Transmission and AC problems on 2000 Chevrolet Silverado 1500

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After truck has been driven for about 30-45 minutes around town the transmission shifts fast and hard in every gear. It always changes but just fast and hard almost like it has a shift kit in the transmission.It realy jerks hard when shifting. I have 300,000 miles on truck. transmission has never been serviced because i missed the 30,000 mile service and no one wants to do it now.

other than that the truck still runs great and i still get 17-19 mpg on gas.

Also on long trips after driving aroung an hour the AC starts blowing warmer air. You can stop for about 15 min and shut off the truck and when you start out again the AC is good for about another hour.
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