[Grady Clay]

“Very nice documentary.

I have a '71 911/01 Trans and am wondering about this. First, a couple questions...

Are there any symptoms that this kind of wear is occurring?
None

I am having trouble picture what is wearing those bolts like that. Where do they go and what is causing that wear?
The wear is when the differential is “differentiating,” ie, one axle is at different speed from the other.
JA,

Why do the replacement bolts appear to be shorter than the originals?
They don’t have tits.

Is there any reason not to replace that roller bearing while you are in there?
Never do that without resetting the major transmission specifications – pinion depth, R&P back lash and differential bearing pre-load.

What function does the armiture perform? Does it exhibit any difference in driving after you install that piece, or is it simply a "bracing" apparatus?
It simply helps to prevent destroying your transmission.

Best,
Grady