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Discussion Starter · #1 ·
Who makes 9/16-18 double-ended threaded studs that are 4" long (an inch longer than the stock GM studs)? Offroad Unlimited makes some (click here) but they're for use with a 3" spacer ( <IMG SRC="smilies/eek.gif" border="0"> ). I'm only using a 1" spacer. I've found 9/16-18 all thread, but I need the non-threaded center portion for the cone washers to seat on (just like stock GM). I asked a machinist about making one from a grade 8 bolt and he wasn't too crazy about it. Anybody know where to find these elusive studs?

PS
I have three new, stock GM studs for sale if anyone wants them <IMG SRC="smilies/rolleyes.gif" border="0">
 

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Try McMaster Carr. I would check for you but my catalog is on a job.
Try checking with Steve N. he used to sell bolts.
 

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Discussion Starter · #3 ·
I checked McMaster first followed by MSC Industrial Supply and Reid Tool Supply. No luck <IMG SRC="smilies/frown.gif" border="0"> I sent an email to Offroad Unlimited but I'll call tomorrow too and see if they make shorter ones.
 

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Originally posted by Donovan:
<STRONG>I bet that they have ARP build them. Maybe you can call them and get a price on them. http://www.arp-bolts.com/</STRONG>
Yuppers from ORU's website

This kit consists of 3 a.r.p. steering arm studs. These studs are constructed of 8740 chrome moly steel and heat treated to 190,000 psi tensile strength. Kit includes 3 studs, 3 "c"-lock nuts and lock tight. For use with 3" steering block only.
I would also check w/ ARP and see what they can do. If they make custom ones be sure they are true. On more than one occasion I have had bolts (head bolts) and studs from them that were not straight. My neighbor had head studs from them that weren't true also he had a hell of a time getting some that were. I love their products dont get me wrong but buyer beware! <IMG SRC="smilies/biggrin.gif" border="0">
 

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Discussion Starter · #7 ·
Just got off the phone with ARP and I have good news for those of you who haven't already tapped your knuckle ( <IMG SRC="smilies/rolleyes.gif" border="0"> ). They stock studs in 3.475", 3.62", 3.75", and 4.10" lengths with a minimum of 1" of thread on each end. For example, the 4.10" stud has 1.1" of thread on one end and 1.25" of thread on the other. Cost for that stud is $5.81. Now the catch... why did I say "for those of you who haven't tapped their knuckle"? Because these studs are 9/16-12 UNC on one end and 9/16-18 UNF on the other. GM used 9/16-18 on both ends of their studs so to use the ARP studs you'll need to find a 9/16-12 nut. ARP doesn't make high-strength nuts in that thread, only standard grade 8 (with nylon locking if you wish). I'd prefer to use a 9/16-18 nut if I can so I called their manufacturing department and they're working on a quote to manufacture a 4" stud with 1" minimum 9/16-18 thread on each end.

So... if you haven't tapped your knuckle yet then I'd tap them as 9/16-12 and use ARP studs with their high strength 9/16-18 12 point nuts. If you're using a stock GM knuckle or have already tapped your knuckle to 9/16-18 then you can either grade 8 locking 9/16-12 nuts on ARP's studs or have them custom made (I'll post that quote when I have it).
 

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I have one of those 3" D44 steering arm spacers and it uses 9/16-18 for the knuckle and 9/16-12 for the top threads. It came with the same "stover" nuts that GM uses, but in 9/16-12. I don't see why you can't find some of those "stover" nuts in 9/16-12 and call it good.
 

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Discussion Starter · #9 ·
Update on the custom studs from ARP. Recall that I had requested a quote for 4" studs with UNF threads on both ends. You sitting down? $35.06 a piece <IMG SRC="smilies/eek.gif" border="0"> I'll pass, UNC nuts and the $6 studs will work just fine for me <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0">
 

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Come on Eric put that engineer mind to work. Having the fine thread part of the stud in the knuckle will be stronger. The part of the stud that will fail in shear is the very top of the thread that is threaded into the knuckle. the fine thread is stronger because there is more cross section left, since the threads aren't as deep. I know we are hoping that the studs are tight enough that friction between the arm and the knuckle prevents the studs from being loaded in shear, but that is an optomistic assumption.
 

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Discussion Starter · #11 ·
Thought I'd share an update on this now that I've received my ARP studs. Here's a pic showing the stock 3" GM stud next to the ARP 4" stud:
<IMG width=190 height=223 SRC="http://www.pirate4x4.com/ubb/uploads/GM_ARP_stud_compare.jpg">

The part number for the ARP stud shown is AQ4.10L and list price is $5.81 each. I also purchased 9/16-12 lock nuts from McMaster (center lock, deformed-thread, zinc plated, grade 8) at $7.16 for a pack of ten (part number 90636A066).

See my post above about some of the different lengths they have available. <IMG SRC="smilies/beer.gif" border="0">

[ 11-02-2001: Message edited by: Eric Ruhl ]
 
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