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Alright, so I bought a Suburban and it has a 700R4 and I've never worked with one...It has a thing underneath the output yoke that looks like a donut with rivets in it. Probably has about 6 or 8 around it in a ring. What in the hell is this thing? Just wondering if any of you know what this thing is.
 

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It sounds like you are describing a damper. They hang a weight off the tailshaft to absorb drivline vibration by canceling the harmonics. Ford does that on almost all their Explorers, etc. Sort of a PITA to work around sometimes - and just adds extra weight.
 
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