Good morning.
This transmission is a very troublesome transmission. It had all kinds of issues such as your complaint.
The issue with yours is the valve body. The downshift valve gets stuck in the valve body casusing this issue. You can try adding some valve body modifier to see if it helps, otherwise you are going to need to drop the valve body and clean it all out.
Roy
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Wednesday, March 24th, 2021 AT 1:48 PM