I put on a 2.5 rough country level kit and got a set of 265/70/17 (31.5 in.) and when I brake at 20+ the whole truck shakes. I have put the stock tires back on and there is no shaking so I am stumped on what it could be. I replaced the rotors and brake pads about 1000-2000 miles ago. Could these be caused by the rear drum brakes being bad and the bigger tires just amplify it? Or slightly warped rotors and the new tires make it more pronounced. I have a warranty on the rotors so I am just going to replace them again to start eliminating factors. The shaking gets worse the faster I am going or when going down a steep hill.

 

Check the aliengnment.

 

I haven't got one yet but the truck goes straight while driving and braking.

 

Try the parking brake test to see if the shake is coming from the front or rear. This works best when going down a hill or incline, so it lasts longer than on flat ground. Get up some speed, say 25 mph (or higher), then while holding the parking brake release at the same time, press down on the parking brake, lightly at first because you don't want to lock up the rear brakes while you are doing this.

If the shake is present, then the issue is with the rear brakes.
If the shake is not present, then the issue is coming from the front.

 

I have never heard of that dakotaff, I will try that.

 

I tried the parking brake test and it does shake when only applying rear brakes. Would this mean I have worn down drum brakes or something I am going to open them up and look at them soon.

 

also, make sure who ever did the wheels didn't warp a rim when torqueing them down, or look for missing weights

 

I torqued them to the right specs and it wouldn't be the wheels because if I drive with the parking brake slightly on it shakes.