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Old 02-26-2013, 08:19 PM   #1 (permalink)
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Question NEED HELP ASAP with bad vibration

I have had my 87' stock Sami for a few years now. Recently it started vibrating like crazy but only when its in gear and over 40mph. I found that i had a broken transfer case mount so i replaced it and its STILL vibrating!!! What do yall think is wrong??? ANY help with this would be greatly appreciated
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Old 02-27-2013, 11:32 AM   #2 (permalink)
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First check the obvious.
Loose lug nuts
Tie rod ends and pitman arm

Then get the tires balanced. Sometimes wear will cause a wobble between 40 and 50mph and just getting them balanced can do wonders.
The tire shop can check wheels for any issues at that point.
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Old 02-27-2013, 11:50 AM   #3 (permalink)
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It only vibrates when in gear, if I engage the clutch or put it in neutral the vibrations stop... That leads me to think its in the drivetrain not the wheels tires etc... Perhaps a u joint went bad and the driveshaft is vibrating and that's what broke the transfer case mount in the first place????
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Old 02-27-2013, 11:54 AM   #4 (permalink)
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Sorry, forgot U-joints on my initial list.
But the shaking from the unbalanced tires is more violent under load for some reason.
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Old 02-27-2013, 12:12 PM   #5 (permalink)
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How can I tell if a u joint is or has gone bad?
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Old 02-27-2013, 12:18 PM   #6 (permalink)
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Apply the parking brake.
Put everything in neutral.
Slide under the vehicle and grab both sides of each u-joint, attempting to twist violently...
If there is any movement in the joint, something that feels loose, then it should be replaced.
Here is a link to an article showing how to replace them if you need to.
U-Joint Rebuild
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Old 02-27-2013, 12:21 PM   #7 (permalink)
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Great thank you! I will do that and let you know! Is there anything else you can think of that could be causing the crazy vibration??
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Old 02-27-2013, 12:28 PM   #8 (permalink)
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Last thing to check (because I have never worn any out before) would be the kingpins.
Jack up the axle from the center just a bit, keeping the tires touching the ground.
Grab the top of the front tire and push-n-pull.
THere should be no movement.
If you hear a clunking noise you will need to pull the wheel and check the upper and lower kingpins for failure.
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Old 02-28-2013, 04:04 PM   #9 (permalink)
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The problem was bad u joints on drive shaft in between the transmission and the transfer case.
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Old 02-28-2013, 04:11 PM   #10 (permalink)
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Good catch!

And Welcome!
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