My 4l60e is acting strange. If I leave the from a stop at almost any throttle position it will shift directly into 4th from 1st. If I am at WOT it will go to 4th and stay there for a few seconds or longer then downshift. Any ideas? There are some codes, but they are unrelated. The TPS and MAP are both fine. Running out of ideas.

 

have u checked ur tranny fluid...maybe its low

 

All the basics check out okay. I checked fluid, connections, etc. Any more ideas?

 

are you sure its 1st and 4th not 1st and 3rd? if its 1st and third sounds like a broken sun shell gear.

 

I was logging it and it was showing 1st to 4th. I am wondering if it is a PCM problem or programming problem. I posted it in the PCM dagnostic section already and came up with nothing.

 

thats weird, u might have to drop it....uve run through most of the basics