need to be removed, and then dianosis done.
Sorry, c4c5

SAINT WS6

I'm having the exact same problem with almost your exact mileage. You can see my mods in my sig. I'm taking mine to a transmission shop in January. I've been told it could be the torque converter(I'll just replace it if it is, and with one that has a higher stall!) or stretched out bands(whatever that is).

TwoFast4Lv

iTrader: (8)

C4C5 you are killing me STOP! <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

flyin red TA

I had some issues with my trans related to my ported MAF. Sometimes my car would lock and unlock really rough. Once in a while if I was coasting from 40-30 while the convertor was locked...right when it unlocked the car would die. I went back to a 100% stock MAF and my lockup problems went away.

BTW I have a 98 w/vig3200 and a transgo in my rebuilt trans.