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Found the GMC piston seals. I am sending my old ones in for ID and will be shipped 2 new ones along with the manufactures part #. They are roughly $6 each. The long story: I called Dale at Brake Systems Inc this morning because he is regarded as an expert on these units. Dale is familiar with...

I like the mechanical brake switch idea even better. It would take a few more beers to install but would be well worth it IMO. Anytime you can delete a switch or other electronic device from your brake system by all means do so. I removed the temporary parking brake solenoid on mine as well...

Many members here have been quite good to me. What goes around comes around. :beer:

Don't use another original switch which may blow again at any time, on a single circuit brake system this is bad. This is an easy fix. The master cylinder has 2 threaded plugs on the outlet end for misc fittings. This switch should thread right on, you may need a thread adapter but that is a $3...

Part number CC and GG is what you take from the 5 ton kit and put it in place of the GMC parts. Excellent picture of the book, Dave.

Long term is always the best solution, I agree. And it all depends on how determined an individual is to keep his/her truck in operating condition. -The 5 ton piston swap into the GMC air pack is very viable as long term solution since it enables you to use 100% of the 5 ton kits which are...

There are two of them on the small piston and they are more "cups" than O rings. The 5 ton kit does contain these two cups but they are for the 5 ton piston which is a different size. Fortunately, the 5 ton piston assembly swaps into the GMC pack quite easily. I've got another place to call...

I was quoted $5000. Will be finding another rubber company. One with less overhead.

In the meantime i've emailed a custom rubber injection moulding company for a setup quote on the GMC air pack piston seals. I would imagine it would be around $500. So anything is possible, it's just a matter of $$ most of the time. When I get a quote I will post it in a new thread and see how...

Your best bet is to find an air pack core to use as parts. Option 2 is finding a seal company or brake parts house that carries the two little piston seals off the GMC air pack that the 5 ton kit does not contain. Let me call around tomorrow! The piston seals or "cups" look just like the old...

I am willing to bet Memphis Equipment may have it in stock. I need to check myself as I am going to need to get mine back together sooner than later.

Yep, if that truck sat for any more than 5 years the air pack likely needs a rebuild. Some get lucky, most don't. My AIR PAK seals and O rings were all disintegrated and melted from sitting in old brake fluid for so long. The good news is you can get a new one from Alfa Heaven for $200 or...

Take your time on the parts, Dave. Lord knows I have plenty of other things to do at the moment. Tonight I cleaned the Np231 case and parts and ordered up a few parts, should have it back together and on the 700r4 in a few day's. It should only weigh around 50 to 60lbs so I think I can lift it...

That is very motivational, seeing your mom and dad in there! I look forward to meeting them both someday!

Funny what a little liquor will do. rofl

A 5lb mallet and a couple decent licks and my top dog bone off the rear axle is off. It was a lot easier than I thought. The other one is still good. Just going to replace this one since it is bent a little. The truck used to be a bare chassis/cab and when the Army gutted it they left the old...

:popcorn:

Well the guy at Memphis said the rods are not interchangeable between the M35's and GMC's. He said the GMC's do also have rubber in them like the M35's, but they are more secure as the bearings are pressed or "peened" in and are less failure prone then the M35's which have heard of just letting...

The top rod at the rearmost axle is bent and the pressed in bearing shell is bulged out. The 2nd bad torque rod is the one on the drivers side middle tandem which also has the bearing shell bulged out. I think the GMC torque rods are designed differently from the M35's which are rubber mounted...

Out of a 25' roll I managed to crank out 4 axle hard lines with near perfect flares. The rest was "trial and error" and ended up in the scrap bin. :lol: Can't complain! Today I re-torqued a great number of bolts and found most to be 20lbs under spec! Also found 2 bad torque rods and adjusted...