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If the spring perches are going to be changed, it's vital that the angle at which they're mounted isn't altered unless you want to dial-in a different pinion angle for a specific purpose, like drag racing. The rear needs to be supported accurately. We used some heavy jack stands under the axle tubes and set the angle with a screw jack against the machined flat where the pinion snubber mounts. We set the rear so the original spring pads were level.