Rotational vibration under 20 mph

^ rotors

 

I've tried that. The vibration does not go away when shifted into neutral. The vibration only occurs under 20 mph but only happens when the vehicle is rolling. So technically between 1mph-20mph.

 

I'll give that a try. I have replaced my needle bearing with the ECGS about 2 years ago. The vibration didn't start until after the lift about 2 months ago.

Anyway to test that other than freely rotating the rotor, or new rotors? I have already spun both front rotors and there was no drag or resistance. Do I need to test the rear, and if so how?

 

Does this look excessive?

https://youtu.be/QSheUjYAM04

 

Some times with rotors can't do it umless they are under braking pressure. If the vibration goes away in neutral then it's driveline related. I had to shim my rear axle to get rid of my vibes at 45 mph

 

https://www.tacomaworld.com/threads/drive-shaft-vibrations-solved-step-by-step.244535/

Start reading.

 

Can’t really tell from the video but it looks right...try reverse check the other side...Motor should move not more than 1 inch. Check transmission mount grab the tail shaft rock it up down back and forth...be strong it’s heavy should be very little play.

If the brake drums were bad in the rear you would feel it in the pedal.

Upper UCA’s are stock or aftermarket?
Tire wear is good? Even all the way across the tread?

Check tires for a broken belt...the sidewalls of the tires should be smooth and consistent no bulges

 

I already shimmed my rear axle, and the CB. I've made numerous adjustments but no change in vibration. This leads me to believe it's not drive shaft related since "messing" with it changed nothing.

I already have. My results are here. Like I said above, I shimmed all different kinds of ways but no change in severity or frequency of the vibration.

I'll check the transmission. I checked the fluid level and it looks low so I'm getting some more fluid right now. Maybe that's it. I can feel the vibration in the pedal too. Anyway to test rear brake drums? Aftermarket LR UCAs. Tires are evenly worn with less than 1000 miles. There's no bulges in the tires.

 

I think it's the front rotors or something is loose on the front brakes.

 

You can pull the rear drums off...should be smooth on the inside no groves of any kind...the drums have to be a minimum thickness and that number is stamped somewhere on the drum itself. The front does like 70% of the stopping...if the pedal is pulsing the problem is usually in the front. Maybe the front brake pads are getting hung up on the brake caliper as the pads wear down they need to move closer to the rotor.

 

Somewhere online recently, I saw a video from a camera that was mounted under the rear of the vehicle facing forward. The driveshaft looked fine at slow speeds but vibrated badly at higher RPM as I thought the carrier bearing was going to explode. I know you checked the bearing, but what you see at rest is different than what you might see with rear wheels off the floor and and somebody pressing on the gas as you look from underneath. I can't imagine the bearing being bad on a 2015, but I have no idea what year Tacoma that was in the video nor its mileage.

 

I can definitely give that a shot. Although right now I'm in the middle of moving. The movers came today and started packing up so I think this will have to be on hold. I took it to the dealership for a "transmission shudder", but of course they couldn't duplicate the problem. Since I'm shipping my vehicle in about a week and it'll only have at most 5 miles put on it in the next 2 months, I'll just let it be and wait until I get back home. My brother is a Mercedes Benz technician and also knows the Toyota service department manager next door pretty well so he said they'll take care of it no problem. I'll post back after that. Thank you all for the help and suggestions. I can't wait to figure out what the hell it is!

 

Driveshaft still spins while moving in neutral

 

I’m willing to bet it’s driveshaft angle related. Low speed vibes are directly related to the U-joint angles. These trucks are notorious for them after being lifted. Best thing to do when you lift is get a 1 piece driveshaft vs trying to shim to fix angles.

 

Yes but it's not under load . If it's his rotors (warped) he will feel it and can rule out the drive line.

 

It does not have to be under load to get vibrations from the driveshaft if the u-joint angles aren’t balanced, or the driveshaft itself is out of balance. As long as it is still spinning, you will still feel the vibrations from either of those issues.

 

Considering that the vibrations are only under 20mph, would that mean that it's not drive shaft related though?

 

Nah low speed vibrations are a key characteristic of improper driveshaft angles after lifting

 

Try a 3/4" shim at the CB, remeasure your angles.

 

Before I keep trying all different shimming options again, is it possible to remove the rear drive shaft and drive in 4hi or something to be able to eliminate it from the equation? This way I'm at least sure that that's what's causing the problems.