Blazer with problems

Hi everyone:

I'm having basicly 3 problems with my 98 LS S10 blazer:

1. Transmission changes hard between 1st and 2nd and 2nd and 3rd when it reaches some 95 degrees celsius on the highway and then get into the city. Oil is does not smell burned and in the city once i wait some 5 minutes the transmission changes normally.

2. I have a rought idle.

3. From stopped, when i step on the gas and the back-right tire spins on some sand or the asphalt, the vehicule keeps pulling hard to the right four a couple of miles.

Any advices???

For problem #1, I'd get it to a tranny shop and get it scanned for a pending code, or it may be related to #2. Has the fuel filter been changed lately