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Thread: Driveshafts

  1. #31
    4 Star General coachgeo's Avatar
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    Quote Originally Posted by tobyS View Post
    Having just built the driveshaft for my deuce, I was told anything more than 2 degree difference of the TC and the differential is too much. Does the rear differential face down to match the engine/tranny/TC angle?

    I'm glad the M35A3 is parallel to the frame...I used a 2.8 degree block to bring it to about 1.4 degree (under the magic 2*).
    engine tranny is at a 2% up angle.... assume the stock axle is set to match but didn't measure prior to removal.. only matched it when installing high pinion. Issue appeared to us that normal drop of the rear axle suspension moves the two planes of the faces (@tranny yoke and @rear axle yoke) more out of synch with one another compared to if the engine tranny was in typical downslope fashion. Least that was our hypothosis
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  3. #32
    4 Star General NDT's Avatar
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    Axle pinion is parallel to frame. So there is the allowed 2 degrees.

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    Sergeant Major wandering neurons's Avatar
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    Two place I know of for drive shaft repair or rebuild in the Maryland area: In Lorton, VA, just outside DC off I-95 is Driveline Services, aka Drive Line Specialists (https://www.drivelinespecialist.com). I've had multiple custom driveshafts done there. It's an old shop that does lots of service. Yes, it's a ways away from you, but they can ship back to you.
    Also, something I investigated but never used, is FleetPride. Find a local site, you drop off the drive shafts, they take them to their central repair/refurb area and when done send them back. They can also get lots of parts for LMTV and other trucks.
    As an aside: I have a M1081 with about 11000 miles. Had my drive shafts rebuilt about three months ago by a local shop in Colorado Springs, CO, even though I had the D on my tags. Both front and rear were badly worn in the splines. New shafts were much smoother, and the 1000 miles last month between Colorado Springs, CO and Reno, NV went so smoothly!
    1994 M1081 LVAD "Goliath"
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    M35A1 (long time ago, far, far away)

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    I do not see any dash plates with the D on my 97 M1088? Did they hide it? I did checked today and my front shaft did not have a weight and no play in the slip joint. Shaft to front tandem had a weight and no play in slip joint. Rear shaft no weight but some play in slip joint and hard to really to measure with it installed but not that bad I thought. Was wishing it was as tight as the others but o well. Thanks for the good info in the thread. Don't know if you remember but when I got the truck front drive shaft was out of phase and thanks to another thread got that straight. Guess I got lucky as there is no more growling or vibrations when I come off full throttle to half throttle. Even at full speed ahead no vibrations lucky again. Before I was thinking it was the front chunk as I know I had just set up all the hubs correct or dang close to it.
    Last edited by Floridianson; 06-16-2019 at 12:47.
    James

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    Super Moderator gringeltaube's Avatar
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    Quote Originally Posted by Floridianson View Post
    ...... Don't know if you remember but when I got the truck front drive shaft was out of phase and thanks to another thread got that straight.....
    What thread was that and/or what exactly was done to fix it? Was it just one spline off, or did it have to be cut and re-weld?

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    Colonel DREDnot's Avatar
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    Quote Originally Posted by Floridianson View Post
    I do not see any dash plates with the D on my 97 M1088? Did they hide it?
    This thread made me check mine...

    20190503_134048.jpg

    I could see a faint "D" stamped in.

    The driveline angles on this thing are dictated by funky military requirements and not customer NVH complaints.
    Other reading I've done mentioned that the research into the vibration would best be fixed with RZEPPA style joints but they also lacked strength and were nixed in favor of the bigger single cardan fix("D" stamped)

    The main point is that the driveshaft life was traded for off-road prowess (and simplicity)
    1998 M1078A0
    1993 M998
    1986 M1009(sold)
    1992 M101CDN(sold)
    "Non Vi Sed, Arte"

