Type F or Dexron, why do some HP guys dislike type F

I wish I was closer to your trans guy, lol.

Mines ok but like he rebuilt it last fall, got like 2,000 miles max and it gets morning sickness, lol. Running it a few mins and stopping it dis engage like, need to rev the motor up and it catches. Once hot is great, tranny guy says its the front clutch going or in the valve body, its manual. Bring the car on by and leave it overnight, hes 45 mins away, I'm thinking of just yanking the trans out at home and bring it on up. Says manual bodies on the street is hard on the trans, ??