Piece of cake- you have a few options:
hotbodies lightning buggy diffs ( hard to find complete )
ofna buggy diffs
LST2 diff internals ( cheapest route )
You'll need the 43/13 ratio diffs whichever ones you choose, since the 43/10 option drops the ratio too much, resulting in you having to gear up ( spur/ pinion )
alot in order to make any kind of speed.
There are a few good threads to reference for parts / installation instructions:
http://www.rc-monster.com/forum/showthread.php?t=8012
http://www.beatyourtruck.com/forum/s...Best-1-8-diffs
UE diffs & FLM hybrids use exactly the same parts & same method of installation, so its all gravy
