Vibration/Grinding Noise after installing 6" superlift - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 06-01-2007, 05:56 AM Thread Starter
 
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Vibration/Grinding Noise after installing 6" superlift

Thanks for everyone's input on which lift to go with....

Just had a 6" superlift installed on my 04 F-250 and have a question about some noises it's making.

Makes a vibrating noise in 1st and 2nd (mostly at the top of the gear shift).....has a vibrating/grinding noise when going above 70 mph, and when letting off the accelorator between 65-70 mph.

I should mention that I had the driveline shimed to eliminate drive vibration per manufacturers recommendations.

Thanks for any advice or firsthand simialr experiences.
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post #2 of 6 (permalink) Old 06-01-2007, 02:49 PM
 
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You shimmed the axle or carrier bearing? How much exactly?



How was the rear lifted? how much total block?
post #3 of 6 (permalink) Old 06-01-2007, 03:20 PM Thread Starter
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Thanks for the reply,

I had the carrier bearing shimmed.....

The rear was lifted with 4" blocks, and added a leaf. Any suggestions?

Thanks again.

cs
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post #4 of 6 (permalink) Old 06-01-2007, 06:26 PM
 
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4" replacement blocks or ontop of the factory block?



if replacement - use 1" carrier bearing shim

if added to factory - use 1.5"


The description sounds like an axle wrap issue, but im not thinking it is due to the add a leaf, they really stiffen the pack up
post #5 of 6 (permalink) Old 06-01-2007, 10:35 PM Thread Starter
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4" replacement blocks or ontop of the factory block? I have a 2 inch factory block on top w/ integrated bumpstop, then a new 4 inch block, then the factory block which sits on the axle. You can see them in the attached pictures

In regards to the carrier bearing shim.....I measured (2) gold shims which combined are 1/2" thick. You can see the shims in the pics as well.

Do you mind quickly explaining "axle wrap"...do you think any of this is of major concern, I would like to drive it and feel comfortable that im not messin something up.

I really appreciate your feedback and help man.

Thanks
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post #6 of 6 (permalink) Old 06-02-2007, 04:49 PM
 
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Yeah, thats not nearly enough shim in the carrier bearing. That kit appears to be meant to run with the factory block in for a raked stance (like it is now), or without the factory block for a lower rearend look.

The way you have it now, you need about 1.5" of shim, rather than your 1/2".


Axle wrap is the natural motion of the pinion teeth trying to climb the ring gear, so when you takeoff in drive, the pinion turns upwards and can in some extreme cases cause bind. The more block you have, the more leverage around the springs you have; it makes it very easy to bend the springs up in an "s" shape. The is the cause for whee hop as well.
I dont think your main problem is axle wrap though due to the add a leaf, they tend to stiffen up the pack to prevent the "s" bending decently well; i think the pinion is actually seeing too much of the opposite angle, therefore its noticeable when you let off the gas. The takeoff vibes generally indicate wrap, but i would fix the driveline angles and then get to work on the axle wrap....traction bars wont fix squat if the angles are bad to begin with.
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