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Old 01-05-2017, 11:50 AM   #1
42Ford M-H
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Default 43 Marmon Herrington 4x4 top speed

Any info on a safe top speed for the 4x4 drive train? The war tag says a top speed of 40. I'm not sure where they get that number from. Gear ratio? I'm shooting for 55 mph once I change gear ratios etc... or maybe even stick in an overdrive. I'm assuming if i take it easy that 55 won't damage the 4x4 components but I don't know that for sure.

Thanks in advance for any info.
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Old 01-05-2017, 12:04 PM   #2
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Default Re: 43 Marmon Herrington 4x4 top speed

Most convoy speeds were low for WWII time frame. Although they were never what a person would refer to as fast, I think you could get a bit more out of them without hurting any of the drive train. If the vehicle was set up for snow plow or blower then the speed would be as fast as you can go without doing any damage to the accessories and 40 mph would be in that bracket.
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Old 01-05-2017, 12:43 PM   #3
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Default Re: 43 Marmon Herrington 4x4 top speed

I'm thinking your top road speed will be more a pure function of final drive ratio and tire outside diameter, rather than of the M-H components. When Chuck Mantiglia rebuilt my F-3 axles he installed his custom 4.11/1 gear sets (which I don't think will fit your axles). When I get the truck done I'll have 34" or 35" tires that will yield more road speed than I'll have guts to ask of it.

I don't have any 1943 truck data, but the below 1942 chart from the Ford Reference Manual ought to be close enough. M-H would have spec'd the lowest final drive ratio available I believe which would be the 6.67/1. If you find a couple sets of 5.14/1 gears and team them with 38" tall 8.25-20" tires you'll be set to go. Note that the chart's figures are for 2500 rpm operation. Stu

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Old 01-05-2017, 01:28 PM   #4
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Default Re: 43 Marmon Herrington 4x4 top speed

Truckdog you are the man, thanks again for sharing your wealth of knowledge. I've been keeping my eye open for some 5.14's. I'm leaning towards taking my axles to Chuck to have him go thru them, and possibly put in the gears. He's probably has 2 sets of gear.

You wouldnt happen to have any info on the gear reduction drive for the Sno go's would you? more specifically I'm looking for the ratio of the reduction. I'm looking at the possibility of flipping it around and using it as a overdrive. Which if i go that route I won't need the 5.14's. Physically I think I can get it to work, Still not sure about the internals of the unit. I need to tear it apart and look for thrust bearings etc...
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Old 01-05-2017, 01:36 PM   #5
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Default Re: 43 Marmon Herrington 4x4 top speed

I believe Chuck has said that he has NOS 5.14/1 sets. As for the SnoGo under-drive, I know nothing about that. But Chuck will know. Good luck with it. Stu
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Old 01-05-2017, 01:43 PM   #6
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Default Re: 43 Marmon Herrington 4x4 top speed

I had a 43 GMC 6x6 and it would cruise at 55 no problem all day, until you got to a hill. We have a few hills here in Conn. where she'd get down to 15-20 MPH, but would climb them. The trucks were never made for speed, and were designed for off road use on undeveloped roads. Their weight capacity was also cut in half. A 2-1/2 ton trucks load capacity was 2-1/2 tons of cargo off road, 5 tons over paved roads. A truck like yours was never considered for "Combat use", but for on base use.
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Old 01-05-2017, 03:19 PM   #7
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Default Re: 43 Marmon Herrington 4x4 top speed

I was reading somewhere that the 4x4 M/H conversion raises the load rating. I could be wrong. Can't see myself hauling many heavy loads, but it would be fun to get a load of gravel once in awhile. We have our fair share of mountains in NY.
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Old 01-05-2017, 04:16 PM   #8
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Default Re: 43 Marmon Herrington 4x4 top speed

Be sure to run dual straight pipes up the back of the cab so you can hear that flathead cackle under full load!
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Old 01-05-2017, 04:33 PM   #9
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Default Re: 43 Marmon Herrington 4x4 top speed

I don't know if the underdrive would be a Brown & Lipe or something MH came up with. There were a lot of "Brownie" type over/under drive set ups back then for all sorts of uses. MH certainly made a lot of their own axle assemblies.
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Old 01-06-2017, 09:40 AM   #10
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Default Re: 43 Marmon Herrington 4x4 top speed

Don't believe it is a Brown-Lipe. Can't recall the name, but it is uncommon.
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Old 01-06-2017, 10:56 PM   #11
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Default Re: 43 Marmon Herrington 4x4 top speed

Watson perhaps?....
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Old 01-06-2017, 11:12 PM   #12
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Default Re: 43 Marmon Herrington 4x4 top speed

pictures of a former military fire truck--notice the under/over drive
Attached Images
File Type: jpg P6050008.jpg (62.0 KB, 94 views)
File Type: jpg P6050011.jpg (51.2 KB, 110 views)
File Type: jpg P6050005.jpg (74.5 KB, 100 views)
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Old 01-07-2017, 09:01 AM   #13
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Default Re: 43 Marmon Herrington 4x4 top speed

Marmon Herrington made a lot of the fire trucks used during the war. I don't know if they were all wheel drive or not.
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Old 01-07-2017, 09:45 AM   #14
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Default Re: 43 Marmon Herrington 4x4 top speed

Some were awd some 6x4. Depending on the manufacturer some had a splitter like the above picture and some had a splitter by the tandem.
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Old 01-07-2017, 12:10 PM   #15
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Default Re: 43 Marmon Herrington 4x4 top speed

Here's a picture from 'vintage photos thread' on FTE
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File Type: jpg MH fire trucks.jpg (55.6 KB, 75 views)
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Old 01-09-2017, 12:29 PM   #16
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Default Re: 43 Marmon Herrington 4x4 top speed



Here is a pic of the drive train. Dirty and grimy atm, once i get it cleaned off I'll post a pic of the name and patent date. Patent date is April 1918
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Old 01-09-2017, 12:34 PM   #17
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Default Re: 43 Marmon Herrington 4x4 top speed

I forgot to mention I opened the under drive to check out the gear ratio. LOL 5:1

The older gentlemen i bought it from told me a quick story when i was loading the truck. Apparently his neighbor was bragging he could tow that backwards with his new chevy 4x4 I'm guessing late 80's early 90's. So they chained them up, he put everything in in low gear including the under drive, let out the clutch... Got out of the truck and was talking to the guy thru his drivers window as he was getting towed backwards.. LOL
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Old 01-09-2017, 01:39 PM   #18
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Default Re: 43 Marmon Herrington 4x4 top speed

the wwII gmc 6x6 had overdriven 5th gear in the main trans. not the same in the marmon i would guess.
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Old 01-09-2017, 03:21 PM   #19
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Default Re: 43 Marmon Herrington 4x4 top speed

With my experience driving WWII 4 X 4 vehicles I have found that at speeds much above 45 mph these vehicles can become a bit of a handful to keep in a straight line. Once you have driven them for a few hours you certainly know how tiring (and Noisey) it can be, JMHO.
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Old 01-09-2017, 05:53 PM   #20
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