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Bad vibrations

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BLzr4x4ngkid, May 1, 2000.

  1. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    On Friday night I backed out of my driveway and started down the street towards the highway. When my '87 Jimmy hit about 30mph it started to vibrate like it would when the u-joints get bad. I just had them replaced a month ago and the driveshaft in the rear isn't loose. I know the front driveshaft has to have the spline rebuilt, but would that cause a vibration too?? I have Warn manual lock-outs and it's really starting to piss me off. I just got my lift and haven't even put it on and this is starting again. Help....PLEASE!!

    Alex
    Wichita, KS
    What me get stuck? NEVER!!(Famous last words)
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Location:
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    You might want to check your tranny mounts and bracket..... I was having the same thing happen to me and it ended up being a loose bracket rattilng against the frame. It REALLY felt like a u-joint, too. Thanks to Eagle for the advice on that one!!!
     
  3. BlueKnight

    BlueKnight 1/2 ton status

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    especially that rubber mount bushing under the transmission. Also make sure your hubs are unlocked so you are not spinning your front driveline.

    <font color=purple>79' K-5 396cid 600hp, TH350, NP203</font color=purple>
    http://79blueknight.homepage.com
     
  4. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    Where are the mounts located for the tranny?? My dad could point them out, but since he's not here right now maybe one of you could help. Thanks for giving me another possibility for the vibrations.

    Alex
    Wichita, KS
    What me get stuck? NEVER!!(Famous last words)
     
  5. Eagle86K5

    Eagle86K5 1/2 ton status

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    You are most welcome Canmore...anytime Brother...
    Shame we don't live closer so we could have a club house...secret handshake...high signs....

    <font color=green>[​IMG]Eagle86K5[​IMG]
     
  6. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    It is my u-joints. I'm not too happy, because they are only a month old to the day. This isn't starting out to be a good week, but it's all good. I'm going back to the place tomorrow and get it fixed. It's not like I'll be on foot. This just means that I'll have to bust out the 'Vette'. Oh well, life sucks!! HAHAHA

    Alex
    Wichita, KS
    What me get stuck? NEVER!!(Famous last words)
     
  7. BillR

    BillR 1/2 ton status

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    Location:
    Flagstaff, AZ
    U-joints only lasting a month? Is this normal for K5s?
    Do you guys carry these on the trail with you?
    Thanks in advance

    Blazin' in Flagstaff
     
  8. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Location:
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    Only lasting a month on a stock truck means there is something wrong with the u-joints they used, or how they were installed.
    With a 4" lift and stock rear driveshaft, I replaced mine after about 20,000 miles, but it was just for preventative maintenance and there was nothing noticably wrong with the ones I replaced..........it's just so much easier to replace them in the shop on a hoist then in a mud hole.
     
  9. Blazer79

    Blazer79 1/2 ton status

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    Mines are 7 years old and no problems. No lift, though.

    <font color=black>//////
    What the heck!...Drive it like gas is $0.50/gal!!!
    </font color=black>[​IMG]
     

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