Anyone know the measurements for a Beast chassis from the engine plate to the axle for squaring.

It could be anywhere from 30-34 most likely, but it isn't needed to square one anyway. Bob

Did you cut the new torque tube to match the old one? Did you have to change rear arms from what you had before? What is the problem?

Didn't change arms they were the same ones, took old tube up to ACRO and had one machined from the old one was assuming they were the same length, should I take it back off and check measurements

Length should be right if measured against the old one.

Should be able to just hook up the bird cages to the arms, and let it down with weight on it, and it should be close enough to get a measurment on, then you can square off that for your radius rod lengths, birdcages should be straight up and down, with the weight on them. Bob