Just out of curiousity, would anyone know what the spec is for excessive backlash or whatever they call it. (set parking brake, turn driveshaft full CCW, mark it, full CW, mark it)
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Lube oil of any sort (new, old synthetic or dino) would never prevent that hogged out metal shown in the pictures! I would think the bearings would have failed if lube quality was poor.
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Yes and no, I believe some of the redline products (shockproof line) are designed to lighten the impact on the teeth in instances like that. The setback is mainly that the heavy shockproof gets so thick when cold out. I believe it is the viscosity of a 80w90, internal friction of a synthetic 75w90, protection of a 300w oil!