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Who Is the "Go To" For Prebuilt 3rd Members

I just rebuilt a 9" (10") front diff from a 4400 car that cam from ECGS. Not exactly what I would call stellar work, load bolt scraping the spool, ring gear hex bolts that were too big hitting the load bolt even though they had been sanded down with a hand grinder (which had gouged the back of the ring gear).
That's the only experience I have with something they built, but I'm not sure about them anymore. They seem to have a decent reputation though.

I don't have exchange diffs anymore but I'd still build em (I'm in TN)
 
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