Hey Guys, Did any one swap engine?

I have chance to change engine from 2.4 to 3.6 pentastar with AT gear box. My friend sell it from his challenger sxt.

I would like to know what problems I can find in process. I know that challenger has FWD, and we have RWD but as I saw in web that 3.6 pentastar installed in both cars with the same AT gear box. My DODGE 2007 SE with 2.4

The most problem is that my AT4 change transmission up with with a big push after when I had active ride and has a kick push when I change it to the R button after Drive. Is it normal? Or my AT4 die?

It's a cheaper to replace Engine with gearbox than repair it.

Any advises?