There hasn't been a 4cyl 4x4 since '97(possibly earlier). 98+ if it's a 4x4, it's got either a 3.0 or 4.0, regardless of cab config.
They've been off and on the past decade on 4.0 reg cab 4x4. Last year you couldget that combo was '08 and it was a special order(aka you built it and spec'd it out to your preferences). Very scarce also is even 4.0 reg cab 2wd.
For 09+, if you order a 4x4, you automatically get the 4.0 and xcab. That's my understanding.
They've been off and on the past decade on 4.0 reg cab 4x4. Last year you couldget that combo was '08 and it was a special order(aka you built it and spec'd it out to your preferences). Very scarce also is even 4.0 reg cab 2wd.
For 09+, if you order a 4x4, you automatically get the 4.0 and xcab. That's my understanding.