LT = no progression, completely linear force required throughout movement
P1 = minimal progression throughout movement
P2 = medium progression throughout movement
P3 = most progression throughout movement
LT's are used for crawling when the most articulation is needed. Many swear by them for big air setups as well.
P1's are used for general bashing.
P2's are used for racing a lot and work well for bashing.
P3's require different push rods. They are generally used for pavement or flat track racing. Makes the suspension become quite a bit more rigid as the shocks compress.
I didn't try the LT's ever when I had a revo. Tried P1-3 and never was happy with the air I couldn't hit without slapping the chassis so hard the engine bay would bend. P3's were pretty much un-drivable in a rough environment (moto-cross track I tried at... was horrible). All in all, P2's seemed to work best out of the 3 for me. Still too soft even with hard springs and high oil rate. Think I used silver springs with 60-80 weight oil... 80 made it bouncy and hard to drive. 60 made it bottom out pretty hard with a 5 foot drop.
I think I expected too much out of mine when I had it... Got rid of it and kind of regretted it ever since. Didn't think about how nice it was to have a pretty trouble free rig that ran using a SB engine. Picking up a used slayer... so I'll have a revo style rig again soon.
