Four wheel drive UPS MH's

[yarnall]

I know there has been some discussion of these trucks in the past. Tom Smith gave me this magazine several years ago when I got my MH. Hopefully this article was not posted before. Sorry they are out of order. Read 1 first. Enjoy. Mike

Mack MH 4x4(1).pdf

Mack MH 4x4(2).pdf

Mack MH 4x4(3).pdf

Mack MH 4x4(4).pdf

[39 Baby Mack]

That was my magazine!!!!!

was wondering where it got to???

Ron

[yarnall]

Your name is not Jim Williams. You can have it back if you want it.

[farmer52]

Mike,

Interesting article. Thanks for posting. I wonder if Rifleman knows anything about the MH 4x4?

Ron,

I think you and Tommy need to talk.

[Green Dash]

Will the real Jim Williams please stand up.

That's a neat article and if it has been posted before I'm sure I'm not the only one that missed it, so thanks for the possible re-post.

I see they used a 10 speed overdrive but blocked out 1st through 4th on the high side. I guess they just wanted overdrive in top gear to offset the required 4.63 axle. Being a Maxidyne they would've otherwise gone with a 5 speed. Could that be the same 6 speed tranny that was discussed on here recently or was this one unique to this application?

[39 Baby Mack]

Your name is not Jim Williams. You can have it back if you want it.

Mike I wouldn't mind having a copy of it sometime,

But to be truthfully honest with you, you knew where to find it which is something I sure as hell wouldn't.

It's in safe keeping, glad you have it.

Ron

[MHfred]

Mike,

Interesting article. Thanks for posting. I wonder if Rifleman knows anything about the MH 4x4?

Ron,

I think you and Tommy need to talk.

I sent Rifleman an email lettting him know about this thread and to see if he had any input.

[j_martell]

good read....Thanks for posting

[DailyDiesel]

After spending some time at UPS this past holiday season I don't believe a truck like this would ever be ordered again.

[TeamsterGrrrl]

Back in those days UPS engineered and designed the truck they wanted, then shopped for a manufacturer to build it.

[rsb502]

That is interesting blocking out the high split in 1st thru 4th and leaving the OD split in 5th. Those transmissions have some pretty close gear steps in the first three anyway so running light like UPS does I doubt youd need to split em all anyway. I guess those are all dead and gone and recycled into hyundais by now, sure would be a great find though.

[Superdog]

I know where 1 is.

[kscarbel2]

It's always great to recall Mack Trucks' superb "Dynamax" wet clutch.

[yarnall]

I know where 1 is.

Where are the pictures?

[Superdog]

Where are the pictures?

I'll get some,but the location is top secret.

[57 bcr]

...........as in "I could tell you,but then I'd have to kill you" type of location,Mike? Al

[vision386]

Don't think I ever saw a 4X4 MH in person,i did see a 4X4 Freightliner C.O.E (CF) pulling a set of pups out in Colorado many years ago..................................Mark

[Joe Ditchkus]

Kscarbel. I had a 1979 R686 tri-axle dump with the Dynamax Clutch.I still have some of the parts behind shed. Pretty smooth operation no pedal effort. Joe D.

[kscarbel2]

Kscarbel. I had a 1979 R686 tri-axle dump with the Dynamax Clutch.I still have some of the parts behind shed. Pretty smooth operation no pedal effort. Joe D.

UPS never minded paying for a product that saved them money, And Mack Truck's patented Dynamax wet clutch (designated CL-72 and CL-721) did.

The Dynamax clutch was an option available to all customers but it actually came to be because UPS demanded it, initially in the F-model from 1970 and later in the MH (in those days, when UPS spoke, Mack listened).

It was produced for Mack Trucks by Rockford Clutch Corp., and they lasted nearly forever.

Clutch engagement took some getting used to but I wish more customers had tried it. The long life more than offset the added purchase cost. Mack basically worked with Rockford to very successfully adapt their wet clutch technology for off-highway construction machinery to the heavy truck application.

The new Voith VIAB is a combination wet clutch and retarder. The clutch will, like Mack's Dynamax, last almost forever.

VIAB allows for wear-free starting AND braking. Watch your bottom line grow, and your accountant smile.

http://www.voith.com/en/products-services/power-transmission/turbo-retarder-clutch-viab-12877.html

[Brocky]

Mark

In the early 70's CF had some of those Freightliner 4X4's running between Buffalo and Boston pulling twin 28 ft pups on the NY Thruway and Mass Pike back when the NYT regulations said that doubles had to have 2 driving axles.. UPS and everybody else was pulling 2 40 or 45 footers with twin screw tractors.

[vision386]

Brocky,do you remember that weird set-up CF had here on the east coast? if I remember correctly it was a long wheelbase single axle tractor with a pup attached to the frame,pulling a pup behind it more like a TRUCK and trailer,but not really! It had something to do with the length laws and doubles were not yet allowed this far east. I seen a few of them on the Jersey Turnpike when I was younger..................................Mark

[57 bcr]

Mark,

I remember that being in OVERDRIVE back in the day. I think Mike Parkhurst call it CF's "Frankentruck" or something like that! LOL! Al

[vision386]

That's exactly where I remember reading about it Al! something about CF "skirting" the rules because they were a major player in the trucking business back then?................................Mark

[vision386]

I found a few pictures and explanation of what I was talking about,but it's "you know where" and God-forbid I don't want to piss the Hanks off and start that shit-storm again ! They are calling it a "Pennsylvania Double" if anyone wants to venture over there and check it out!...........................Mark

[57 bcr]

Started out as kind of a long wheelbase single axle Freightshaker daycab with a fifth wheel that slid all the way forward until the lead wagon damned near touched the back of the cab.Can't remember how they actually "fastened" the now straight trucks body(trailer) to the frame,though? Maybe Velcro? It was just being introduced about that time! LOL! Anyway it ended up with a spread tandem on the now "truck". I know I have that issue here somewhere?? HMMMMMMMM????? Al