I have a bmr t56 xmember with torque arm mount. Where is a good starting point for the position of the tq arm mount. How do you determine when and how to adjust it.

 

Nobody knows how to adjust these things

 

Each increment is 1.5 degrees if I remember right. That crossmember points the trans waaaay down to make it a bolt on piece. I'm at like 5* tilt at the crank pulley with this same setup. Have to have an adjustable arm and that's still not enough.
Ideal degree is 2* less pinion angle than engine angle if you've got poly, less if it's rod end. Get a harbor freight degree finder and put it on the balancer, then the bottom of the torque arm plate.

 

You talking about the track pack style? You need to have the car weighted on the rear suspension like it is sitting on the ground. I think you position the bar so that the swing plate is standing vertical. Call BMR and ask them for yourself.

The adjuster at the axle side is simply to set pinion angle. Height adjustments at the front changes instant center of the suspension, which affects forward traction and braking traction.