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    4 Star General Floridianson's Avatar
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    No believe someone flat towed the truck and removed the front drive shaft. Some how guess they also pulled the slip joint apart and don't know why they would. Then when someone that did not care or did not know what they were doing when it came time to put the drive shaft back in the machine. They just put it out of phase on assembly by maybe six splines so she was way off. I guessed on the rotation to make the correction of the yoke and took it for a full speed drive and no vibration.
    James

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    Colonel DREDnot's Avatar
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    Can these slip yokes be assembled out of phase? My HMMWV has an aligning spline that soldier proofs the shaft assembly. All the u-joints on the HMMWV front shaft are out of phase with each other on purpose.
    1998 M1078A0
    1993 M998
    1986 M1009(sold)
    1992 M101CDN(sold)
    "Non Vi Sed, Arte"

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    3 Star General Awesomeness's Avatar
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    Quote Originally Posted by Floridianson View Post
    I do not see any dash plates with the D on my 97 M1088? Did they hide it?
    You shouldn't have to worry too much, they [supposedly] ALL got the upgrade, even if you have trouble seeing the "D" stamp. Then again it is the Army, so I'm sure there are a few trucks out there, but your chances of having one would be small still.

    I'm not sure about this part, but I think that one way to tell is that the original driveshafts had yokes that the u-joints bolted to with u-bolts. So if yours are types with screw down caps, it should be good. I'm not 100% sure, but I think I remember that being one of the recommended fixes, to remove the u-bolt style u-joints.

    I know it's a lot of money, but I still recommend you have your driveshafts checked and rebalanced. While it seems that only a small percentage of people have big issues, when they do it destroys the engine, or more. When my engine got wrecked, I couldn't feel an abnormal vibration from in the cab, even though I'd had the truck a year or so and put 1000-2000 miles on it. So it's not entirely obvious, and I'm usually quick to notice new sounds, smells, etc. that the truck is making.
    Quote Originally Posted by DREDnot View Post
    Other reading I've done mentioned that the research into the vibration would best be fixed with RZEPPA style joints but they also lacked strength and were nixed in favor of the bigger single cardan fix("D" stamped)
    The Rzeppa style joints are stronger. The engineering report said they failed the water intrusion test, but that the engineers suspected that could be overcome, and that the Rzeppa joints were the recommended solution.

    I have yet to see a document detailing why, but I assume the Army just used the bigger shafts and u-joints because it was a cheaper, faster solution (little or no re-engineering involved, all off-the-shelf parts). You have to figure that they were desperate for a fast solution, because they had put a 35MPH limit on their entire new fleet of LMTVs. That had to be very frustrating, and embarrassing... good thing the USSR was gone and wasn't watching anymore.

    Quote Originally Posted by DREDnot View Post
    Can these slip yokes be assembled out of phase? My HMMWV has an aligning spline that soldier proofs the shaft assembly. All the u-joints on the HMMWV front shaft are out of phase with each other on purpose.
    Yep.

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  17. #40
    4 Star General coachgeo's Avatar
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    Quote Originally Posted by Floridianson View Post
    I do not see any dash plates with the D on my 97 M1088? ..
    your's is a 6x6..... those never had a driveshaft issue probably due the different rear axle. As far as I know the 6x6 never got the "D"... Could well be they off the shelf had the heavier duty components that became the D standard anyway (driveshaft and Tranny bell housing) just cause they were built to be 5 ton trucks from the get go and the others only 2.5ton??

    either way if the 6x6 driveshaft was not initially changed along with the "D" of the 4x4/AWD LMTV's..... over time they probably got changed to upgraded driveshafts just cause motorpool didn't want cary both type driveshafts. (pretty sure long rear driveshaft is same length for Mtv and LMtv. )
    Last edited by coachgeo; 06-16-2019 at 21:11.
    One does not get troubles in life... just character building opportunities. Build on with a smile

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    Sold: 1962 Dieselized Unimog 404, 1984 Int. 24foot Flatbed, 97 Jeep TJ heavily Modified, Datsun Roadster(s) & 510(s)

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