Friction modifier
That's right Jeff, but his noise is in a straight line . That should mean ring and pinion. The Friction Modifier (available from Ford) added to the gear oil keeps the Traction-Lock from clunking and chattering when cornering. It's just a small little bottle of about 6-10 oz.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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