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post #1 of (permalink) Old 02-26-2002, 12:36 AM Thread Starter
 
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Vibration at low speed

after my spoa i have a slight vibration in 1st and 2nd was wondering if anyone else has had this after spoa 5.5 inch lift someone help please

1988 Zuk 5 1/2 SPOA 31x10.50 stock gears 1.3 life long project
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post #2 of (permalink) Old 02-26-2002, 06:40 AM
 
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Re: Vibration at low speed

Mine does the same thing, haven't figured it out yet though..
Few things people have told me to check..
pinion angle
Tcase mounts
ujoints

Are you running spacers?

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post #3 of (permalink) Old 02-26-2002, 07:21 AM
 
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Re: Vibration at low speed

Mine shakes like hell...Its the Pinion Angle for sure....A Toyota Drive shaft will fix this problem...The little Sammi U-Joints cant handle the angle...The Toy U Joints and Shaft are bigger...

94 SPOA 33" EFI Sammi (Mine)
91 Stocker Sammi (Wife's)
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post #4 of (permalink) Old 02-26-2002, 07:22 AM
 
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Re: Vibration at low speed

Shims'll fix it. RRO - steel, Spidertrax, aluminum.


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post #5 of (permalink) Old 02-26-2002, 08:33 AM
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Re: Vibration at low speed

If that vibe is under hard acceleration, it's due to spring wrap. The pinion can rotate easier now that the springs are under the axle, and the torque is wrapping the nose of the diff upward as it accelerates....
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post #6 of (permalink) Old 02-26-2002, 08:54 AM
 
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Re: Vibration at low speed

Shims?...You mean the spacers???...If so, they made mine vibrate worse by far.

94 SPOA 33" EFI Sammi (Mine)
91 Stocker Sammi (Wife's)
Fuel Injected is the only way to wheel.
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post #7 of (permalink) Old 02-26-2002, 11:28 AM
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Re: Vibration at low speed

Ok some food for thought (mmmmm, foooooodddd)
there may be slop in the slip joint (since the drive shaft may may have less spline in the upper shaft) sometimes fixed by spacers
or the u-joint angles upper and lower may be rather extreme (sometimes fixed by shimming (putting little pie/angled chunks of steel in the spring perch to spring pack area) I've got about 6* or so shimmed in the rear of mine 4.5" and no drive shaft spacers.) causing some vibes. Ya may have a bad u-joint, drive shaft could be out of balance, you may have put the drive shaft halves back together wrong (there **should** be a small indention on both sides of the shaft, put them together so they are matching).
Anyone else?

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post #8 of (permalink) Old 02-26-2002, 11:54 AM
 
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Re: Vibration at low speed

Couple of questions since I have the same problem.

What did you use to Shim the axle??..>
Did you shim the back to poit the nose down more, or the front to point the nose up more??...
How do you keep the spring packs from coming loose from the perches if they are shimmed?

94 SPOA 33" EFI Sammi (Mine)
91 Stocker Sammi (Wife's)
Fuel Injected is the only way to wheel.
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post #9 of (permalink) Old 02-26-2002, 12:02 PM
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Re: Vibration at low speed

I'm sorry, I kinna half assed my shimms. I cut 2" sections of a tire iron, welded them to the rear perch and then took some say 1/4" or so plate steel and welded that to the front of the perch and on the top of the tire iron sections. I figure I have about 5* or so ish.. The purpose was to raise the pinion..

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post #10 of (permalink) Old 02-26-2002, 01:59 PM
 
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Re: Vibration at low speed

You want the t-case angle and pinion angle as close to parallel as possible unless you go to a cv driveshaft and then you want to point the pinion directly at the t-case.


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