Would you mind elaborating on this a bit? Some good tech here and civil discussion that isn't found elsewhere. If nobody else minds, I'd appreciate a few more comments on this.
Best of Luck,
its kind of hard to describe without having seen it first hand. but look at it this way - so when you have weird antisquat numbers and you hit the gas, part of the torque is transferred into your suspension and the body squats right?
now imagine you've got an independent suspension that is driven, and infront of one tire you have a rock that is larger in height than the rolling face of the tire, so ultimately the tire is going to have to be pressed into the rock for it to climb the face of the rock and then roll ontop of it.
with an live axle the suspension is either being pushed or pulled into the frame as the axle shaft loads torque and applies it to the tire. with an double A arm suspension, the arms are being torqued back. one side is planted while the other is being pulled. the axle shaft turns and because of the geometry it starts forcing the suspension to squat or rise depending on how and were the torque is applied (front vs rear etc). that squat or rise is happening because of the applied torque, which is coming form the transmission.
so in turn the transmission is not only applying torque to the tire, which is in a heavily bound state, its also applying torque to the springs and the shocks. lets say that the vehicle this IFS/IRS suspension is on is sporting something like a 3.0 coil over supplemented by a 4.0 bypass shock each with some pretty dope valving. that pair of shocks alone is going to necessitate 200lbs minimum to even start to drive the piston. there is SO much fluid and nitrogen in that shock that no amount of valving is going to change fluid dynamics. then you have the springs which are probably going to be something like a triple rate 50 over 250 over 350lbs/in (just throwing numbers out)
the numbers start adding up
so - end result is that the automatic transmissions that IFS/IRS rock buggies use get REALLY stupid hot really fast because of all the load that is placed on the torque converter and clutch packs.
its just an inherent part of the independent suspension, kinda like how a quadra-coil inherently needs sway bars. theres an explanation, just not one that is easy to grasp or visualize.