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Thread: 1956 M135 GMC I6 Conversion to Diesel?

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    Private hungryhungarianz's Avatar
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    Default 1956 M135 GMC I6 Conversion to Diesel?

    Greetings To Everyone,

    I am excited to be apart of Steelsoldiers as I have recently acquired a 1956 M135 GMC Inline 6 6x6. I was told by the guy it can run multifuels. But looking closer at this engine as i dont know much but know a little. Im preety sure this is a gas engine? If i am wrong please correct me. And is it possible to have multifuel gas engine? And if not.............As i have been looking for a long time for a Biofuel 6x6 and rather then purchasing a M35 or something else now. I was wondering is there any conversions out there or does anyone know anyone that has dropped a Cummins Diesel or some other diesel engine into these machines to make them run on diesel? I'm sure there would be lots of work required to make it happen but any info would muchly be appreciated.

    Thank you

    duece.jpg duece1.jpgduece2.jpg

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    4 Star General NDT's Avatar
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    Nope, you have the good old 302 gas engine. It wants gas. Numerous threads on this site about engine swaps. Nobody is really happy with what they did.

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    4 Star General m1010plowboy's Avatar
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    My jitterbugs are rumbling. Is there a number stamped on the passenger side of the frame behind the passenger front wheel? About 16 inches long with 3/4 inch numbers?

    The wheels are odd and don't look like the correct offset for a M135. Obviously they could have put different wheels on it but the belly asks if the frame reads 1207XXXXX or 1211XXXXX.

    Only an expert with decades of experience would question the M135 designation you were given so let's play expert. Data plates and previous owners may be mistaken .....but the frame stamp doesn't lie.

    Welcome to Steel Soldiers and Early Deuce euphoria.

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    Private hungryhungarianz's Avatar
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    Thank you NDT! I was hoping for a better answer but i guess im stuck with a 302. I will continue to search......

    Thank you! m1010plowboy i took a pic of the stamp card IMG_2659.jpg . Is that what you are referring to?

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    4 Star General m1010plowboy's Avatar
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    Quote Originally Posted by hungryhungarianz View Post
    Thank you NDT! I was hoping for a better answer but i guess im stuck with a 302. I will continue to search......

    Thank you! m1010plowboy i took a pic of the stamp card IMG_2659.jpg . Is that what you are referring to?
    That dataplate looks like it's been rusted to the dash for a long time. There is a 2nd number stamped on the passenger side of the frame behind the front passenger side wheel and it should read 113505615.
    It's hard to see unless the frame is clean.

    It'd be nice to get the engine running to try out the transmission. If you do a swap and have a running drive-train to pull out, I know of a few trucks that want them. A running M135 is an amazing ride.

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    Clean her up and fire her up! --Take pictures and post them or it didn't happen. I like the round nose jimmy myself over the M35, but I admit multifuel is a nice feature to have. I guess I'd take either as a gift.
    BDGR

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    The round nosed Jimmys are very dependable and as you are in Canada you'll most likely find a better parts supply for them up there than for the M35 series. I may be biased, but I prefer the Jimmys. The 302 really perks up when you feed her 91 octane ethanol free gasoline. As for the hydramatic most of them are trouble free, but there are numerous resources available to you in order to fix anything that might come up. That goes for any issues you might run into, when in doubt, just ask.

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    Fix her up and post more pics.
    1952 M135 w/w #9412, Reg. #41115623 {not running - working on it}
    MEP-017A
    KA7APL [GENERAL CLASS] since 1978

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    Welcome to Steel Soldiers! I agree with everyone else. Start her up and see what you've got. I prefer the M135 with gas engine over the M35 mulitfuel.


    Quote Originally Posted by m1010plowboy View Post
    The wheels are odd and don't look like the correct offset for a M135. Obviously they could have put different wheels on it but the belly asks if the frame reads 1207XXXXX or 1211XXXXX.
    I'm not sure if the Canadian Military used ORD 7 SNL G749, but my copy states that when the M135 wheel supply was exhausted, to use the M211 or M35 wheels. One of my trucks that came directly from the Army in the 1970's is in that configuration. The original owner that got it as surplus from the Army did not change the wheels. He brought it home and let it sit until I bought it about 40 years later.

    0820151800.jpg

    Here's the two different wheels side by side.

