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I would suggest not turning down the retainer.The difference in retainers from 4.35 ID to 4.80 ID with the bolt centers at 3.70 and 4.16 respectively, turning it down can create a weak(thin) area at the bolt centers and the drain back notch.If this retainer fails at the trans case the bearing can walk forward causing major trans gear damage.Bore the bell housing or get the correct bell.

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