The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 47-55.1 Crack in the cross member

mr48chev · 08-15-2023, 01:05 PM

Outside of the roads you have to drive on i'm wondering if metal fatigue caused that.

I'd be inclined to cut a plate that covered the whole corner of the crossmember with a hole for the bolt for the control arm to go through.

I'd be taking a hard look at and maybe replacing the strut rod bushings too. If the bushings are soft or loose that would let the control arm move.

Back a few years ago when you used the stock MII control arms with the aftermarket crossmember more often than not guys often heated and bent the strut rod to get it to a spot where they could weld the bracket to the frame and changed the geomentry of the control arm and strut' pivot points. The hole in the strut rod bracket should be Centered on line with the lower control arm bolt.

08-15-2023, 01:05 PM	#5
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,338	Re: Crack in the cross member Outside of the roads you have to drive on i'm wondering if metal fatigue caused that. I'd be inclined to cut a plate that covered the whole corner of the crossmember with a hole for the bolt for the control arm to go through. I'd be taking a hard look at and maybe replacing the strut rod bushings too. If the bushings are soft or loose that would let the control arm move. Back a few years ago when you used the stock MII control arms with the aftermarket crossmember more often than not guys often heated and bent the strut rod to get it to a spot where they could weld the bracket to the frame and changed the geomentry of the control arm and strut' pivot points. The hole in the strut rod bracket should be Centered on line with the lower control arm bolt. Attached Images __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.