Interesting article that includes some great info on why you want to have the shank of a bolt (instead of the threads) most of the way through a double shear joint.

https://www.fastenal.com/content/feds/p ... Design.pdf

Um yeah, totally love this geek stuff. Now just wait until one of those acft mechanic types gets a hold of this.

Edit: Further reading for those who would rather not count sheep.

http://www.fastenal.com/content/documen ... eGuide.pdf

"YAWN" well Kirk, we live by this stuff on all the aerospace vehicles. everything from the skin fasteners to the pins that hold the big stuff on. If you want to get into some real nerdy stuff. Start reading about carbon fiber reinforced plastic. (cfrp) Thats what the entire 787 (dreamliner) is made of.

I would love to take a class, maybe from a fabrication standpoint, on different materials that would be applicable to modifying our rigs.

x2, if only to get a sense of what is actually important. From an engineering standpoint, we use some really neat stuff. For example, a RuffStuff 1.25" heim is rated for 78,000lbs before is starts to deform. That's ridiculous, and I suspect lots of rigs wind up with extra weight because we're overbuilding things.

I'd love to learn more, when I'm thinking of material and fastener choices I usually look to what exists on my bronco and its application. If it's survived for 40 years on my rig and I make similar choices the fab work I've done should last at least another 40. A bit Red Neck, but I won't pretend that I can outthink a Ford engineer from the 60's & 70's.

What size bolt fits in the bushing? 1/2"? I run whatever fits there in grade 8.

The big 'ol bushing above uses a 9/16" bolt, and most of JJ style hybrid joints do as well, even for 1.25" shank. The front joints in my radius arm run rubber bushings, so I'm not convinced it's worth swapping out for my application.

On another note, I discovered last night that the BOB (big 'ol bushing) is too wide. Anyone have suggestion for a 2" wide bushing? I may just weld in a 2x1/4" piece of DOM and use chevy leaf spring bushings. I'd have to cut them down, but that's easy.

http://www.metalcloak.com/2-5-8-ODx2-5- ... p/7320.htm

Are you looking for a bushing to use in the stock track bar? Or one with a threaded shank like the pic you posted?

http://www.metalcloak.com/2-OD-x-2-W-Du ... p/7302.htm

without a shank, could be welded directly on like the Chevy spring option.

9/16"(14mm) is common for track bar bolts are on vehicles weighing 4000-5500lbs. The new Dodge 1-tons are up to 18mm.

One thing to keep in mind regarding bushings and their bolts, the bolt should not be considered to be stressed in sheer. What keeps in the bushing in place is the friction between the inner metal and the bracket as a result of the compression forces created by the bolt. This is why some bushings are serrated on their ends, so that they mechanically key into the bracket, assisting the friction forces.

I'd love something with a threaded shank so that the bar can be adjusted without removing it and to give a broader range of adjustability, but I don't know that one exists. I'd love to run that Metalcloak joint, but I'd need something with a 7/8" shank. That 1" shank is an odd size that I can't find a bung for. My worry with the non-threaded one is that I'd be limited to only Metalcloak's products, as I'm not sure anything else is made to fit the housing they provide. I'm hoping to find a solution that gives me easy access to parts in the long term. I'm thinking about something like these: http://www.synergymfg.com/Synergy-Dual- ... IdXbNLF_nI. I'd have to figure out a sleeve to press them in to, but I like the dual durometer thing. I'd also have to drill out the 1/2" sleeve to 9/16, but that isn't a big deal. The fact that they're stock replacement for a Jeep would give me an easy option long term.

Digger, Im gonna pick your brain about radius arms so be prepared for some PM's.....

Dude! Thanks! A pair of those, some metalcloak joints, and I'll have me a sweet track bar.

Just dumb luck. I was just looking at Johnny Joints because Zoso mentioned them, and they make a joint with a 1" shank.

I need to decide if I want to use a Metalcloak joint on the frame end of my trackbar. I'm still using the stock poly bushing on the axle side. I have an extra new Ruffstuff heim & bung I was going to use, when lengthen my track bar. But I really would like to put a bushing back in. We'll see.

Here's some 7/8" shank bushings:

http://www.ballisticfabrication.com/Bal ... _1646.html

http://www.ballisticfabrication.com/For ... _1944.html

Synergy:
http://www.polyperformance.com/shop/Syn ... 16605.html
And sleeve:
http://www.polyperformance.com/shop/Syn ... 28753.html

Looks like Ballistic has a 1" threaded insert, cheaper too.

http://www.ballisticfabrication.com/10- ... _1405.html

JD, thanks. I actually have the first one you posted. The challenge is that none of the off the shelf stuff fits with the combo of 7/8" shank, 2" wide mounting width, and 9/16 (or bigger) bolt size I need. I'll either do something with a 1" shank or a welded sleeve like the Synergy stuff you posted and just cut down a longer bushing. Not sure which is the better option. Gunni, thanks for the link, not sure how I missed that one. I've spent a ridiculous amount of time on Ballistic's site.

That's a huge bolt, who made that heim? Most 1.25 shank heims use a 3/4" bolt-my Ruffstuffs came with 3/4" grade 8 from Battlement. To shim it down to 9/16 I'd seriously consider using these: http://www.ruffstuffspecialties.com/catalog/FIXIT.html, although they're not 100% useful if it's actually a 1" hole.

The heim & bracket from Bloody Knuckle were for 1" hardware (no high misalignment, just tube spacers). They've been removed. I'm guessing they are Ruffstuff heims. Their 1.25" heim is built for a 1" bolt, but they offer misalignment spacers for 9/16", 5/8" & 3/4" bolts.

The Ruffstuff bracket & Metal Cloak bushing are for 9/16", these are what I'm using. I'm thinking 9/16" grade 8 should be ok, but wanted a more educated opinion on the matter. They are pretty important to the whole steering/driving thing.

Sorry if I wasn't clear.