The importance of measuring bell housing runout.

I’m planning to swap to a 4 speed this winter. The 5.9 magnum that’s in the car isn’t drilled for the input shaft. I have a spare engine that I tore down on the stand and figured I could use it to get measurements to pre cut the input shaft. Got everything bolted up and my spare was drilled (completely spaced checking it first :BangHead:)
Hoping this old lakewood scatter shield comes out somewhat close when I measure the runout :thumbsup:.
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