60L80E, air suspension, and a general question

[The Professional]

Appreciate the responses.

I'm looking at 06-08 models. I'm familiar with the model year differences and the only one that causes pause when considering a pre-08 is the transmission.

Interior upgrades don't mean much to me and the motor is a moot point even at 65+ hp increase.

I just didn't know if people had tried putting the 6speed trans to a 6L motor. My limited mechanical knowledge makes me believe it not only be possible but easy.

The air suspension: As I understand it, the main purpose is leveling the ride under load. Is there another benefit? Do all those benefits outweigh it's issues? How prevalent are those issues?

I'm trying to decide on sucking it up and spending the cash on an 08 or saving some dough and getting an 06 and swap the transmission. Also, trying to figure if the air suspension is worth it.

Thanks guys.