Biggest issues are:
- high speed shifting (6000-7000rpms)up and down shifts. (synchro issue)
- Shift fork bushings breaking (factrot are made of PLASTIC! brass replacements are available)
- Shift rod o-rings are commonly cut, causing bad case venting through shifter instead of case vent
- Manufacturing inconsistencies...no two trans feel the same. I've had some that feel like crap and never eat parts, and I've had some that were nice and tight and shift great, but eat parts.

T-56 is the better choice, and the SS700'd feel fantastic, however no one makes a bolt in kit, and they seem like they will both need serious body mods to clear.

On a personal note, my Road Runner is as far as I am willing to go with a real RM21 car. If I decide to go any further, I'll sell the Road Runner and get a Satellite. I like my car too much to hack it up.