The objective is to have both pinion angles parallel to each other under load and keeping the driveshaft center line as close as possible to centered to them. Perfect Example would be the chassis level, the trans tail at dead zero, the driveshaft level and the pinion at zero. Lets say the example here is a ladder bar car. Now adjust the pinion down 2 degrees, so on the hit, the bars will rotate up that 2 degrees and will put the drive line back centered and in perfect harmony. 4.5 degrees down angle at the trans is a ridiculous amount to even get close to getting the pinions correctly parallel. With that amount the pinion needs to be at 2 to 2.5 degrees up angle and on the hit it will roll up to the 4.5 degrees to get back to parallel. With that, the driveshaft is all sorts of out of center with the pinions. This will cause bad vibes and breakage and possible injury to you and car. Rossler transmissions has a good diagram on their site as to proper setup. hope this helped. Peace!
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