U-Bolt Mod - Lower Control Arm - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**The Rocknrod** · 11-19-2015, 03:00 PM

Has anyone else complete the lower control arm 9/16" U-Bolt modification?
I seem to have no room to install the nuts properly. This thread in the FAQ section says to use a air hammer on the crossmember to make room. Is this what most people had to do? Cause I'm "thinking" about using a carbide grindning bit to make more room in the hole on the outside side of the crossmember. Thoughts, experiences?
http://67-72chevytrucks.com/vboard/s...d.php?t=599576

ProudSoul · 11-19-2015, 03:12 PM

I was able to get the ones towards the cab side in but I couldn't get the ones towards the front in. I would like to know a good way to dimple the cross member as well. I have the other 2 sitting in the garage, at least one beefier one on each LCA is better that 2 skimpy ones

Also, when I did this I had trouble fitting the u bolts through the holes I drilled. I had to use a jack to bend the u bolts a little to get them through.

**The Rocknrod** · 11-19-2015, 03:26 PM

I used a large vice, they were spread a bit I'll agree.

NVS-C10 · 11-20-2015, 03:23 PM

I did the upgrade on my 63.. I'll try and get pics this weekend. I had no clearance issues with the nuts and the crossmember but I was careful when opening the holes that I kept them centered between the crossmember wall and lip.

racecougar · 11-20-2015, 10:08 PM

Ditto. No clearance issues, no grinding, no air-hammering here.

**The Rocknrod** · 11-21-2015, 12:03 AM

Did you use a socket to tighten them down? Or a wrench, I can make a wrench tighten them down but wanted to torque them.

NVS-C10 · 11-21-2015, 12:54 AM

Quote:

Originally Posted by The Rocknrod

Did you use a socket to tighten them down? Or a wrench, I can make a wrench tighten them down but wanted to torque them.

I used socket

**The Rocknrod** · 11-21-2015, 08:37 AM

Must be a 64 thing. Even the panhard bar mount is better on a 65.

That FAQ article stated his was a 64 also.

racecougar · 11-21-2015, 09:44 PM

Quote:

Originally Posted by The Rocknrod

Did you use a socket to tighten them down? Or a wrench, I can make a wrench tighten them down but wanted to torque them.

A socket and a 1/2" drive torque wrench.

11-19-2015, 03:00 PM	#1
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	U-Bolt Mod - Lower Control Arm Has anyone else complete the lower control arm 9/16" U-Bolt modification? I seem to have no room to install the nuts properly. This thread in the FAQ section says to use a air hammer on the crossmember to make room. Is this what most people had to do? Cause I'm "thinking" about using a carbide grindning bit to make more room in the hole on the outside side of the crossmember. Thoughts, experiences? http://67-72chevytrucks.com/vboard/s...d.php?t=599576 __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

11-19-2015, 03:12 PM	#2
ProudSoul Registered User Join Date: Apr 2014 Location: Denison, Texas Posts: 63	Re: U-Bolt Mod - Lower Control Arm I was able to get the ones towards the cab side in but I couldn't get the ones towards the front in. I would like to know a good way to dimple the cross member as well. I have the other 2 sitting in the garage, at least one beefier one on each LCA is better that 2 skimpy ones Also, when I did this I had trouble fitting the u bolts through the holes I drilled. I had to use a jack to bend the u bolts a little to get them through.

11-19-2015, 03:26 PM	#3
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: U-Bolt Mod - Lower Control Arm I used a large vice, they were spread a bit I'll agree. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 11-20-2015 at 12:08 PM.

11-20-2015, 03:23 PM	#4
NVS-C10 Registered User Join Date: Mar 2014 Location: Rosemead, CA Posts: 419	Re: U-Bolt Mod - Lower Control Arm I did the upgrade on my 63.. I'll try and get pics this weekend. I had no clearance issues with the nuts and the crossmember but I was careful when opening the holes that I kept them centered between the crossmember wall and lip.

11-20-2015, 10:08 PM	#5
racecougar Registered User Join Date: Jan 2013 Location: Imperial, MO Posts: 1,003	Re: U-Bolt Mod - Lower Control Arm Ditto. No clearance issues, no grinding, no air-hammering here. __________________ Rod @ AzzKicker Cars 1965 C10 SWB - Build Thread

11-21-2015, 12:03 AM	#6
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: U-Bolt Mod - Lower Control Arm Did you use a socket to tighten them down? Or a wrench, I can make a wrench tighten them down but wanted to torque them. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

11-21-2015, 08:37 AM	#8
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: U-Bolt Mod - Lower Control Arm Must be a 64 thing. Even the panhard bar mount is better on a 65. That FAQ article stated his was a 64 also. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

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