2000whitevert

iTrader: (1)

Okay guys here's the deal the car drives fine on stock rims and street tires shifts great stays in lock up, now when I put my 15" race stars with 275 radials back on after the winter the car keeps popping out of lock up in over drive. Here's the kicker I ran those same rims last year with same 275s and never had an issue so why is it action up now? The car has always had a vibration in the drivetrain but has always shifted hard and never had an issue. I am planning on changing the trans filter and all new fluid should this take care of it ?

mrvedit

Use a scanner to check for codes. The larger diameter tires is likely causing the converter to slip a bit more and the PCM is detecting that as a problem and disabling the lockup. It might be a code 1870, but others are possible too.

Did you have the PCM tuned after install the high-stall converter. If not, this is why it needs to be done.

2000whitevert

iTrader: (1)

See that's the thing the car is exactly the same as last year and I drove the **** out of it last season with no problems now its kicking out of od

mrvedit

I suspect you were just on the edge of getting a code. Now with colder weather the converter might be slipping 1% more and triggering the code. Many auto stores will perform a free code check in their parking lot. Start there.

There is also another very similar current thread:

https://ls1tech.com/forums/automatic...blem-code.html