Speedometer cable and the angle drive:, Speedometer cable has broken 2X by the angle drive Options

[PBC914]

I freshened up the transmission, and installed new seals in the speedometer drive side shift transmission on my 75 914.
After about 100 miles, the angle drive moved back toward the rear and bent/broke the speedometer cable.

I ordered a new cable, and moved and tightened the angle drive so it was facing toward the front of the car. After driving home today, it did the same thing and broke.

Is the angle drive supposed to be tightened so it can't move or is it supposed to spin freely when in place?

Anything else that could cause this condition?

Thanks!

[Richard Casto]

Is the angle drive supposed to be tightened so it can't move or is it supposed to spin freely when in place?

It is not supposed to spin like that when tightened. To me that is one of the indications of a bad angle drive. However, I suspect that most are like that at this point (so much so that people think it is normal), and they continue to work until the internal lubrication leaks out and they chew up the gears. That does seem to take awhile. So I think the angle drive is likely to be part of the problem, but maybe not all of it?

How are you securing the cable under the car other than the connection on the end (angle drive)? I would think that slack + the ability to move around = break.

Richard