While we are reviving this old post, I think this stuff on weak PM rods is a load of bunk.
The powdered metal process was introduced to make complex parts with the same physical properties completely through the part. There are many advantages to the PM part, not the least of which is resistance to distortion and a probable increase in fracture toughness. The powder fragments are compressed into the shape of the part and then heated up until they fuse together. They will tend to be more brittle than regular cast or forged rods. Any load that is stong enough to break them more than likely WILL break them rather than be dissipated by flexure. The cast and forged rods can bend a little more elastically to spread out the loading of the force.
So, powder metal parts should be able to offer superior properties to cast rods, but ultimate strength is still less than that of good forged rods.
If this means anything, then it is highly unlikely that distortion of the rod is causing the bearings to spin.

Maybe they just need to increase the detent tab on the bearing that locks in it place within the rod?


Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black