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Old 09-04-2020, 08:33 PM
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Here are photos of the side view and end views with correct alignment and incorrect alignment. I was incorrect in stating that the side view changed with incorrect matchups compared to correct. The alignment stays the same regardless of alignment. But the end views change quite a bit. When correctly aligned with "Forward to Increase" being matched up on the same ends. That results in the end gap matching up the same on both ends. However, when mismatched, the end gap is narrow on one and wide on the other.

Is the purpose of this alignment option to adjust the pinion angle to the drive shaft? Doesn't seem like anything they would have used on the assembly line though as too time-consuming.

There also is a #3920213 on the bottom half piece. Could that be the Pontiac part number for use on the 1967-1969 Firebird? I also assume this piece was used on the 1968-1974 Nova's with low horsepower drivetrains. That brings the question of when did Chevy quit using the mono leaf spring on Nova's. I assume they still used them in 1970.

Loren
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