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Subject: rear end

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chris eby    Posted 12-23-2018 at 12:34:51 [URL] [DELETE]        [Reply] [Email]  
  • rear end
  • well, a little ambition hit me yesterday.so I decided to start to swap out my cracked rear housing on my 39. found a rear with trumpets on it. but the fender bolts are really rusted in the holes. so, I decided to use the trumpets on my tractor. this brings me to the question, is there anything special to know about, to set up the ring gear and pinion?I have heard to use two trumpet gaskets on each side to compensate for the thinner trumpet castings on the older tractors? apparently the original gaskets for the thinner trumpets were thicker? anything else I need to know? never set up a ford rear. seems like a no brainer,but one never knows.chris

    Jim.UT    Posted 12-24-2018 at 09:23:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: rear end
  • I'm not there and you are, but it seems like less work to get the rusty fender bolts out. Lots of heat, PB Blaster and maybe a nut splitter. I've taken enough rusty tractors apart to know that they all will come out with enough persuasion. Acetylene torch is essential sometimes.

    Jock(OR)    Posted 12-24-2018 at 04:05:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: rear end
  • The trumpet-to-center housing gaskets affect the bearing adjustment of the two tapered roller bearings on each side of the spider gear housing. That adjustment can also be changed by using shims behind either the cups or the cones of the bearings.

    You can change the ring-to-pinion tooth engagment pattern by moving shims from one side to the other to move the ring gear closer or further from the pinion. You could do the same thing by changing the gasket thickness between sides.

    The pinion can be moved in and out with shims, too.

    Since the parts catalog does not show shims in any of these positions, I assume that Ford felt that manufacturing tolerances were small enough to keep things in proper adjustment without using shims. After all these years and worn parts, it may be necessary to shim things to get them to fit properly. A mechanic with experience setting up rear ends can check the tooth engagement.

    Farmer Dan    Posted 12-23-2018 at 16:08:43 [URL] [DELETE]        [Reply] [Email]  
  • Re: rear end
  • When I changed the center housing on my 40 it was pretty straight forward. I took the wheels off but did not pull the axles out of the trumpets. I used an 8N center housing more better towing options. Funny thing is of all the tractor shows she's been to no one has ever noticed.

    DUEY    Posted 12-23-2018 at 15:09:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: rear end
  • While I have not done this either, there are two basic adjustments:

    1. Fitment between the ring gear and pinion gear

    2. Fitment of the rear wheel bearings where the axles touch in the middle.

    One adjustment does not affect the other. Trumpet gaskets only affect #2.
    Not sure if that helps your question or not.

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