727 Doesn't want to stay in 3rd gear

Tooljunkie said

Fluid level crossed my mind, but if its freshly rebuilt, there may be a chance a seal got cut in assembly. Talk to the builder.

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Wow, I feel kinda stupid. The tranny fluid always read full (Netruel while running) but I thought I'd give a shot and add .5QT. and almost all my problems went away... I have an aftermarket dipstick, so it seems like the cause has been low fluid all along....

Thank you!