Page 2 of 3 FirstFirst 1 2 3 LastLast
Results 11 to 20 of 24

Thread: 5 ton vs 2.5 frame differences?

  1. #11
    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
    Join Date
    Jun 2011
    Location
    Memphis, TN
    Posts
    7,539
    Thanks
    108
    Thanked 7,486 Times in 3,306 Posts

    Default

    Quote Originally Posted by WRoll View Post
    I’m going with the 66” tires. I’m going to use a 12 valve 5.9 as the powerplant. That way it fits in the engine bay. I had considered a Big Cam, but then I would have to cut part of the cab and it would be sitting beside me. Any source for 5.9 Cummins engine mounts or all they all custom fabricated?
    There are some SAE 2 bellhousings available for the 5.9s. This would be the same type of frame mount that the M939A2 trucks have in the engine bay which allows for 505 cubic inches to be between the mounts and the radiator location.

    Big difference in a 12 valve and a Big Cam. 360 cubic inches vs 855 with no middle man consideration? Seems odd. Also factor in that a 12 or 24valve will cost you more than mostly the whole truck as to where you can buy some big cams for $500 if you are lucky and rebuild it for under $2k.

    You will also need to factor in your transfer case setup as well. Something that can hold up to a 12valve will not hold up to a Big Cam. So choosing a big truck frame for parts and having to factor in the building for the wheel chock parts could pose some issues on mounts

    To me it would be easier to take a 939 series truck and retrofit your cab around what is already there and built.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

  2. The Following User Says Thank You to simp5782 For This Useful Post:

    Csm Davis (09-26-2019)

  3. #12
    Private
    Join Date
    Jul 2019
    Location
    Shawneetown, IL
    Posts
    7
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default

    The SAE 2 bellhousing for the 5.9 was one important reason why I decided to go with it. I considered the Big Cam, as I am familiar with them from having them in several semis and tractors here on my farm. After some thought, I didn't want to cut into the cab and have the motor laying beside me, as I want to keep it stock on the inside and not look like a race cockpit. That left me to decide between a 5.9 or a DT360. I chose the 5.9 due to availability and the aftermarket that caters to it. I bought one off of a friend, with relatively low mileage.

    I am basing this build off of the "Klone Kong" truck that Jeff Dane made to resemble his original King Kong truck. He did a step-by-step build with it, and he used the original Caterpillar 3116 engine mated to the auto transmission. He had to cut the cab to fit it, and I didn't want to do that.

    I have a 1978 F150 body that will be used for this project.

    I appreciate all of your replies.

  4. #13
    4 Star General
    Join Date
    Dec 2009
    Location
    Fargo ND
    Posts
    1,885
    Thanks
    304
    Thanked 828 Times in 419 Posts

    Default

    I dont know what mods to the 5.9 your looking at or the end result HP but one thing to definitely keep in mind is the very large weight difference between the two, I would not be surprised if the 5 ton frame assembly is twice as heavy as the Deuce. Another thing is you will never make enough HP to damage even a Deuce frame. If you put this together with a 5 ton frame your going to need some serious HP (like 700 HP) because of the weight or your going to be driving a real pooch as in SLOW and the needed gearing is not going to give you the wheel speed your going to be looking for, especially running the size tires you looking at, no matter what frame you going to need to bump up the HP on the 5.9 a pretty big jump, its the price you pay when starting with a truck frame as opposed to a pickup!
    Good luck!

  5. #14
    4 Star General
    Join Date
    May 2013
    Location
    .
    Posts
    4,138
    Thanks
    2,612
    Thanked 1,879 Times in 1,145 Posts

    Default

    If you plan on doing any welding on the frame, use a deuce frame. It's 8x3x1/4". The 5 tons are high tensile strength and should not be welded...also harder to drill. The 5 ton is a lot stronger, however.
    M35A3 4x4 "Money Pit"
    M929A2
    (14) 5 tons bought and sold

  6. #15
    Private
    Join Date
    Jul 2019
    Location
    Shawneetown, IL
    Posts
    7
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default

    Karl, I am building the 5.9 to be in the 500 horsepower range. Iíve seen video of the King Kong truck driving around under the power of the 3116, and he did fine. I donít plan on any serious racing with this truck, just driving around my neighborhood and maybe going to a car show every now and then. Thanks for clarifying how much more a 5 ton frame weighs, I didnít know they would be THAT much heavier.

