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Service or parking diaphram? I heard they changed through the years too.

Pretty sure A1 trucks have the button for injection, although likely some interlocks?

With yours, since it's not a A1R, you have a switch correct? Not sure what it will allow/not. Mine is totally ECM controlled and I have no ether button on A1R. The NAPA cylinder I got is KAT 33118, the gaskets are KAT 33119 (these are cork and not awesome). The cylinder is not opened at all...

QS4-6SS, got the last one from dpequipment.com Yes works as it should, looks identical to the one I took off.

Made 5 more and installed them today, verified clearance to inner gear of all and they were all about the same, right about 0.050". This is without any shims. The two loose wheel bearings took about 180 degrees to get to 15 ft lbs.

From an engineering perspective, many plastics would work well for this. Teflon(PTFE) is a go to for temp resistance and chemical resistance. Have to verify chemical resistance and max temp of whatever plastic used. Delrin may be a good option. I didn't want to do that much research as plastics...

Was a little concerned about the small m5 cap screw that was the only thing keeping the wheel nut from loosening, so I did a modification: https://www.steelsoldiers.com/threads/from-fire-truck-to-mtv.216741/post-2544472

Wasn't a big fan of the split collar that came with the ECO hubs, mine is the one with an M5 screw. Considering if that clamp failed, the entire wheel would detach I started looking at another solution. This got kicked into high gear when I checked for wheel bearing tightness and I had play in...

Got a perfectly working CTIS controller for $39 that way, not all can be winners though.

I've had good luck with ASA in "high" temp areas.

Sounds good I'll contact you if this next one is also bad. It's already shipped.

Do you know if it's a known good one?

Chasing down ABS issues still. My board had some signs of water inside...the newer replacement looked better on the outside but inside was a mess. So basically no progress.

Ordered a used ABS module off ebay. Looked a heck of a lot better than mine did...on the outside. I plugged it in but couldn't talk to it at all. Decided to pull it apart and see what I could find...well it's pretty obvious why it wasn't working: Then I decided to pull my original one apart...

Seems like getting the spade back after a pull could be very difficult depending what it drove into/how deep.

If feeling frisky, park brake diaphragm replacement:

This is the reason I support this forum. Awesome info, have been planning to do this. How did you determine the sizes for those who don't have a similar year?

Videos of the somewhat precarious box mounting

I think it's a great idea. So far I've been using them as spares (or to replace ones Snuffy removed- like abs.

Finished drilling most of the holes (middle 5 out of 20 on each side I don't have the clearance for due to huck bolts) and took it on it's first drive with the box mounted. Didn't notice much drivibg difference except I no longer have the harmonic bouncing going down the road. Hopefully that...