I have a 01 z28 when I got it, it shifted fine well I let it sit for about a month or 2 and now it slips a little in second but sometimes u can manual shift it and it does fine. Does anyone know what the problem could b?it also won't shift at WOT

 

Does it hit the rev limiter on the 1-2 shift at WOT?

 

Yea and then when u let off it goes in second but then it slips a little when u get on it. But all the other gears work great

 

Sounds like the 2-4 band is worn out. Probably a good time for a rebuild/upgraded unit. What kindof mods are done to your car and what do you do with the car? Drag racing, auto cross, daily driver, ect.

 

It has a ls6 intake and 3.73 gears. It's a daily driver and I hot rod it some

 

Gotcha. If you were interested in one of our built transmissions I would recommend one of our Level 4 builds. They are $1,995.00 with your core exchange. It will be more than enough trans to handle what you are doing and give you room to grow in the future. Let me know if you have any questions at all. I'd be happy to answer them regaurdless if you are intested in a trans from us or not.

 

Could dirty fluid and filter cause it to do that. Because sometimes u can manual shift it and when it takes second it will bark the tires