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Wow, what a mess! Glad you're back in the Hummer fold.

Thanks for joining, Hirsch! Will you be our guide in town?

Good point about the top plate and the strength, I forgot about that. You could also build some storage compartments for those um, "shopping" trips across the border. :)

That looks really wide, like gangster-era running boards. I think most truck running boards are about 5"-6" and that seems about right to me, and would still provide plenty of place to step, and lot of protection. You might want a cross brace (diagonal from outside corner to first brace) to...

What he said. https://smile.amazon.com/4Pcs-Aaron-6ohm-Load-Resistors/dp/B00L4V9ECY/ref=sr_1_3?crid=2ICB6VCKO4V12&keywords=hyper+flash+resistor&qid=1664820819&qu=eyJxc2MiOiI0LjY5IiwicXNhIjoiMy4zMSIsInFzcCI6IjIuOTUifQ%3D%3D&sprefix=hyperflash+r%2Caps%2C160&sr=8-3

Awright, you likely have two issues. 1) Passlock is not working properly and a component of the ignition switch needs to be replaced. Not a difficult fix, just search for Passlock issues on H3s. As for the check engine light, we'd need to know the actual codes. Any shop should be able to provide...

Did you get the specific codes? You might be able to get away with a cheater/spacer in the downdraft O2 sensor that pulls it out of the exhaust stream. I'd start there, unless the codes you received conclusively indicate the cats. (Note that I said the codes, not the dealer! :) ) You might have...

All of the cats are bad? What symptoms are you having that got them to this diagnosis? I can't recall how many cats the Alphas have. Is it 2, 3, or 4?

PreferredChassis and his grandson built a great one, a Tube-zuki with a 4.3V6

Welcome to H4O!

Might be worth trying the camshaft position solenoid. Hate throwing parts at it, but at least it's not an expensive part.

I wonder if I could use this on the street to keep the bad drivers away.

Spark plugs are a good idea. Clean the MAF sensor. Clean the throttle body. Check the stubby little rubber hose that goes from the valve cover to the air box (effectively the PCV though it's not exactly that) to make sure it's connected and holding. You didn't mention any codes so is it correct...

Batteries last ~2 years in Phoenix. I was hoping AGMs would last longer but I don't think they do, or at least not measurably longer. I put in new AGM batteries Dec 2017, Jan 2020, Nov 2021.

And at the expense of the steering rack

Welcome to H4O!

First, you can run your H3 in 2wd by putting it in 4 high lock (the middle button) and removing the front driveshaft. Second, I'm guessing they are putting in aftermarket CV joints and they simply don't last long. An AC Delco driveshaft will last longer, but that's still not the solutoin. You...

I often get about 22-24 mp2g.

I don't really know anything about the town. We're staying here: https://goo.gl/maps/c587wVTNgAko7NbZ8

A single XL is available, no XXL I can print some shirts if needed, and if there is a demand. I'd like to know if we should stick with black or choose another color. I can also start a new thread on this.