Arm U-bolts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ERASER5 · 07-11-2008, 03:08 AM

I am getting ready to install 73-87 A-arm and disc brakes on my truck. Many time I have read that you should use the larger 73-87 U-bolts. So how did some of you re-drill the holes? The center to center distance is different on the large bolts. Just drilling will not work unless you really make hole big. Did you slot the holes? If so, how? I have some ideas of my own, but I tend to over think things and make it harder than necessary.

ERASER5 · 07-12-2008, 01:53 AM

Ttt

Zeke · 07-12-2008, 01:46 PM

I used 73-87 u bolts when I changed my 69 over. They are bigger but I didn't have to redrill any holes. They were spread more than the 69's but I just put a couple of nuts on them to protect the treads and tapped with a hammer so they would go through the holes. Had to get them about 1/8 inch closer together.

ERASER5 · 07-12-2008, 02:21 PM

Wow! I never thought of that. I'll give it a whirl.

ERASER5 · 07-12-2008, 07:16 PM

Zeke, you rock man! A little squeeze in the vise and the big bolt fit perfectly!

07-11-2008, 03:08 AM	#1
ERASER5 Registered User Join Date: Jun 2006 Location: Indiana Posts: 4,859	Arm U-bolts I am getting ready to install 73-87 A-arm and disc brakes on my truck. Many time I have read that you should use the larger 73-87 U-bolts. So how did some of you re-drill the holes? The center to center distance is different on the large bolts. Just drilling will not work unless you really make hole big. Did you slot the holes? If so, how? I have some ideas of my own, but I tend to over think things and make it harder than necessary. __________________ '70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60

07-12-2008, 01:53 AM	#2
ERASER5 Registered User Join Date: Jun 2006 Location: Indiana Posts: 4,859	Re: Arm U-bolts Ttt __________________ '70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60

07-12-2008, 01:46 PM	#3
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Re: Arm U-bolts I used 73-87 u bolts when I changed my 69 over. They are bigger but I didn't have to redrill any holes. They were spread more than the 69's but I just put a couple of nuts on them to protect the treads and tapped with a hammer so they would go through the holes. Had to get them about 1/8 inch closer together. __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

07-12-2008, 02:21 PM	#4
ERASER5 Registered User Join Date: Jun 2006 Location: Indiana Posts: 4,859	Re: Arm U-bolts Wow! I never thought of that. I'll give it a whirl. __________________ '70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60

07-12-2008, 07:16 PM	#5
ERASER5 Registered User Join Date: Jun 2006 Location: Indiana Posts: 4,859	Re: Arm U-bolts Zeke, you rock man! A little squeeze in the vise and the big bolt fit perfectly! __________________ '70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60



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