[upwithit]

dudes, i know we have beat this to death, but its gotta stop. this vibration at 01-15 mph has got to go. i have shimmed down the carrier bearing and eliminated most of it. but the rest of the vibration has got to go. i removed my rear drive shaft and drove around just to make sure the vibration was coming from the rear drive line and it was.as soon as i put the shaft back in and took off in two high the vibration reared it ugly head. so i crawl under the beast yesterday to start my venture. i want to eliminate the carrier bearing shims, and install some custom made leafspring shims so i can get my pinion angle back to zero. i was going to start my quest for measuring for some custom made shims and while looking at my springs, i noticed that under my overload spring (on top of perch) there were a set of shims that looked like factory shims. one on each side. the thick part was pointing towards the tranny and the thin side towards the rear. they looked like a factory item. this truck was bone stock before i put this lift on.( cornfed 3 in front and 2.5 aal rear 96 ext cab v6 auto.) anyone else have these items? has anyone installed leafspring shims before on an extended cab? if you have please let me know what degree you used and what direction they were pointing. (skinny side. fat side)
i want to send mr. brown some money so i can get this fixed. i want that carrier bearing back in the stock location and i dont want to start spending cash on u-joints without fixing the problem. sorry so long. i feel a little better now. help me guys !!!!!!!!!!!!!!!!!!

 

[elgecko]

Those shims you describe should be pointing the other way...have you checked your tire balance and/or wear?

 

[Yeti]

Yeah I have a cornfed 3" with AAL's in the back on my ex cab. I had the same vibration and so I added some shims to correct it. They were 3 or 4 degree shims, whatever is avaiable at the offraod shops around here I forget.

To calculate your correct angle(although it should be the same as mine) I used basically this tool: http://www.northerntool.com/webapp/...=200276974&cm_ven=TL&cm_pla=DF&cm_ite=collect

I measured the angle the driveline was at and then set it on a ridge on the 3rd member that was parallel to the shaft coming out of it and then took the difference between the two angles, which was something like: driveline 18*; pinion 12* so a difference of 6* but then I split this in half becuase as you level one side the other side levels with it and it will only take half of the degree difference(sorry I dont always make sense ... anyway its like 3 degrees and you want the fat part of the shim forward so it tips the front of the axle up.

 

[rojodiablo]

Those shims sound backwards. Possibly someone already had a problem, and tried to fix it with the shims. Sounds like you may have a bad driveshaft. I know you have probably checked all the ujoints, and the d-cardan, too. So that is why I am thinking propshaft. Maybe someone close to you will let you swap out shafts, and see if that fixes it. Good luck, let us know what happens.

 

[upwithit]

its not tires or wheels. shaft out, no vibration, shaft in ,vibration. it started as soon as i put that 2.5 aal in the rear. the truck was bone stock. what ever that wedge looking thing is under my springs came from toyota. yeti, you say the fat part goes towards the tranny and the other two guys advised that "sounds" wrong. i think the fat goes towards the tranny also. man i wish some one would say hey dumb ass, this is how to fix that problem. yeti, when you installed your shims did you leave the carrier bearing spacers in place or did you it back in the stock location?

 

[atwinda]

Have you checked to make sure the weights are still on your driveshaft? There will be a small weight tacked on to the shaft. If they are missing, take the shaft to a shop and have them balance it. I have no idea what the $damage$ will be.

 

[upwithit]

Have you checked to make sure the weights are still on your driveshaft? There will be a small weight tacked on to the shaft. If they are missing, take the shaft to a shop and have them balance it. I have no idea what the $damage$ will be.

yea, its ok. the day i lifted it, as soon as i put the truck in drive and drove it the first time it started vibrating.

 

[Yeti]

When i put my shims in I did it before I tried any spacers in the carrier bearing so yeah it was all stock there.

 

[NEV2DEP]

I measured the angle the driveline was at and then set it on a ridge on the 3rd member that was parallel to the shaft coming out of it and then took the difference between the two angles, which was something like: driveline 18*; pinion 12* so a difference of 6* but then I split this in half becuase as you level one side the other side levels with it and it will only take half of the degree difference(sorry I dont always make sense ... anyway its like 3 degrees and you want the fat part of the shim forward so it tips the front of the axle up.

thanks Yeti it took some searching but i finally found how to measure for what shims i need in terms i could understand.
Thanks Again
Later Joe