ALU trailing arm upgrade 69E ??

[Bobboloo]

Thanks Warren good data point to know.

[911pcars]

I'm not sure this has been verified, but perhaps inner 4-bolt CV joints can be used with outer 6-bolt joints. I think the axle splines are the same.

Can someone verify?

"We make the following modifications to the arms and shocks: 1- cut down the dust sleeve so it just caps off the rubber bump stop...."

Rather than preform surgery on the dust cover, I just removed them for the needed clearance around the rear shock tower (Koni Sports). This may or may not be necessary with narrower shocks.

Sherwood

[midlife]

Interesting thread.

I have aluminum arms on my '69. (Not my install.)
The shock dust covers are rubbing on the shocks. It looks like I need to remove them.

Thanks for the great info.

[Bobboloo]

I'm not sure this has been verified, but perhaps inner 4-bolt CV joints can be used with outer 6-bolt joints. I think the axle splines are the same.

No go. The splines match but the diameter of the 6-bolt flange is smaller.

I also checked to see if you could have an axle with a 6-bolt CV on one end and a 4-bolt on the other. This also doesn't work because the axle diameter of the 6-bolt is also smaller.

[Zeke]

Originally posted by midlife
Interesting thread.

I have aluminum arms on my '69. (Not my install.)
The shock dust covers are rubbing on the shocks. It looks like I need to remove them.

Remember that the top of the dust cover is a functional part of the mount. That's why Dave cuts them real short as opposed to removing them altogether. If you can find a thick washer the same ID and OD as the top of the cover, you can susbstitute that. That's what I did. It really doesn't get all that dirty way up inside there unless you drive a lot of dirt roads or something like that. I was going to remove the fronts too, but thought better of that since a lot of things bounce around in the front wheel well and could nick the shaft of the shock.

An added benefit to exposing the shaft is to use a ty-wrap on the shaft to guage total compression, or total travel. You'd probably find that you use it all anyway. But for a short skid pad test.............

[911SCfanatic]

Remember, there was a structural change to the rear cross member in 1972. I think the shock interference issue is limted to pre-72 installs. I've reviewed many threads and only the pre-72 people seem to complain about the upgrade relative to the shock issue. Can someone confirm this?

[randywebb]

think that's right....