LS1 Sounds

iTrader: (11)

I've been noticing the transmission slipping lately in my '98 with ~72k miles, but it only does it in overdrive if I give it enough gas to accelerate but NOT unlock the converter, and it doesn't do it all the time either. It seems to get a lot worse if I am doing a lot of stop-and-go driving in traffic, and the other 3 gears seem to be fine.

I bought the car with a Vig 3200 in it, but there was no aftermarket trans. cooler installed and the fluid needs to be changed. I have a B&M 24k trans. cooler and TransGo on the way , and I will be flushing the whole system myself and changing the filter plus installing the parts hopefully this weekend.

Is there anything else I should do to try to correct this slippage myself? Do I need to be concerned about the life of the transmission? I'm always very careful not to stay in the gas if the transmission starts to slip, and I also try to drive so that I'm not under power when the converter tries to lock up in 4th. Thanks for the advice!

jimmyblue

iTrader: (11)

Mine slips but it's the TCC (converter lockup
clutch), not the trans itself. TCC is a second
PWM down-regulation in pressure and the PCM
*****-foots it for smoothness and economy.
The trans temp plays strongly into the main PWM
line pressure, which the TCC takes only a piece
of.

LS1 Sounds

iTrader: (11)

So do you think that the fresh fluid and cooler might help take care of this? I'm hoping it does, I can't imagine that a trans. rebuild comes cheap.

01Z0H6

iTrader: (63)

I don't think so...
I too have this problem with mine & it only happens in OD @ speeds around 65-68 mph.
I have 143K on my car... Only happens in OD.
I change my fluids religiously, original tranny and all.

I also have the Trans cooler/ temp guage. My care "rarely" gets over 150-160 deg even in the TX heat.

This "should" ease your mind..

LS1 Sounds

iTrader: (11)

Has your car always done this? Or is it something that started happening after a certain number of miles? Thanks.

01Z0H6

iTrader: (63)

It began when i had my Yank installed. I also had it Custom tuned.
LS1 Edit etc....

It's not a problem, really....

Enjoy!

gymratt

iTrader: (3)

I have 70k on my 99, and it just started doing the 65-68mph OD slip every now and then when I'm on the interstate. Some days it does it, other days it doesn't.

LS1 Sounds

iTrader: (11)

That's exactly the way mine acts: sometimes it feels like a nut, sometimes it don't. :p Thanks for the info everyone, if I find out any more info about this topic I'll be sure to post it.

auto5023

I am having the same problem only in overdrive around 55 to 65 mph. Does any one know of a way to adjust the TCC or can it be disconnected?