Transmission Swap

The Ford dealership swaped out my transmission with a rebuilt one at 85,000 miles beacuse my transmission went out. Two days later after I got it back I had trouble cranking it. I would have to turn it over 3 4 times before it would crank. Then after about a week it got to were it would take me 5 to 10 times to crank. Dealer ship said it was not related but that seems kind of strange.