From what I remember most of the BOP 10-bolt failures around here were caused by the case spreading and allowing the pinion and ring gear teeth to end up at the bottom of the case. Never saw a 4-pinion carrier fail, but any failure point is a failure of the 10-bolt.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon.
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