LB7 / Allison 1000 Slipping (Delay) on Forward Take-Off

[dgalvin66]

I have a 2002 GMC Sierra 2500HD 4x4, is seems to slip (or has a delay) in 1st gear only during forward take-off. It does not slip for long or even every time I take-off. It runs perfect thru every other gear up and down shifting. I do not notice any jump in RPM when this happens.
I am wondering if it could be a sticky valve or bad solenoid. Also any good shops here in Las Vegas.
Looking for opinions and thoughts.
Thanks

 

[Ron Nielson]

You have checked your fluid level? And when was it changed with new filters? Check the obvious first.

 

[dgalvin66]

The fluid is right on and was changed in the last 500 miles. The fluid change was a bit overdue but the level was never low.
This problem started before the fluid change.

 

[2004LB7]

If your in Vegas the best closest shop is Inglewood transmission. Probably not what you wanted to hear but nobody can beat them for the Allison

 

[dgalvin66]

That's a bit of a ride. Hoping to find someone close that can help with doing the solenoids if that is the issue. I have watched a few videos and I do not feel comfortable trying to do it on the ground especially being disabled.