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best 20 bucks i ever spent...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by yeild2me, Feb 11, 2001.

  1. yeild2me

    yeild2me 1/2 ton status

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    man, i have had this vibration/grinding sound coming from the rear end when taking off from a stop since i bought my jimmy in 95...i have changed u joints several times and came to the conclusion that i just wasnt going away...then the other day i was messing around under neath it and noticed a lot of slop when i yanked the tailshaft of the t-case back and forth...upon further inspection, i saw that the tranny mount was totally wasted...i went down to autozone and for 20 bucks bought a new one. it went on in about 30 minutes, and now is as smooth on takeoff as ever before...it also got rid of a lot of vibration at hi-way speeds...definitely the best 20 bucks ever spent!!!!!

    AIRBORNE!!
     
  2. BurbinOR

    BurbinOR 3/4 ton status

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    My same exact fix cost $45.............urethane mounts from ORD. You're right, makes one heck of a difference over those spongy old ones............yuk.

    <font color=orange>'79 - 406 TPI -<font color=orange> K5#5 - <font color=blue>See it at---&gt;<A target="_blank" HREF=http://www.blazzinor.coloradok5.com>http://www.blazzinor.coloradok5.com</A>
     
  3. 90K5

    90K5 1/2 ton status

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    How hard is it to change? Mine looks pretty bad...

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  4. yeild2me

    yeild2me 1/2 ton status

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    it was a cinch!! i put a small floor jack in the center of my spare tire and positioned it on the tail housing of the t-case.. i removed the 2 bolts from the mount to the cross member...i loosened the cross member bolts until just a few threads was holding it up...i removed the 2 bolts from the mount to the transmission and pulled it out.. the whole time the t-case was supported by the jack..depending on how bad yours is, you may have to remove the mount to crossmember bolts before you jack it up...while i was there and had the crossmember bolts loose, i lowered the t-case with the spacers....i swear it took about half an hour....

    AIRBORNE!!
     
  5. 90K5

    90K5 1/2 ton status

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    I don't know if this is common, but under hard acceleration, I get a lot of vibration at higher RPMs. Did this cure it by any chance? It seems like it would.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  6. yeild2me

    yeild2me 1/2 ton status

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    the way i figure it, upon hard acceleration, the torque from the d-shaft rotates the pinion upward (as we all know), now if the mount is bad, the t-case and everything goes up becuase of the force pushing against the tailshaft...what this does is increase the u-joint angles..i really cant beleive the difference this made!! one way i thought that this could be proven would be to lie on the ground NEXT to your truck and have a buddy put it on gear, hold the brake and give it gas in short little bursts...this way you could see the t-case moving up and down....bought the new one before i could have my wife jump in the cab and help.. i think this is also the reason i cant keep the output seal from leaking because the constant wear on the bushing from the slip yoke riding on it....

    AIRBORNE!!
     

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