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  1. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    You could transplant the whole setup from a 915A1. With the HT754 it has. Just move your transfer case back 18inches. You can use two transfer to front tandem driveshaft from a m931 truck to put in as jackshaft and tandem shaft You will have to raise the cab and remount everything like I did...
  2. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    As long as you have a good air dryer. In which case I have two of them. Good clean air and normal operation it is fine. Member ponway uses his CAT 7155 in his Western Star truck and goes all over the country. He is in north central Indiana. I went with the CAT towards the small cam to see...
  3. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    I like using a tag trailer. I do go offroad but I don't have to use 6x6 that much. I deliver some heavy equipment offroad to remote locations but i haven't needed to use 6x6 especially with the gearing I have in the truck. It's a hobby. It is for commercial use but I don't go out all the time...
  4. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    I have ordered the bearings. No rush for me though. I don't use 6x6 at all and the transfer case only gives me 2mph more at 2150rpms it is only a .98 high ratio My truck was only down about 8hrs to drop the transfer case and install the longer driveshaft from the transmission to the front tandem
  5. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    gears are fine. It locked up while driving at 60 with an empty trailer. I know it locked up cause it peeled the companion flange end cap back like a banana when it broke off wasnt just a thrown joint. I believe a bearing just got to hot and locked up
  6. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    Bearings just go out. I had an issue when i first got it in which the Input bearing temp would get pretty hot. Sometimes 250 to 270 degrees towing around an empty trailer. Oshkosh assured me that a HET towing an Abrams would hit 300 or more degrees and it was meant for it. I think the front...
  7. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    welp shes busted apart. Looks pretty simple. The rear bearing retainer there has a adjustment for play. She had a noise when you would let off the throttle after 40mph. nothing below that. Was driving along and I guess it locked up hard enough to throw the driveline. I have some noise in the...
  8. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    Well I took her out and stretched her legs for a 2,800 mile journey with the new transfer case. Overall the power to the ground is well noticed. Overall speed with an empty trailer is around 62mph at 2100rpms and a little over 9mpg. Loaded with a 925 on the trailer mileage was around 6.5mpg...
  9. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    Completed. Total cost including transfer case, oil, steel,bolts, 2 U joints, two 4x4x12s, and reamer bits $350. About 10 man hours total into it of solid work. Used 2 tractor drivershafts that go from the transfer case to the front tandem. Replaced the u joints with some moog. The other one I...
  10. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    . Sent from my SM-G965U using Tapatalk
  11. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    It is for now. The mount bushings are 1.5" thick and aren't installed yet The rear shaft angle out of the transfer case will be slightly to the passengers side going to the diff. The front axle output on the transfer case is direct in line with the rear axle output so you can see the line angle...
  12. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    In. Took a good bit to get everything welded up today. About 2 dozen 7018 and 7024 rods. The bolts and steel will break before the welds do. I think I am going to unbolt the passengers side bracket and move it forward to center on the transfer case bracket. In the event of going back to a 5 ton...
  13. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    Fitment and mount type pics. 1/2" plate. Bolting to the transfer case I am only going to use 2 of the bolt holes . It should be fine with 5/8" bolts and the transfer case doesn't twist that much under torque. 1/2" x 8" x 4" plate on the transfer case mount. 14-3/8" from front to rear of the...
  14. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    That is a 3126 off a Genset that belongs to another member.
  15. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    There is a winch in the bed. A 45k off a 916. Sent from my SM-G965U using Tapatalk
  16. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    My truck scales out at 28780 with both tanks full. Sent from my SM-G965U using Tapatalk
  17. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    Alright folks. it is time. No. not time for the GA rally, but time for the swap. Tomorrow morning all the fun starts. I should have the bed slid back and old case out in about an hour or so and then I am going to start the fab work. From what I have noticed so far for my mounting is this. I...
  18. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    It will blow in high and low range. In 6x6 and normal operation. There is no pattern. Uses a lever to shirt high to low. The front drive engagement is air operated. Sent from my SM-G935P using Tapatalk
  19. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    The allison reverse is not super low at 10:1 . This case comes behind 550/600hp 1500ft lbs. Any torque from an 8.3 or nhc250 thru that 600series allison would be like a tickle. I run a 14.77:1 reverse 1 thru a stock 5ton case. In high range it has no issues even backing up 75000lbs. This...
  20. simp5782

    M923 Transfer Case upgrade to Oshkosh 55000

    M977 pics Sent from my SM-G935P using Tapatalk
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