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got the cornfed on, man she looks great. 3in the front 2.5 in the rear. but nowwwwwwwwwwww, i have a vibration between 15 and 25 mph. what could it be ? was not there before now it is. it seems like its in the drive line somewhere. has anyone had this problem and what did you do to fix it? :confused: :confused: :confused: :confused:
 

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upwithit said:
got the cornfed on, man she looks great. 3in the front 2.5 in the rear. but nowwwwwwwwwwww, i have a vibration between 15 and 25 mph. what could it be ? was not there before now it is. it seems like its in the drive line somewhere. has anyone had this problem and what did you do to fix it? :confused: :confused: :confused: :confused:
You need to get a front end alignment for starters and then go from there.
Brian
 

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did you do the diff drop? Did you get the alignment? Are you tires balanced? Since your lifted, find a place that will do a lifetime alignment.
 

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depending on how you lifted the rear, block or aal or shackle, you may need to shim it to adjust the pinion angle.
 

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KStacoma said:
depending on how you lifted the rear, block or aal or shackle, you may need to shim it to adjust the pinion angle.
Could you please explain the pinion angle adjustment?
Thanks,

FS.
 

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upwithit said:
got the cornfed on, man she looks great. 3in the front 2.5 in the rear. but nowwwwwwwwwwww, i have a vibration between 15 and 25 mph. what could it be ? was not there before now it is. it seems like its in the drive line somewhere. has anyone had this problem and what did you do to fix it? :confused: :confused: :confused: :confused:
Over 2.5 inches of lift with ADD front axles can cause vibration. Check out Downey Off Road.com for catalog. Read the warning. It's actually true!!! You might need to go to a diff drop, or a 2.5 lift. Some trucks are worse than others. Yours, unfortunately, is worse. No sure reason why. It is cv angles. :xdevil:
 

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the all exaulted "diff drop" is a waste of time and $25; don't bother. it does NOTHING for the CV angles.

you problem is most likely in the rear. The pinion angle needs to be 0 degrees.

start here: http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml
then go to the "technical Referances" at the bottom of the page for more info.
 

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rojodiablo said:
It is cv angles.
Why misinform him by saying its the CV's when you have absolutely no idea whether that's what it is or not? The problem very well could be with his pinion angle.
 

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Pathtaco said:
Could you please explain the pinion angle adjustment?
Thanks,

FS.
The front part of the diff where the driveshaft connects is where the pinion gear is housed. It "points" toward the tranny along the driveshaft. If the pinion is directly in line with the driveshaft, then the pinion angle is 0°. Since there is a double cardan (two ujoints together) joint in the driveshaft, the pinion angle should be at or near zero for smooth operation. If it's off by a few degrees, then vibration becomes a problem.

If the angle is off, there are shims of varying degrees that can be placed between the axle and the spring pack to bring it back or close to spec.
 

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Discussion Starter #11
i have the manual hubs. i was informed on here that the diff drop was not an issue with my truck. i know its in the rear drive line somewhere. i can feel it. i thought i read somewhere on here that some other people had the same problem. she wasent shaking before the lift. its not the tires its a drive line problem. i am just looking for a fix. the vibration has got to stop. no lift is that important. i will check into the shim issue.
 

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upwithit said:
i have the manual hubs. i was informed on here that the diff drop was not an issue with my truck. i know its in the rear drive line somewhere. i can feel it. i thought i read somewhere on here that some other people had the same problem. she wasent shaking before the lift. its not the tires its a drive line problem. i am just looking for a fix. the vibration has got to stop. no lift is that important. i will check into the shim issue.

This should help ;) http://www.4crawler.com/4x4/ForSale/Shims.shtml
 

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Discussion Starter #13
i know with as many 2.5 aal that have been installed someone has had this same problem. its got to be a standard fix. i just want to know what they did if anything to correct it.
 

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There is very little possibility that the vibration is coming from the front when the truck has manual hubs. It is most likely a rear driveshaft angle vibration.

Upwithit, is your truck a reg cab, double cab or extra cab? Many double cabs need to have the carrier bearing on the driveshaft lowered after being lifted, regular cabs don't have a carrier bearing to support the driveshaft because their driveshafts are shorter and don't need it.

The carrier bearing is a support that is mounted about halfway down the driveshaft to help support its own weight and it mounts to the frame crossmember IIRC. Because the carrier bearing doesn't move when you lift, it causes an even more extremem angle on the driveshaft than if there were no carrier bearing. Make some spacers to move it down so that there is no angle in the middle of the driveshaft and you will likely have solved the vibration.
 

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22RToy said:
The front part of the diff where the driveshaft connects is where the pinion gear is housed. It "points" toward the tranny along the driveshaft. If the pinion is directly in line with the driveshaft, then the pinion angle is 0°. Since there is a double cardan (two ujoints together) joint in the driveshaft, the pinion angle should be at or near zero for smooth operation. If it's off by a few degrees, then vibration becomes a problem.

If the angle is off, there are shims of varying degrees that can be placed between the axle and the spring pack to bring it back or close to spec.
I am experiancing a vib in my 05. I Could swear it is coming from the right front tire area of the truck. It happens sometimes and not others. I have checked for lose nut bolts anything but have come up with nothing. The vib seems less when it is warmer out. But this could be a figment of my imagination
 

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upwithit said:
i know with as many 2.5 aal that have been installed someone has had this same problem. its got to be a standard fix. i just want to know what they did if anything to correct it.
My truck did the same thing, so I did some research and came to the conclusion that I needed to space the carrier bearing down for the rear driveshaft. After I did that, the vibration went away. I had a vibration at the same speed that you do.
 

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Bnorm said:
My truck did the same thing, so I did some research and came to the conclusion that I needed to space the carrier bearing down for the rear driveshaft. After I did that, the vibration went away. I had a vibration at the same speed that you do.
What was the size of the spacer that you used?
 

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Carrier bearing spacers are just normal washers. Buy some washers at Home Depot and start adding until you find the correct spacing. Not every truck will require the same amount.
When you buy washers try to use Stainless Steel washers to avoid corrosion problems later.

Tim
 

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Get your front end alignment done and then shim your carrier bearing and that should get rid of the problem
 

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I had the same problem on my 04 D-Cab. I did shim the carrier bracket down with washers as others have said, and it did seem to help.
 
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