bwc3030

I did a muffler swap a couple weeks ago 18” magnaflow. $80 for muffler and $50 to install at local shop.

5.3

I had a magnaflow 18” muffler installed. It gave it a little deeper sound but not much. Wish I would have installed 14”. I think 14” will give it a little deeper than stock but not too loud.

I have had the coopers at for about 20k Miles. They where great for about 10k Miles. Then had vibration issues. Shop replaced one and they got them rebalanced ok but still slight vibration. I would stay away from them. I am going with Firestone At next as I had them on another truck and they were much better. For me anyway.

Took the head service advisor for a ride. He did feel the vibrations I am talking about. He said its defiantly a tire issue. He also felt it wasn't that much worse then a new truck. He admitted these are not the best riding trucks overall. Stated they have changed tires on other vibrations issues and helped resolve the issue. He suggested the Michelin ltx or AT ..his opinions best riding tires for these trucks. So I called the tire dealer back, told him dealer cant find anything wrong and said it was tires. Tire dealer says they road balanced and its not the tires? Geez.... I currently have Cooper AT3 tires, overall I have been happy with them very little vibration until now. I know they are not the best tire out there but not this bad. Question to those, has anyone changed tires and it helped the vibrations? if so what tire did you go with?

Dealer called and they cant find any vibrations that are 'abnormal'.. well I guess they are use to all the trucks vibrating so they cant tell a difference. Going to dealer today and I will take them for a ride to show them...... got a feeling this is going to be a battle.

Well add me to the list. I put all terrain tires on my new turn at 2 k miles. All has been fine until I turned 14 k miles. Now The truck shakes and vibrating starting around 65 mph. Had it at tire shop all day and after multiple road force testing and even putting on new tires. Truck shakes and vibrates still. Dropping off at dealer next week. Crap.

After putting in led they are starting to fade. I ordered HID kit from The retrofit source. After a couple of days with no shipping info. I contacted them. Well they are on back order. Would have been nice to know that before I ordered them. So anyone thinking about ordering for sierra may want to wait until they have them.

I am sure this has been addressed...but looking to add HID. While shopping around some sites have the option to buy the relay harness to power by the battery. Some say no need to use as can use the light wiring already from the factory. So do I need the relay harness or just the bulbs and ballast? Thanks

Same issue on mine. I recorded the sound and played it for the dealer. They never heard of issue before. They looked it up and per gm a known issue and just greased the springs it helped some but not much. It was much worse when it was cold outside. Since it's gotten hot it had stopped.

I have same tire but 20". The mpg stayed about the same for me. Maybe just slightly less.

There isn't much of a difference. But if I had to do it over again I probably would do 1.5 but I am happy with the 1". I think 1.5 is a good compromise.

There are several companys. I got mine from summit performance http://summitperformancecnc.com/

1" level with 275/60/20 tires.

I recently added 275/60/20 tires with 1" level. Can defiantly tell the front is higher with still some rake. I am also going to add spray in liner that will drop the back end some. If I had to do it over again I might go with 1.5, but overall I like it with the 1". Its much better than without.