Welcome to the hunt! You're fortunate the son took an interest in it. Enjoy those moments.
I just checked the links and this page still seems to work. The guy that spent a ton of time on this page is a genius who's taller than most.
Here is the link to the parts list that several of us have been working on for the G749 series. We will continue to update it as new part numbers are discovered. Please let me know of any additional part numbers you might come across and I will add those to the list for everyone to use as...
www.steelsoldiers.com
BRAKES
I'm sure the local lads will chime in with brake pads and parts. We're a back-up, frozen storage field so if they don't find the gold we can usually thaw it out of the ground up here. NOS front knuckle seals can be found from India, then in Elvis's home town. Not all NOS seals remain usable so back up plans and parts may be needed. We broke the knuckle seal trying to stretch it over the ball so the split....is at the top.
You're likely running the smaller 1 1/4 wheel cylinders. Some aftermarket 'new' cylinders tended to leak soon after install. Acquiring and hoarding quality parts is a good plan. We've been lucky with the larger 1 3/8 wheel cylinders only having to replace one in 6 years. The barn out East is still full of cylinders apparently.
The air pak needs attention. There's a port on the back that likes a little lube every six months. We used air tool oil which has kept ours happy so far. We also drain the air tanks at the end of every day.
Our deep freeze has split a few brake lines on the trucks running Dot 5. The guess is the water separates, settles in a low spot, freezes and expands. We also found a grey colored soup in one of the trucks we flushed. No one asked the 60 year old rubber inside the existing system if it was ok with Dot 5.
We're running Dot 3 in year eight with the last five years in outdoor storage.
Real good to see another one on the road for a little video competition across the continent.
You're in for a ride.
Once you're up and running do a little 0-50 video for us and let's see how those 9.00 size tires pull the extra weight to 50mph.