08-08-2011, 04:28 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
It's a shipping protector.....
All Tremec boxes have them. Most of the time when people get the transmissions, they just shove the slip yoke into the end of the transmission and it pushes that donut further onto the mainshaft. You can leave it out.
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