I could see having them towards the shackle making a slight difference, since the axle moves in that direction as it cycles.
Enough to feel the difference, doubtful.
Any angle of the shock will lessen Its travel, also lessening Its ability to do Its job. My rears angle in toward the center of the jeep about 20 degrees for maximum travel. It also gives it a softer ride.
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78 CJ7.. 258.. TH400/Dana18.. SOA/stock YJ springs.. 35" General Grabbers.. Waggy 44s.. 4.88 gears...Spartan/Lockright...Fiberglass front to rear