doubleclutchinweasel

Yes, the "M" indicated Maxidyne.

That's slick, Larry.

30 minutes ago, Brocky said:

DCW: I can drive anything as long as I  and/or the Truck DO NOT get paid..

DAs Geoff says above check you home state laws.. If you can find the PR / desk bound officer for your "Diesel Cops" they will take the time to look up the law a LOT BETTER than the local DMV.. We even has one come to our chapter meeting, lay out the basics and answered a lot of questions.

Here in NC, we have class A, B, & C licenses...in both commercial and "civilian" forms.  Sounds similar in SC.

Yes, even a commercial vehicle less than 26,001# can be operated without a CDL.  That's because so many "commercial" vehicles are actually pickup trucks, cars, and such.  So, there is an exemption for those lighter weights.

26,001# and over requires appropriate class A or B CDL IF used to generate revenue.  If not used to used to generate revenue, there are non-commercial class A and B licenses available (at least in some states).

And, a CDL can be used in place of a "civilian" license.

12 hours ago, Joey Mack said:

exactly !!  Brocky..

So, did you essentially wind up with a non-commercial class A, or is it still commercial and just can't be used commercially?

"If you've used a "No Fishing" sign as a rod holder..."

They loved their inertia starters!  Nothing like that sound, is there?

3 hours ago, Geoff Weeks said:

Rockwell made their own "top losding double reduction rears, are you sure they were not those models?

According to the folks in the plant, these were made for Mack.  Not sure if that was a 1-time thing, an ongoing order, or what.

I know that "Mack" rears HAVE been made by other people than Mack.  Not sure what years, though.  A few years ago, we were in a Meritor (formerly Rockwell) plant, and they had "Mack" rears, which Meritor had made there, stacked to the ceiling.  Contract work, I suppose.  Again, not sure if that happened that long ago.

Mine came with QR valves factory.  It did not come with relay valves.

Parking Brake Valve with Anti-Compounding Function (one way to do it, anyhow).

PP-2.pdf

Pretty sure this was it...

I have schematics for the later (R) brake plumbing.  But, I saw a link to this site that had schematics from people who had already converted their Bs to spring brakes.  So, you should have plenty of information at your disposal.  The air systems really are not all that complicated once you understand what is being done.  You shouldn't have any issues getting it plumbed in and working the way you want.  Here is a link to one of them.  A Google search will show you others.

One think I do encourage in a spring brake setup is the use of an anti-compounding valve to keep from applying the service brake and parking brake at the same time.  The way mine was done from the factory was really simple and did not require a separate valve.  Mack used a specific push-pull valve for the parking brake which had the exhaust side plumbed in by a small line to the service brakes.  This way, if you applied service brakes, that pressure went into the release side of the parking brake and negated some of the spring force.  Voila!  Anti-compounding!  Then, when the parking brakes were released, the exhaust port was closed and the service brakes worked normally.

LTK, are you going to upgrade the truck to modern spring brakes?  If so, you may not need to worry about some of the "old" parts.  You can set it up like a more modern piece, and use current valves.

I tool the DD3 chambers and inversion valve off my '70, and used piggyback chambers with spring-loaded parking and emergency brakes.  What I ended up with was far simpler than what I started out with.

Seen lots of B-models with a parking brake valve added to the dash.

22 minutes ago, Licensed to kill said:

Don't know what an "inversion valve" is, what do they do?. It is not a tractor protection valve, I have that off the same truck. 

Inversion valve was a predecessor to spring brakes. If the air pressure dropped, the inversion valve sent air from an emergency reservoir to the parking brake chamber of a DD3 type chamber. 
I don’t think that’s what it is though. 

They could have been different back then, couldn’t they?

I wondered about an inversion valve, but I've never seen one that looked like that!

No numbers?  Could that be some kind of pressure reducing valve?

If you will PM me an email address, I will try to send you some catalogs that might be useful to you...IF the file size isn't too large.

23 hours ago, JoeH said:

There should be a sideways torque arm from the right frame rail to the rear differential. The eyes on these wear out, but if the truck is acting this way from new I'd wonder if someone forgot to install it...

Reread, you stated it's missing the transverse torque arm.  There's your culprit. I assume all your other trucks have it. For shits, go to your dealer parts dept, and run the trucks VIN and ask for that torque arm. If it comes up as a part on the truck then I'd tell the dealer to file a warranty claim and install it on Macks dime, citing that it never had it from new so they must have forgotten it at the factory.

Boy!  That would be a pisser!  Wouldn't it?!!

All the old stuff I ever saw had 2 6V batteries in series on each side, making for a 12V system.  Many times those got replaced by a single 12V battery on each side.  SOME had the relay to bridge the 2 12V sets in series to run a 24V starter.  Some just had 12V starters.

As far as I know, all the stuff that vintage was originally positive ground.

I never was around any gas powered stuff.  All ours were diesels.

Agree on the chasers. Sometimes taps and dies do cut more than expected. Just need to clean them up. 
I have used both though. 

Finally got to see the last 2 videos.  Love it!  Love the sound, too!

Only thing that would make it better is if it lived in my driveway.