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I can back this up as well, Trans-X will make the flattened internal seals swell up again for awhile. I`ve used this and Lucas stop leak to keep my delayed engagement issue at bay until my other car is road read. Don't over fill it, if it doesn't damage the trans inside it might pop your cooler lines while driving and the subsequent loss of fluid all over the road will surely cause some issues.

I can vouch for this! Did you resolve the problem?

I have posted this reply to similar threads asking about this about a dozen times. The valve body has an internal leak. I have seen this many times where you decelerate and the transmission is basically in neutral until you rev, build up some pressure and it slams into gear. Only happens when using OD and does not do it in 3. A bottle of TransX can "fix" the problem. It works every time and takes about 15-20 miles of driving to fully stop this. My old 92 lumina started doing this 12 years ago. A bottle of TranX every three years when the problem returns and it's still going and no rebuild was required. I don't own the lumina any more but know it's still running with go4damo and he is aware and has used the TransX to solve the problem himself I beleive. I have recommended the TransX to bunch of people locally and it has worked on every car. Only mechanic in a bottle that I actually am amazed with.