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I broke the "ears" off one set of stock 727 pump gears also. It happened during the Mopar weekend about 2008, during time trials.
With the help of a couple racers, we pulled the trans, took it apart, found some new pump gears at a vendor; and I made the first round of eliminations.
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I sheared the pump lugs/ears driving up the freeway , trans shop asked if I had any backfires . None , I think after 15 yrs use it was bad luck . But it filled the trans and cooler with metal . So I bought billet gears and a super sprag as upgrades . Footbrake low mid 10s . I do have a Griner vb .
Tex