    Toby, I will be doing a decent amount of welding for body mounts and drilling for the placement of shocks. Thanks for the info.

  7. #16
    4 Star General Csm Davis's Avatar
    Join Date
    Sep 2009
    Location
    Hattiesburg, Mississippi
    Posts
    3,988
    Thanks
    1,964
    Thanked 1,962 Times in 940 Posts

    Default

    Why not start with a 931A2? The 8.3L Cummins is the big brother to the 5.9L and almost all of the upgrades are the same. Good P-pump and bigger turbo, add an intercooler and rock out.

    Sent from my SM-G930V using Tapatalk
    Jeff Davis
    SGM G-4 NCOIC Mississippi State Guard
    Hattiesburg, Mississippi
    (601)264-3453

    M931A2 2012 Camp Shelby rebuild
    M928A2
    M927A1 USMC ISO BED
    M927
    M923A2 WAR WAGON GUN TRUCK
    M816/936 Half Breed
    M1028/31 Combat Vet
    M1028 Phoenix
    M1010
    2-M1008's
    4-M1009's
    XM971 TRAILER Mobile HQ
    M129A4 Desert Storm Memorial
    M295a1
    MEP-002A
    2-MEP-003A
    MEP-006
    M101A2/3
    M1101
    M116A2
    M116A3/tool trailer

  8. The Following User Says Thank You to Csm Davis For This Useful Post:

    Jbulach (08-08-2019)

  9. #17
    4 Star General 71DeuceAK's Avatar
    Join Date
    Jun 2015
    Location
    Fairbanks, Alaska
    MVPA
    37704
    Posts
    1,262
    Thanks
    46
    Thanked 543 Times in 285 Posts

    Default

    So are you doing dual steers on a 5 ton frame? Just a bobbed and dual-steer-axle M923A1? Many will hate me but I myself have to admit I've had many ideas for a "mega truck" project. I always figured I'd just use the axles from a 923 under a pickup though.
    '86 M928A1

    Founder of Friends of the M939-Series Trucks

    MVPA # 37704

    "I'm in this weird predicament where I know where every grease zerk on an M939 series truck is, but can't even fix a Briggs & Stratton lawnmower. Is that any indicator?"

  10. #18
    Administrator patracy's Avatar
    Join Date
    Jul 2006
    Location
    Buchanan, GA
    MVPA
    37424E
    Posts
    13,406
    Thanks
    1,229
    Thanked 12,238 Times in 3,337 Posts

    Default

    Quote Originally Posted by simp5782 View Post
    To me it would be easier to take a 939 series truck and retrofit your cab around what is already there and built.
    This all around. Been there, done that.
    1992 M1038
    1969 M35A2 wo/w, hoist in bed, heater, Ooga horn, Recentered HEMTTs and 395's, "Candy Smasher"
    1968 M543A2 Wrecker - You know, for heavy lifting...
    1984 M931 - SEMTT project
    198? M270 trailer TBD...
    1985 M1008 - SMOKEY 8" lift, 37" humvee 24 bolt wheels/tires, turbocharged.
    And a few M105 and M101 and other trailers

  11. #19
    Private
    Join Date
    Jul 2019
    Location
    Shawneetown, IL
    Posts
    7
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default

    Actually, I didnít even consider the 8.3 Cummins, because I assumed that it wouldnít fit in a 73-79 Ford engine bay. According to specs, it is 4.4 inches longer than a 5.9. Iíll measure my pickupís engine bay tomorrow to see if there is enough room.

    At this point, I was just going to have one steer axle. I didnít want to dive into rear steer until I see how the truck handled and had the project otherwise completed.

  12. #20
    4 Star General 71DeuceAK's Avatar
    Join Date
    Jun 2015
    Location
    Fairbanks, Alaska
    MVPA
    37704
    Posts
    1,262
    Thanks
    46
    Thanked 543 Times in 285 Posts

    Default

    WRoll, PM me if you like. I'm curious to discuss this more but don't want to hijack a thread LOL.
    '86 M928A1

    Founder of Friends of the M939-Series Trucks

    MVPA # 37704

    "I'm in this weird predicament where I know where every grease zerk on an M939 series truck is, but can't even fix a Briggs & Stratton lawnmower. Is that any indicator?"

Page 2 of 3 FirstFirst 1 2 3 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •