All Pro Standard 3" Leafs causing vibration?

I see there's a few threads on vibration, but I couldn't find any that directly referenced the All Pro leafs.

So I lifted my 98 4WD V6.

I lifted the front on 5100's and ToyTec Eibach coils set to 0".

I drove on it for about a week while I waited on my longer u-bolts. The were no changes to my front end or any vibrations.

This weekend I lifted the rear end. I removed the OEM leafs and replaced them with All Pro 3" standard leafs. Changed the rear shackles form the 2.5" shackles I had on there to OEM shackles. I'm also running 5100's in the rear, which I was using with the 2.5" shackles.

Now I have a vibration in the truck, which I believe is coming from the rear. I don't feel a shake in the steering, I feel it throughout the whole truck. It only happens from 20 mph to 30 mph.

Are the 3" leafs causing this vibration or did I do something wrong.

I'm taking the truck to get aligned today hopefully, but I know they only do front end alignments on the trucks.

Again, I didn't have any issues with the 5100's set to 2.5" and 2.5" rear shackles.

I didn't have any issues when I had the front lifted to 3" with the Eibachs, and left the rears running the 2.5"s shackles with the OEM leafs.

It only started with the All Pro 3" Leafs.

Any help would be greatly appreciated!

 

Lift vibrations occur no matter what brand of lift. Every vehicle is different though. Sounds to me like the vibe is from the 3" lift. Those leafs should settle a little which might make the vibe go away. Or may not. U could try axle shims or carrier bearing drop to get rid of the vibe. Or just deal with it depending on how bad it is.

 

Its odd.

I feel it during acceleration and deceleration, between the 20 and 30 both ways.

It seems like the all pro's were more than a 3" lift.

I am definitely raking now, about an inch plus on the back versus the Eibachs on the front.

Will the new leafs settle much?

 

Once they break-in it'll drop a little. Should drop down to 3". Go do some flexin'. That'll speed up the process.

 

It has nothing to which brand leaf springs. Its your driveline angle. I did my rear first about 3 weeks ago.I have a slight vibration 5-15 mph I have a carrier drop bracket on order to resolve it hopefully. I haven't done the front yet waiting for better weather.
My driveline angle before lift 3.1 degres after 5.5 thats why i think a carrier drop bracket will help. I installed allpro's standard 3" leafs