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help with pinion yoke

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dyeager535, Mar 13, 2001.

  1. dyeager535

    dyeager535 1 ton status Premium Member

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    Already posted once, didn't get but one reply, about used pinion yokes. I need a new one for the rear 10 bolt diff in my '86. No one knows of a supplier that doesn't charge $100? I'm gonna call GM and see what they get, maybe gmpartsdirect.com will be substantially cheaper...I can afford the 4100, but seems an awful lot for an extremely common piece. I would consider used, but in this instance, I want to make absolutely certain (as best I can anyway) that the yoke is not the culprit.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  2. ftn96

    ftn96 1/2 ton status

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    Culprit for what may I ask?

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  3. RESTORE89

    RESTORE89 1/2 ton status

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    have you tried randy ring and pinion? i just bought new gears, 4.11's for an 89 gm 10 bolt, and the gear set was only 149.00, so i would think the yoke would be less. just an idea. also get an off road mag, and look in the back for the suppliers. avoid 4 wheel parts wholesalers like the plague, i ordered from them myself, and if was not a pleasant experience. also several other posts with tales of woe from them.
    chris
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Pinion seal leaked when I bought the axles. Took the driveshaft off, the yoke nut was loose. Tightened it up, leak gone. 1 month later, leaking again. Sure enough, pinion nut loose. Ok, maybe I didn't torque it good enough. One week later, leaking again. Pull off yoke, notice that the seal (has two lips, not just one) has worn one very deep groove where one end of the seal sits, and none at the other end. Also slightly corroded (I assume water in the diff) between where the seal rides. I polished the area up with 800 sandpaper and wd-40, and replaced the seal in the housing. Yoke looked perfect, besides some pitting where it shouldn't affect sealing. Lube seal. Put yoke back in. Silicone washer that goes under the pinion nut, to eliminate any chance of leaking from there. Loc-tite pinion nut. Torque down considerably. Drive two days, leaking again.

    Don't get me started on the diff cover bolts that also loosened up on their own 3 times even with lockwashers...now they too are leaking again. Last time I straightened the cover and put new gasketin, and I was so mad and sure the diff cover wouldn't leak, that I loc-tited the diff cover bolts..MAYBE I can get them out..

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Yeah, they are great, but $100. gmpartsdirect.com has them for $66 including shipping, IF I can figure out if I have a "square end" or "tapered end" yoke...I guess GM's computer shows that both styles were used in '86, but I have no clue which is which. All I have ever seen look like mine, with straps, not u-bolts.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  6. ftn96

    ftn96 1/2 ton status

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    It doesn't sound to me like you need a new yoke. Sounds like your pinion nut keeps backing off. And those are either lock nuts that are stamped, or they are the rubber/nylon insert type. Either way it sounds like the locking is gone. Especially after removing and replacing it several times.
    Try getting a new lock nut instead. Lock-tite only does so much. Especially in a place that carries a load such as the pinion.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  7. ftn96

    ftn96 1/2 ton status

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    Let me ask you one more question. When you are driving and lets say it has starated leaking again and you haven't tightened it up yet. Then you are braking farely hard at a stop light. When you release the brake does the rear end sound like its making a clunking sounds? Sorta feels like the rear is binding up and then settles?

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Nope, no noise whatsoever in that situation. I can usually hear the gears start to whine a bit more as the fluid gets low though. I think anyways, with no sound deadening, and the manual trans/gear drive transfer case, there is gear whine all over the place.

    This time I don't think the nut has backed off. I forgot that I have loc-tited it twice...the first time I loc tited it was before I replaced the seal. when I went to loosen it up to replace the seal, it was still very much tight. Since I used Loc-tite this time, i don't think it has backed off. Everytime the pinion yoke backed up, I know it was eating the seal up, thats why I was hoping the new seal would solve it. But seeing that bad groove, just like on a harmonic balancer, I figured I'd be lucky if it quit leaking..but at least it did for a day or two.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  9. HarryH3

    HarryH3 1 ton status Author

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    Are you certain that the vent isn't somehow blocked? I'd check that since the thing seems to be leaking almost everywhere. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    My friend told me the exact same thing..I was wet, cold and pissed off last time I was down there, but I really should crawl under it again and unbolt the stupid vent hose and try blowing through it. Thanks for the reminder.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  11. bablazer73

    bablazer73 1/2 ton status

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    I have a yoke, if you need one. There is also supposed to be sealant on splines that the yoke goes onto. on the pinion gear. Napa sells sleeve kits for these like for the balancers. I had to do a rear in a 63 chevy once, the yoke had a groove and would not stop leaking. Napa was the only place that could get me one.

    your right. I don't understand the jeep thing!
     
  12. HarryH3

    HarryH3 1 ton status Author

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    Dorian, also check the fitting on the axle tube that the hose attaches to. The hose could be clear, but that fitting could have some crud in it. When I lived in Texas the damn mud hornets would plug any small hole on your truck that they could find!

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

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    Back to the top...

    I did check the vent. there is no problem there...I could pressurize the differential and I could hear the air escape when I stopped inhaling. (hmm, wonder how my lungs liked that???)

    Checked the diff cover bolts that have lock washers, and that I loc-tited last time. Guess what, they are loose again. Probably was grease in the threads, but still, backed out again after 3 days?? I've got a new diff cover, but I find it really hard to believe that the bent diff cover would cause those things to back out that quick. Oh well, may try some star lack washers, or bolts with the "waves" in the integral washer to really dig into the new cover. Got a yoke coming too...

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  14. HarryH3

    HarryH3 1 ton status Author

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    Maybe you should try dousing the axle with Holy Water. Sounds like it's possessed! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     

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