I would venture to say it is definately an internal issue of the transmission. A 1 minute or do delay tells me you or probably loosing pressure going to the appropriate clutch pack somewhere. Is the delay constant when cold, or does it go away after the initial engagement before shutting down the engine.

Richard

 

Richard
Had to quit so I could go to work but wanted to let you
Know hot or cold doesn't seem to matter
Yeah probably time to go thru it I've been doing
Some web studying trying to decide to
Get into myself

 

Moved out of the how to section.