'66 Ford 5-lug Dana 60. It takes Timken Set 7 tapered wheel bearings (same as 8 3/4").

I have also seen this happen several times on 8 3/4" pickup rears. The non sealed design is prone to water contamination.

Interestingly, my Dad's other Ford pickup is still on it's original set of 1965 sealed, ball wheel bearings.

I do like the later model, set 20 tapered wheel bearings, however.

BTT..
Cass, I assume all your brake kits are based off of the mopar end correct?

Does ordering axles with the Ford style tapered bearings cause any fitment issues? I notice most of the aftermarket kits from Wilwood and such list the green bearings as a requirement..

Timken Set 20 (3.15") wheel bearings interchange on most Mopar axles. I as well as Strange, Dutchman and Mark Williams offer Mopar 3.15" hybrid housing ends.

My brake kits, axles and housing ends are available for std Mopar or 3.15" tapered (Ford) wheel bearings.

Drum brake backing plate ID must be bored to 3.16".

Most other Mopar brake kits only work with std Mopar Green wheel bearings.