There is a lot to think about when you talk about skids for the oil pan, tranny and t-case....
Are you thinking of a tummy tuck at the same time? I ask because a lot of components and LOTS of money and time get consumed in the process. There are several threads covering such topics that will shed some light on the costs involved.
I just did the UCF TT WITHOUT the oil pan and trans skid...I plan on adding it later
.. base components are as follows for just the TT:
-High Clearance skid ( of course)
-Minimum of 1" BL for tub clearance and/or a Lopro mount can be used
-1" MML ( Motor Mount Lift)
-Adjustable Rear Upper and Lower Control Arms ( I recommend both )
-SYE ( recommended a megshort SYE to lessen the driveline angle )
-Rear CV style Drive-shaft ( required with SYE )
-Rear shock re-locators
-Adjustable rear track bar and/or angled track bar bracket to allow pinion rotation
- possibly' a Novak shift cable for t-case... you may be able to modify existing linkage to work, I did...
-There may be some mods involved with exahaust..
- 6 new 1/2x13 skid plate bolts since the OEM bolts are 'bowled' and won't hold the skid properly
All in all... you are looking at about $1200-$1500 for a complete install if you are starting from scratch.