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Old 05-17-2005, 03:05 PM   #1
89BLAZ
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Vibration In Lifted '89 K5

I WAS WONDERING IF ANYONE COULD HELP ME OUT? I HAVE A '89 K5 LIFTED WITH 8" SUSPENSION KIT. I AM RUNNING 35" TALL TIRES WITH ALL THE NECESSARY DROP BRACKETS(SWAY BAR, TRANSFER CASE). I HAVE A REAL BAD VIBRATION THAT FEELS LIKE IT IS COMING FROM THE TRANSMISSION-TRANSFER CASE AREA. THE DRIVESHAFTS HAVE BEEN BALANCED. THIS ONLY OCCURS UNDER LOAD AND HAS DONE SO SINCE I LIFTED IT. I HAVE HAD IT LOOKED AT AND THEY TOLD ME I NEEDED TO DROP MY CASE DOWN MORE. I HAD 1" SPACERS AND NOW I HAVE APPROX 1 1/2". IF I DROP IT ANY MORE IT LOOKS LIKE MY TRANNY WILL HIT THE FLOOR. PLEASE CAN ANYONE SHEAD SOME LIGHT ON THIS SUBJECT....I REALLY DON'T WANT TO GO TO A 6" KIT TO GET RID OF THIS PROBLEM.


THANKS,
SEAN
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Old 05-17-2005, 03:24 PM   #2
Mudder
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Sounds like you have a bad angle on your driveshaft. Or it could be a tire. Are you tires balanced? Are the front and rear yokes on the driveshaft in phase? I guess thats what ya call it???? Pinion nut loose? What kind of tires and how big? Oh how is the slip joint? Is it pretty much extended out?

Last edited by Mudder; 05-17-2005 at 03:25 PM.
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Old 05-17-2005, 04:12 PM   #3
89BLAZ
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The Tires Are Not Balanced...but Really Is Not A Tire Vibration...you Don't Feel It In The Steering Wheel, Just From The Floor Boards And Seat. Slip Yoke Is Fine. It Was Extended Out Too Far Then I Had The Shafts Lenghtened. The Other Stuff I'll Have To Check. So The Joints Have To Be Lined Up Together...i Would Say Mine Are Not. Thanks For The Help...i'll Check It Out.

Thanks,
Sean
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Old 05-17-2005, 04:36 PM   #4
freightdriver
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how much of that lift is blocks? i'm saying its a drive shaft vibration and you either need to get your rearend turned or a dual cv driveshaft to correct it
i've got 1.25in of tcase drop and a dual cv driveshaft 4in springs and 4.5 blocks i've ran it up to 95 with no vibrations. hope you get it fixed getting the rearend turned is roughly aound 250 and my dual cv shaft was 350..
oh and i'd go back to the 1in tcase drop all its doing is making your front driveshaft angle worse...
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Old 05-17-2005, 04:45 PM   #5
89BLAZ
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ALL OF THE REAR IS BLOCK (5.5) WITH A ADD A LEAF. I Tried Using Degree Shims But That Really Didn't Help. The T-case Drop Redused The Vibration...but Not Completely. Thanks Oh By The Way...nice Color On The Blazer...mine Is Orange Too. Pictures Are Too Large To Download...but It Is In Image Gallery On Home Page.

Thanks Again,
Sean

Last edited by 89BLAZ; 05-17-2005 at 04:45 PM.
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Old 05-17-2005, 09:51 PM   #6
kwmech
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You may have to get a slip yoke eliminator kit from www.jbconversions.com
Then you can put a cv rear shaft in.
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Old 05-22-2005, 09:19 AM   #7
special-K
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I suggest springs too,no blocks.I`d also suggest 6".That extra 2" is your bigger culprit.Unless you are planning bigger tires that require an 8"lift,you don`t need all that lift.If your not going to get into alot of twisty stuff,you can actually loose 4" and still run 35s.To each his own,but I don`t get too wild with mine and I love the way it feels on the road,stable.I have 33s(1" less axle clearance),10 rims,and no lift.I just had the spring shop level up the front(helps handling,also)and add a leaf.Like I said,to each his own.I lift trucks,too.I was going another approach with this Blazer.Probably not your cup o`tea.Just trying to add some perspective.
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