Lower Control Am U Bolt question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1972BackInBlackC10** · 12-18-2019, 03:49 PM

Will lower control arm bolts from a square body chev work on the 67-72 lower control arms? The one im wondering about are in this link below, it says the thread size is 9/16-12 in. and the length is 3.250 in.Iv seen posts where people have been using the larger 9/16 size but im not sure if these are the ones since I cant seem to find much for u bolts

https://www.summitracing.com/int/par...on/front-lower

**Jason Banks** · 12-18-2019, 06:12 PM

Dorman 13503.

Those are the ones I used. Had to drill out the holes to fit.

68 P.O.S. · 12-18-2019, 06:17 PM

Yes, 9/16 is the correct size to upgrade to for safety. The originals were 7/16 or 1/2 and there were problems with them snapping while in reverse with the wheels cranked all the way in either direction. I had this happen and it was a pretty scary drive.

bean · 12-18-2019, 11:06 PM

I used those as well on my 72. Didn't have to drill them out though.

Andy4639 · 12-22-2019, 10:31 AM

I've had my 71 for 37 years with the factory u bolts and never have had a problem with them. The ramp truck has them and no problems the 68 still has them also. No problems but it's not on the road yet though!

12-18-2019, 03:49 PM	#1
1972BackInBlackC10 Senior Member Join Date: Jan 2012 Location: Estevan, Saskatchewan Posts: 1,025	Lower Control Am U Bolt question Will lower control arm bolts from a square body chev work on the 67-72 lower control arms? The one im wondering about are in this link below, it says the thread size is 9/16-12 in. and the length is 3.250 in.Iv seen posts where people have been using the larger 9/16 size but im not sure if these are the ones since I cant seem to find much for u bolts https://www.summitracing.com/int/par...on/front-lower

12-18-2019, 06:12 PM	#2
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,519	Re: Lower Control Am U Bolt question Dorman 13503. Those are the ones I used. Had to drill out the holes to fit.

12-18-2019, 06:17 PM	#3
68 P.O.S. Registered User Join Date: Jan 2007 Location: Puyallup, WA Posts: 1,661	Re: Lower Control Am U Bolt question Yes, 9/16 is the correct size to upgrade to for safety. The originals were 7/16 or 1/2 and there were problems with them snapping while in reverse with the wheels cranked all the way in either direction. I had this happen and it was a pretty scary drive. __________________ 72 C10 lwb fleetside -stock 350/350 combo Last edited by 68 P.O.S.; 12-18-2019 at 08:15 PM.

12-18-2019, 11:06 PM	#4
bean Registered User Join Date: Jun 2002 Location: Fort Worth, TX Posts: 915	Re: Lower Control Am U Bolt question I used those as well on my 72. Didn't have to drill them out though.

12-22-2019, 10:31 AM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Lower Control Am U Bolt question I've had my 71 for 37 years with the factory u bolts and never have had a problem with them. The ramp truck has them and no problems the 68 still has them also. No problems but it's not on the road yet though! __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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