Unless you're into 4 wheeling, it isn't worth the upgrade. the 3:1 transfer case give you better crawl ratio.
Example:
VX stock:
2.48(transfer case) x 2.86 (transmission) x 4.30 (axle) = 30.5 crawl ratio
Lower transfer case gears:
3.07(transfer case) x 2.86 (transmission) x 4.30 (axle) = 37.75 crawl ratio
I'm pretty sure the T-case indy has will fit out VXs but its probably not worth the $$. Its a much bigger upgrade for Troopers with a 2:1 T-case. Price is $999.00
If you just want a replacement, I would look at junk yards and search for the transmission because they are usually paired with the T-case.
www.car-part.com