4R70W MVB back to factory VB questions

VA-Mach1

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If I install a full manual valve body with trans brake on my 4R70w in my 99 GT for use at the track, can I remove it and reinstall the factory automatic valve body for automatic use in the winter?

Is it no return after going MVB?
Would I need to have 2 transmissions?

I searched. Only found results to install a MVB or a reverse MVB. No results for undoing or returning a transmission back to automatic.
 

01yellercobra

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It's been a while since I've looked into manual valve bodies for anything, but IIRC mods need to be done to the case side of things that aren't easily reversable. Essentially the trans is set up to be at full line pressure all the time since it doesn't have the connection to the throtte anymore. Along with any wiring that might need to be done and passed through the case or pan.
 

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