I have had quite a few Saginaws pass through my hands, but never heard of one like you describe.
On the MY6,other than the case,is almost identical to the Mopar 4 spd found in the Muscle cars. In fact the layshaft and bearings are interchangable.Never heard of oiling problems with those,they ar know for their durability behind big inch V-8's, but who knows.
Sometimes, the layshaft or countershaft gets loose in the aluminum case of the MY6, spits out the shaft retaining key, the shaft spins, egging out the shaft bores in the case.
