The reason why the uppers should be shorter than the lowers is so that as the rear axle mover away from the frame the links the anti squat will become less.
So that if you start to climb with a certain amount of anti squat which will cause the rear axle to move away from the frame this movement will then reduce the anti squat value which lessons the tendency for the axle to keep moving away. This results in a more stable setup which will hop less on the steep climbs. It actually lets you run more anti squat at ride height so that you can get a good horizontal launch while still remaining stable on the steep climbs because the anti squat value will lesson all by itself.
If the links are all the same length as the axle moves away from the chassis the anti squat will increase which will cause the axle to move away more and the only way it can stabalise is by the extension on the rear springs (meaning the rear springs will extend more than if you ran short upper links).
I wouldnt be too concerned with the pinion angle changing - thats what uni joints are for. Probably should run a loose centre limiting strap to stop the rear from totally dropping out anyway.
Land Rover SIIa, 302W, NP435, NP205, MOG404s, 42in Swamper TSLs, 112in WB
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