4L60 slipping when engine is warmed up

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Channeled 91

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The 4L60 in my sled is slipping when engine is warmed up. It works fine for a short while, but after she has warmed up, she slips real bad. I pull over let her sit for couple minutes and she will move again, but not for a great distance.She will start slipping really bad shortly after I start driving her again.
Anyone have any thoughts as to what my problem is? Thanks...
 

Channeled 91

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I fixed the leak. It was missing a sleeve. I only drove her once before the leak down. You could be bight... I don't know.
 

Erik the Awful

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Then most likely your fluid pump is burned up. I have a '69 Cadillac sitting for the same reason. Runs great and pulls hard for about a mile. Then it starts slipping...
 

Channeled 91

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Then most likely your fluid pump is burned up. I have a '69 Cadillac sitting for the same reason. Runs great and pulls hard for about a mile. Then it starts slipping...

thats some of the answers I am getting.The truck now makes a whining sound now when she goes into any gear.

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Channeled 91

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Exact same whine mine had. Changed the filter, was starving for fluid. Do it now. I waited not for sure what it was. Just finished a complete rebuild.

It all started when I changed the filter and fluid. I started the truck today and shifted through the gears,and there was mo whine. I am leery of driving her out.
 

Erik the Awful

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I just replaced the filter in WCJr because it's slipping after it gets warm. I'm going to get some fluid for it this afternoon and hopefully test drive it. Really hoping we all have success.

If not, do we have a transmission build-off? I've already priced out the rebuild kit with clutches and bands and a Corvette servo - about $220.
 
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