68 gmc c15 upper control arm bracket
 

Hi, 1968 gmc c15 swb step side. Front end was striped down and painted. Drop spindles and front disc brake conversion. I fabricated some upper control arm brackets for the cross shaft. The oem was all rotted and I used all the same geometry as the old.

I up sized the stud from a 1/2'' to a 9/16'' (grade 8 unf) and all the hardware is 9/16'' grade 8 unf on the vertical and 1/2'' grade 8 unf on the subframe. The cross shaft fits but it is really nice and tight. I'm afraid my good work will limite the caster adjustment. Worst comes to worst, i'll cut out the 9/16'' stud and weld some 1/2'' or I could radius the cross shaft bores to get my movement (different shim stack thickness).

I was also thinking about doing to bottom cross shaft mod (0.750'' to the front). What do you guys think about the bracket and my general idea for my alignment.

Thank you!

Nick.

Pardon my english! Canadian frenchmen fron New Brunswick here.

P.S. Sorry the pics are upside down. Trying to correct it. I trying fliping the pictures but nothing works. Sorry for your necks

Re: 68 gmc c15 upper control arm bracket
 

Depending on the welds that is probably strong enough but you might have trouble if it ever needs inspection?

These trucks like more caster, they did not come with much from factory back in the day when power steering was not so common.

I have a spare crossmember but I think we are several days drive apart

Re: 68 gmc c15 upper control arm bracket
 

Crossmember is all good. Didn't feel like paying 300$/each + shipping for some stamped steel crap. It's all 0.250'' steel. As for inspection, wont be a problem. Thanks for the reply buddy

Re: 68 gmc c15 upper control arm bracket
 

Drill the upper pivot out.
Use conical washers to make the angle up

Link

Morton - SP-2 Low Carbon Steel Spherical Washer Sets, Equalizing Washers, Inch Size, 1/2" Bolt Size https://a.co/d/6LqUz0o

Re: 68 gmc c15 upper control arm bracket
 

Wow I cant believe I missed those washer/spacers. I still have my old ones and drill them out for 9/16 fasteners. I'll measure the thickness and take it out of the spacers. Thanks!!

Re: 68 gmc c15 upper control arm bracket
 

Just finished the lower control arm cross shaft 0.750" forward mod.
I know its a sin but 10mm allen head bolt are 0.625" on the OD (perfect for a 5/8" endmill) and the bolt goes in the bore nice and tight. Enjoy. Hope the pics are not upside down

Re: 68 gmc c15 upper control arm bracket
 

More pics.

I dont underatand why they are upside down...

Re: 68 gmc c15 upper control arm bracket
 

Nice work! Rg

Re: 68 gmc c15 upper control arm bracket
 

Thanks buddy!

Re: 68 gmc c15 upper control arm bracket
 

You could move those forward .500 or .750 and get all the camber you're looking for

Re: 68 gmc c15 upper control arm bracket
 

Are you talking about camber or caster? I just did the lower control arm caster mod of 0.750" forward.