What are the differences between a '99 5.9 and a '02 5.9 -- both coming from Durangos. I have a '02 with a tired motor and '99 that has been wrecked, but has a strong motor in it. Also, are the trannys interchangeable, or no? The 99 has a good trans with a shift kit, the '02 is a slush box. Last tidbit of detail is the '99 is a SLT 4x4 and the '02 is a R/T...so I know the transfer cases are definitely different. Bottom line, can I swap the '99 motor and trans into the '02 without much headache?

Thanks!

Mike