Hey guys:

I have a 1998 TJ Wrangler, and I am unsatisfied with the hill climbing power out of the little 2.5 I have in it. I want to put in a 4.0 with air conditioning, as I also lack A.C. It is necessary in summer traffic jams which plague Minneapolis.

My question is: Can I have a 4.0 with air bolted into a 2.5 that didn't come with air? And further, do I have to buy a new transmission? Thank you. There is a 4.0 out of a 2000 cherokee that is for sale and I was told it wouldn't fit.