Replacing upper control arm cross shaft studs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mplex2000 · 10-14-2009, 06:15 PM

The big studs on a 76-72 crossmember that the upper control arm cross shafts bolt to..

The rear one on each side of mine is very rotted away. After blasting, they're about 1/3 smaller than they are supposed to be

I see that LMC sells replacements but do they just press out? I whacked one with a hammer pretty good, but it wasn't moving and I don't think I can get this thing positioned on my press to squeeze it out.

Anybody done this before?

SCOTI · 10-14-2009, 06:29 PM

They just press out like stated.

cparman · 10-14-2009, 08:58 PM

there is a serrated/knurled edge close the the head of the bolt. That is there to hold the bolt from spinning when someone is trying to align the truck. If you can get a socket to the head of the bolt with an impact gun, you might be able to spin the bolt and get it to come out. Need to pull the new bolts in by tightening the nut to press the serrated edge in place.

mplex2000 · 10-17-2009, 12:44 AM

Argh, well my little 12 ton press is a tad small, I can't wedge the crossmember in there.

Hammered again, nothing.

Tried to use a big c clamp, cracked the clamp frame.

Ugh, I guess I gotta pay somebody to remove the dang things for me.

cparman: the bolt head is round, so unfortunately, if I had a size X round socket head, I still don't think it would work :P

UPDATE...Heated them with a torch, two handed swing with BFH, finally got them out. Thanks guys!

10-14-2009, 06:15 PM	#1
mplex2000 Registered User Join Date: Jul 2005 Location: DFW Posts: 463	Replacing upper control arm cross shaft studs The big studs on a 76-72 crossmember that the upper control arm cross shafts bolt to.. The rear one on each side of mine is very rotted away. After blasting, they're about 1/3 smaller than they are supposed to be I see that LMC sells replacements but do they just press out? I whacked one with a hammer pretty good, but it wasn't moving and I don't think I can get this thing positioned on my press to squeeze it out. Anybody done this before?

10-14-2009, 06:29 PM	#2
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	Re: Replacing upper control arm cross shaft studs They just press out like stated. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

10-14-2009, 08:58 PM	#3
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: Replacing upper control arm cross shaft studs there is a serrated/knurled edge close the the head of the bolt. That is there to hold the bolt from spinning when someone is trying to align the truck. If you can get a socket to the head of the bolt with an impact gun, you might be able to spin the bolt and get it to come out. Need to pull the new bolts in by tightening the nut to press the serrated edge in place.

10-17-2009, 12:44 AM	#4
mplex2000 Registered User Join Date: Jul 2005 Location: DFW Posts: 463	Re: Replacing upper control arm cross shaft studs Argh, well my little 12 ton press is a tad small, I can't wedge the crossmember in there. Hammered again, nothing. Tried to use a big c clamp, cracked the clamp frame. Ugh, I guess I gotta pay somebody to remove the dang things for me. cparman: the bolt head is round, so unfortunately, if I had a size X round socket head, I still don't think it would work :P UPDATE...Heated them with a torch, two handed swing with BFH, finally got them out. Thanks guys! Last edited by mplex2000; 10-17-2009 at 05:12 PM.

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