B18B1LS1

iTrader: (12)

Last night at the track my tranny went straight from winding out first into OD and then just stayed there until 60 and then locked the converter! This was at WOT on a stalled but otherwise stock 4L60E. It only seems to do it after it has been sitting awhile, if I had hot lapped it back around again it would have been fine. Any ideas? It really sucks to wait in staging just to run 15 second 1/4's! Thanks.

Jeffrey

Cerebrex

iTrader: (20)

check your line pressure and make sure your fluid level is good.

B18B1LS1

iTrader: (12)

Both are good. The line pressure is near stock, via HP anyway. And the fluid level is right where it should be. I logged the runs on my HP and couldn't find anything out of the ordinary. Any other ideas? Anyone?

BADFNZ

iTrader: (19)

That's just the skip shift bro

But in all seriousness, I've never heard of this happening so keep us posted.

B18B1LS1

iTrader: (12)

Oh well, I guess I have a powerglide from time to time!

BADFNZ

iTrader: (19)

With one hell of a bog I'm sure!

Evil 99

It has been my experience that a 1-4 upshift is caused by a defective shift solenoid B in the trans. the shift solenoids are both the same and relatively cheap from the dealer.

B18B1LS1

iTrader: (12)

Would a bad solenoid throw a code? So far I've had nothing. But if they are cheap maybe it's worth a try.

Evil 99

It would only set a code if the electrical part of the solenoid was at fault.