The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Rubber bushings on upper control arm studs

**HO455** · 07-11-2019, 02:38 PM

I stand corrected I have never seen them available before. The reason for the cupped washers is to allow the alignment shims (Y shims) to sit at an angle on the stud. This happens when you have more shims on one of the studs than the other. (See 1st photo and the position of the nuts on the studs relative to each other. The photo is just an example. Ignore the large fat washers. Photo taken during the mock up stages of my suspension modifications. 2nd photo shows how much slop the cupped washer has to self align with the shims and then sit on the dome on the frame.) Without the cupped washers the shims don't get tightened down properly or can spread apart and fall out.
The Y shims are used to set the upper control arms in position when aligning the front suspension.

07-11-2019, 02:38 PM	#10
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,636	Re: Rubber bushings on upper control arm studs I stand corrected I have never seen them available before. The reason for the cupped washers is to allow the alignment shims (Y shims) to sit at an angle on the stud. This happens when you have more shims on one of the studs than the other. (See 1st photo and the position of the nuts on the studs relative to each other. The photo is just an example. Ignore the large fat washers. Photo taken during the mock up stages of my suspension modifications. 2nd photo shows how much slop the cupped washer has to self align with the shims and then sit on the dome on the frame.) Without the cupped washers the shims don't get tightened down properly or can spread apart and fall out. The Y shims are used to set the upper control arms in position when aligning the front suspension. Attached Images __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 Last edited by HO455; 07-11-2019 at 02:45 PM. Reason: Accidentally posted too soon. Curse these fat fingers.