Rich-good to see the final product installed on an XJ! Looks good, send me some more pics of different angles when you get a chance.
I was kinda bummed about the end cost on it but I really wanted a product I could trust in 100%. The shoulder bolt alone is 25% of the cost but it's also a critical component. A standard bolt doesn't have the precision fit or near the strength.
In all honesty, I was leary about those two support bolts myself when designing it. The first prototype I built we wanted to see how much stress was on those. So initially we used 1/4" bolts figuring they would shear off with a 10 foot long swingarm and nearly 400 lbs bouncing up and down on the end of it. They did. Upsized to a 3/8" and they worked fine so for the final I went with 1/2-20 x 1" long bolts. The round tube they thread into is 1" x 5/16" wall DOM. We incorporate those braces into the taillight filler panels of our bumpers.
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So far I've heard a lot of positive feedback about it. I know compared to the spindle/bearing setups you see on the market, there is no comparison. I hope that doesn't come off arrogant but I've used those spindles for years and they flex, this setup doesn't. Not to mention the complete random failures of those spindles....that's a sickening feeling to see.
Sorry to hijack your thread Rich!