Re: 66 Chevelle Malibu diff problems
To follow the above, my 66 came to me with a 8.2 in open 331 axle. I swapped it for what I was told was a 64 El Camino axle with a 373 eaton posi. My original 28 spline axles fit fine. Then one wore out, ie, groove on the driver side where the it rides in the bearing.
A set of Summit axles also fit fine.
Can you test fit the axles back into the old side gears to check?
Others here have more info, but there is supposed to be some difference in the 64 ten bolts concerning the axle splines. That may be your issue, but all my stuff has worked.
Also, make sure the side gears and small pinion gears are all properly aligned when trying to assemble.
66 Malibu Coupe, home rebuilt 350. Took me 39 years to get her!
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