CA All Day Posted June 14, 2012 Report Share Posted June 14, 2012 Being a newb, I wasn't sure if 620 and 521 upper control arms were the same so I took a chance. Looks like they're identical. 620 on the left, and 521 on the right. Only difference are the left has zerks. Right doesn't, not sure why. Quote Link to comment
CA All Day Posted June 14, 2012 Report Share Posted June 14, 2012 Bottom 620; top 521 Quote Link to comment
CA All Day Posted June 14, 2012 Report Share Posted June 14, 2012 I haven't compared the outer bolt diameter yet though. Have to measure tomorrow... Quote Link to comment
CA All Day Posted June 14, 2012 Report Share Posted June 14, 2012 More pics for reference... Quote Link to comment
CA All Day Posted June 14, 2012 Report Share Posted June 14, 2012 I didn't get to post pics properly last time of my problem. Here it is for reference. Threads were eaten up, poor lubrication is most likely the case (no zerks!)... Quote Link to comment
CA All Day Posted June 14, 2012 Report Share Posted June 14, 2012 Other end of upper arm shaft... Quote Link to comment
CA All Day Posted June 14, 2012 Report Share Posted June 14, 2012 It was so bad it caused the mating nuts on both arms to disengage from threads and spread the arms apart wider, causing an inward wheel camber ~5/8" from the vertical. Also truck tend to veer to the right. Hopefully this fixes the steering problem. Lesson here: Lube it up! And keep it lubed! Quote Link to comment
mklotz70 Posted June 14, 2012 Report Share Posted June 14, 2012 Wow....I retract my earlier comment about them not wearing out. :) Quote Link to comment
Cheeks91932 Posted November 3, 2013 Report Share Posted November 3, 2013 Can I get some help finding upper shaft link needed for ball joint conversion on a 520... Quote Link to comment
wayno Posted November 3, 2013 Report Share Posted November 3, 2013 Can I get some help finding upper shaft link needed for ball joint conversion on a 520... There is no conversion for a balljoint 520, you have to fabricate everything. Quote Link to comment
Cheeks91932 Posted November 3, 2013 Report Share Posted November 3, 2013 I ordered a custom upper control arm.. Was told rest of my parts would be pulled from a hardbody.. Just the upper shaft link I can't seem to find.. I was also told needs to be off a 79-81 truck.. Quote Link to comment
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