    100_2810.jpg
    Last edited by USMC 00-08; 10-24-2018 at 18:15.
    02-1952 M135 W/O #5314 - Reg. #4G3868 (winch added at some point in its life)
    01-1952 M135 W/O #4984 - Reg. #41143???
    12-1951 M135 W/O #3194 - Reg. #41122836 945th Maint Co, 945th Antiaircraft Artillery Bn., Milford Delaware
    11-1951 M135 W/O #556 - Reg. #41121215 5th Army, 816th Quartermaster, Ft. Leonard Wood

    Video of #4984 https://www.youtube.com/watch?v=1FUElX_64i4
    Video of #5314 https://www.youtube.com/watch?v=xYMiR2DT7Fo

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    Private hungryhungarianz's Avatar
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    Greetings and Thank you again for all the Advice.

    m1010plowboy

    I looked for the second numbers but couldnt find. I will wait until it is home this weekend hopefully. I cant wait to fire her up and try it out in the yard. My wife will not be so happy but when she drives it she will love it. And i am looking forward as you say it is amazing ride.

    Bulldogger

    Soon as i tow her home this weekend hopefully my plan is to clean her up for sure as she needs a bath badly. I ordered a Panel with all the guages for her as she doesnt have one. And then my plan is to fire her up. The engine looks like its still very good shape. The oil does'nt smell bad from dipstick and their is still coolant in the radiator. I have no idea how long it sat for in this town but im sure it was a long time. As they told me it was a vehicle being passed down to another shop owner over the years. Soon as i drove passed by her i was in love and needed to have her. I find the shop owner and he gave me a good price for her and the rest is history now.

    Merle

    Will post pics for sure of the build as soon i get started this weeknd

    Carboarius

    You are very right. I don't mind the round nose jimmy and i kinda like it already as they mentioned it looks like a Jeep on steroids. My plan is to extend the cab and make it four door with a very unique wood finish camper/ hunters sleeper on the back. I found a guy in Alberta who has a bunch of them and maybe able to purchase parts from him in the future. Thank you for your feedback on the 91 octane i will try that for sure. As for the hydramatic transmission....i was doing some reading yesterday aboutt them on the net but have very little understanding yet about them. Is there anything special about them?

    USMC 00-08

    Thank you! And i will check out about the tires and take a closer pic of the size. I dont mind adding more beefier tires better for hunting.

    In my quest for answers yesterday i stumbled accross some very little information but somewhat useful maybe to everyone. It is off a site called Roscommonequipmentcenter. I think they are located in the US and they even have a quote on how much they charge to change over the engine. But the most useful part about it was i found out what type of engine you can put into a M-135. Here is the quote from there site.

    "2-1/2 TON 6x6 The REO 2-1/2 Ton repowering package consists primarily of a Detroit Diesel 4-53N engine. This 4-cylinder rated at 140 HP at 2,800 RPM, replaces the REO engine. The 4-53N engine mates with the existing transmission. The package includes all parts necessary to change fuel, exhaust, cooling, and electrical systems (to 12-volt). There is no significant weight change. The NAPCO repowering package costs about $11,300 plus shipping and 70 hours of labor for installation. The cost from General Motors of a Detroit Diesel 4-53N engine alone would be about $8,500. Other packages are available to overhaul axles, transmission, transfer case, brakes, and suspension. A package also exists for the GMC 2-1/2 Ton, which includes a Funk Power Shift for the transmission."

    They also have some info for the M-35 I think and here it is...


    "5-TON 6x6 A Detroit Diesel V-6 engine model 6V-53N is the basis of the 5-Ton repowering package. Again, the package includes exhaust, 12-volt electric, cooling, and other necessary modification parts. Also, an automatic 5-speed transmission is necessary and included. NAPCO estimates a cost of $23,000 to $24,000 plus shipping and 100 hours of labor for the 5-Ton package. The Detroit Diesel engine alone would cost over $12,000 from General Motors. Because of the new engine configuration, this package modifies some of the 5-Ton dimensions, but as with the 2-1/2 Ton, there is no significant change in weight. The purchase of a new 5-Ton 6x6 cab and chassis by state forestry agencies has been discussed between the USDA Forest Service and the Pentagon. New purchase cost would be about $70,000."

    http://www.roscommonequipmentcenter.com/nn2.pdf

    Now for some of you may have info or know about these engines but i know very little about the Detroit Diesel 4-53N engine. But from what i see i kinda like, but it will be years from now unless i find one in a oldtimers yard here on the west pacific coast as they were used in boats i assume. Does anyone know that this will work? And another question what is a Funk Power Shift for the transmission? Thats what they state in there info for the M135. So i assume with a Detroit Diesel 453N engine you need a Funk Power Shift Transmission? lol no idea what that is but hopefully someone can explain.

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