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I stand behind my statement that the lower bolts in your new front, "shackles" are too short. I can clearly see a shadow on the passenger side where there is space between the top of the nut and the bolt. Those bolts are too short, period. It's not a flame and you don't need to look at it that way. Just do yourself a favor and get some longer bolts so you can have sufficient thread engagement.
Besides, the shackle should not be riding on the threads anyway. It should be riding on the part of the bolt that has no threads, so even if that bolt was sticking through the nut slighly, it's still too short in the technical sense.
My intentions are only to help. I really like your truck but a simple hardware change to make the front of it safer is cheap and easy.
If you "grabbed them at work" they're probably not 9/16" bolts anyway. 9/16 is an uncommon sized bolt, typically you'll carry 7/16, 1/2, and then jump to 5/8, which means those are probably 1/2" bolts. If that is the case, although they're smaller, the bolts in the rear of the shackle are 7/16 so they'll probably be ok.
You asked how many nylocks I've used on my truck and the answer is none. My front springs have prevailing torque style locknuts on them.
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Well Jesus H. Christ, if you haven't learnt yet then maybe it's time to take a different approach.
Whatever the [darn] you're talking about with the bolts being too short-- you're wrong. If I wasn't heading out of town for work in 4 hours I'd take some pictures of the bolt on the passenger side all by itself, take it out, send it to you and expect you to shove it where the sun doesn't shine. There are a full 2 threads showing past the nut. Now, for whatever reason you can't see that on your side of the internet and that's fine, but I fully know how to screw a nut to a bolt...
Oh, and where I got those bolts? Yeah, there's 6500 other people working there as well, and they have a free issue bolt bin that stocks everything from 3/32x1/4" machine to 3"x25". Grades 3, 5 and 8, coarse thread, fine thread, coils, locks, flat and even star washers. Nylock nuts, stover nuts long nuts, jam nuts and regular nuts. Right hand thread and left hand thread. They have the same in metric as well. It's a room about 120'x120' full of shelving about 6' high that is strictly every kind of nut and bolt you can think of. Aluminum nuts and bolts that are bare, coated and anodized red and yellow. Nuts with with wire inside them to wire them down, nuts with springs inside them to hold them tight, square nuts and hexagonal nuts, 12 sided bolts and nuts dude the list goes on... Anyways... There is 4 rows of shelving about 4' deep strictly dedicated to 9/16" as it's a common size (as opposed to a 3" bolt, which is not) So don't tell me about where I work and what bolts they may have...
And as far as the shackle riding on the threads? Oh well. I'd be willing to bet I could take a length of 9/16" ready rod, not use nuts at all and leave the rod in there for a year of use. At that, out of the dozens of GM vehicles I've worked on, most had the rear shackles riding on the bolt threads...
I have a question for you- In your most recent post to me, how come you had shackle in quotation marks? Are they not shackles?
