Carrier Bearing Drop?

I have installed a 2" add a leaf in the rear of my truck. After the install, I have begun to notice a vibration coming from under the truck when I let off the gas. It happens at any speed, but when the gas is applied it goes away. I am suspecting the carrier bearing. I dont think its gone bad as the truck just hit 60,000 miles. I guess the fix is to put a drop kit in right? How thick for a 2" lift? I really dont think the vibration was there before the AAL's went in.

 

I'd imagine a 1" would suffice. Even 1/2".

Also look at your pinion angle. Sometimes adding an angled spacer between the leafs and the axle point your pinion up a little bit.

You you talking 60k miles on your 2004?!

 

OME kit is 8mm for 3 inch lift..

 

You know, its weird. As I listen for the noise more, I hear it less. I may just make some 1/2" steel spacers and try it. I may just be hearing things. That and it seems most that do an AAL have no issues at all. And as of today...

 

Would the OME FK29 CB drop kit work with a first gen? Most places advertise it for 2005 and up.

 

Vibration on deacceleration is usually caused by a failing pinon bearing.

 

As I'm hearing it more, its only happening when my foot is barely on the gas. When I'm coasting or decelerating, its fine. When I'm giving it gas, its fine. Only happens when I'm barely giving it gas, I can feel it through the pedal mostly, but also under the truck through the floor. Only happened after my lift so I'm sticking to my carrier bearing theory. Checked and greased u-joints today and they seem fine, no movement. Little play in the carrier bearing so it's ok too. I'm hoping its just the angle. Gonna nab some 3/8" plate from work and make my own drop spacers this week.

 

Barely feathering the throttle is another sign (on deacceleration/coasting) of out-a-wack pinion preload. I takes 30 seconds and it doesn't cost a penny. Might as well check it?

 

Huh? Not familiar with that.

 

Wish I had that mileage

 

I doubt your carrier is bad. Get under there and shake it. It should have some play but not as much as mine. I just replaced mine yesterday at 125k.



Edit: Normally the vibrations from bad angles is felt during initial takeoff. I don't remember ever feeling vibes from deceleration. I would just go with your gut and nab that plate to see what happens.

 

Wont be that way for long. I drive 15k a year.

It has maybe at most 1/2" of play. Pretty normal based on what I've read

 

Gonna take it to the dealer tomorrow. After having my dad hear it, were having a hard time believing a 2" AAL could mess up the angles enough to cause the noise. Especially since Ive never read about anyone having this problem after installing a set of extra leafs. Thinking its best to have the dealer look at it and maybe confirm the issue before I throw money at parts I may not need.

 

I bought this and all my driveline vibration went away. I got a 3 inch lift

http://stores.streetacos.com/carrier-bearing-bracket-1-1-2-95-5-04-tacoma-4-lower-rear-lift/

 

Vibration would come from the pinion angle, not the cardan joint angle. The double cardan shaft is designed to have all of it's articulation at the cardan joint. If your rear doesn't settle over time and you still have issues I'd recommend shims. A small carrier drop isn't a bad idea either though, in combination with shims, if you're running a large lift.

 

Its at Toyota right now getting diagnosed. I only have 2" of rear lift. Never read about others having this happen with just a single AAL on a stock leaf pack.

 

Alright so I've made an interesting discovery. It's a long shot but it just may be the source of my issue. The shackle bushings. When I put my AAL's in a month ago, like an idiot I didn't put any grease on my shackle bushings or the bolts. I've noticed that over time they are creaking bad. Like 5 year old Silverado bad. They have gotten progressively louder, and my noise/vibration has done the same. Remember, this noise didn't start until after I put my AAL's in. Well, the other day when my truck went to Toyota about this issue, 2 techs checked it out and found nothing wrong and didn't hear anything during a test drive. I was dumbfounded, this is such a noticeable thing when your feathering the throttle, which is what I told the techs to do and still, they heard nothing. When I took it home, I didn't hear it either. I was stumped, until today.

I was getting out of my truck and noticed just how loud those shackles were with me just getting out. At first I thought nothing of it, then I started to put the pieces together. It was raining the day I had it in at Toyota. It was dry as a desert today when I noticed the noisy bushings. The techs and myself didn't hear it when it was raining out possibly due to some water acting as a lubricant for the shackles. Axle wrap, which we all know our beloved Taquitos are inherently known for, says that the axle pulls forward when the gas is applied, which also means the shackles pull forward too. When feathering the throttle, those shackles are moving rapidly as the gas is applied and taken off. That's where I think my noise is coming from. Of course, I could be full of crap and not know it yet, but replacing the bushings and greasing them up is where I'll start.