Dear Blazer Forum
I am running though trouble with my 4L60E.

I bought a rebuild valve body with sonnax kits, and new Transgo plate and a deluxe transmission rebuild kit. All new.

Here my failure mode.

Is this statement correct?
when the 4L60E gets heated up the valve body clearance will be decrease.

When it is cold about zero Celsius I have a 1st & 4th gear.
Now look in the diagram 1-2 solenoid is activated ( pushed in)
When I drive on the highway in 4th gear and is shifting down it won’t shift back into 4th gear. And then I also lost my 1st gear.

Assumption:Is this statement correct?
When the 4L60E gets heated up the valve body clearance will be decrease
I have a lock up of the 1-2 Shift solenoid, I won’t have a first & fourth gear.

Or is this typical electrical soleoid issue. How can I test this with a tech2.

What do you think?

BR

 

I doubt your problem is being created by decreased clearances, but I can't confirm/deny your question about increased heat == decreased clearance. What I can say is that fluid pressure will likely be higher when the transmission is cold as the fluid will be thicker and will not leak past defective seals, etc as quickly.

The solenoids themselves can be tested using a multimeter to determine if they are defective or not. Actual testing their function... I'd have to look into that at some point.