Revcon slantnose suspension - cracked lower control arm

[sploke]

Ran into a major issue today on the Revcon.  I was installing the new torsion bar adjusters.  Got them set and the ride height adjusted.  Pulled out of the driveway and *BANG* the front right side dropped about 4".  After some investigation, the hex socket in the lower control arm where the torsion bar sits, has a crack in it and it's allowing the torsion bar to spin when it gets enough weight on it.  Pulling the control arm off tomorrow to get a better look at what's going on and consider options....never seen anything like this before.

[Oz]

Damn. Definitely not your every day type of problem.

[Elandan2]

Maybe you could try Cinnabar Engineering. I believe the GMC motorhome had the same torsion bar setup.
https://www.thegmcmotorhomepeople.com/

[Elandan2]

Is this the part that is broken?

https://www.gmcrvparts.com/product-p/gm1-1.010.39.1.htm

[sploke]

No, I had already replaced the torsion keys at the back of the bars.  My problem is at the front end, where the bars socket into the lower control arms.

[Elandan2]

You could go with these. Expensive but it would cure the problem.
https://www.gmcrvparts.com/product-p/gm1-1.010.21.htm

[sploke]

You could go with these. Expensive but it would cure the problem.
https://www.gmcrvparts.com/product-p/gm1-1.010.21.htm

The later year Revcon arms are totally different from the GMC ones, they were custom Revcon items.

[sploke]

We opened up an access hole on the bottom of the arm to get at the broken part and repair it.

[Eyez Open]

Now that is going deep into recon. When that suspension fell was there secondary damages? Watching your work has put my efforts back into perspective, meaning I really don't have big issues other than a black money hole.

[sploke]

No, luckily I was only going about 5mph in reverse out of the driveway, so it snapped and fell, but wasn't going fast enough to do any other damage.