View single post by Mark Rosenbaum
 Posted: 04-20-2006 04:18 am
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Mark Rosenbaum



Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
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 According to my notes, the upper arm bolt (JH P/N 91290) is 1/2"-20 UNF x 9.13" Grade 5.  The flat washers (91323) and lock nuts (91324) are also Grade 5.  As these were initially Vauxhall parts, your local GM parts counter guy might be able to thumb through an old paper catalog and find something usable.

If bolts of the correct length can't be readily obtained, you could try using Grade 5 threaded rod secured with a lock nuts at either end.  In this case I would strongly advise the use of cotter pins to keep the nuts in place.  Also, I'd expect that the threads would cut through the bushings' metal inserts fairly rapidly, so this is really just a temporary fix rather than a permanent replacement.

I'll caution that using Grade 5 or stronger hardware is essential.  Weaker hardware will fail with potentially lethal results.