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My 06 GMC made a strange sound when I popped the hood and listened to the engine before I bought the (new) truck. Asked a mechanic what the sound was. It was the roller lifters and rocker arms echoing thru the plastic intake manifold. An unnerving sound when you aren't accustomed to it. 126K...

Depends on how good your hearing is. If it sounds like a small engine with mechanical lifters type of tick noise, you are hearing the high pressure fuel pump operating. The high pressure pump makes a ticking noise whether the engine is cleaning or using direct or port injection.

Belden wires used to be sold by NAPA stores some years back. Great quality wires. Not sure who retails them now. You can look up Belden wires online and find retail dealers.

Amsoil signature. Better protection and less loss due to flash off from heat.

Perhaps the third time is the charm....or not.

With my truck the antenna wire was either shorted or had an open circuit in it, causing the head unit to fry. The head unit in my truck listed for around $3K. If your truck is in warranty, bring it back to the dealer to make a paper trail should the unit go south in the future.

My head unit went south in my new 2018 in less than two weeks.

Year round, almost every week, at least three times per month, for about a mile run on dirt.

I bought a can of CRC GDI IVD cleaner. Just waiting for the truck to get 15K on it so that I can clean the throttle body and intake tract.

I have about 4K miles on the system. It has not gotten any louder or developed any off tones. It sounds exactly how it did when it was new.

I put the same on my truck last year (V6). Made quite a difference in performance. I measured the pressure in my exhaust ahead of the muffler before and after replacing with the Borla exhaust. The stock exhaust had twice the pressure (inches of water on a manometer) than the Borla exhaust...

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I installed these LED reverse bulbs. Bought them from Amazon for under $22. Made an AMAZING difference, zero troubles with other electronics in the truck. I have been using them for over 6 months with no trouble. IF the bulb doesn't lite when you put it in, turn the bulb 180 degrees and...

Before replacing the CAT, I'd make sure there are no faulty spark plugs or coils causing intermittent misfires. Vacuum leaks, as well as bad injectors, can also be at fault. If the downstream O2 sensor voltage isn't fluctuating widely, the CAT isn't bad.

For bearings I always choose Timken. I used Timken bearing (hub) assemblies in my 06 GMC with complete satisfaction.

I use this:https://www.ruralking.com/gunk-tite-seal-autobody-undercoating-16-oz-t1616 It comes paintable and non-paintable. Both work equally well. Soak the can in a pail of hot water and shake well. The undercoat goes on evenly, and foams when it first contacts the surface. The foam dies...

I will check tomorrow morning and let you know. Don't discount salt laden rain and salt mist in the air. I used six cans to do my truck, and I am positive that I did an equal or better job than a pro would have done. If your truck were mine, I'd wash the undercarriage with detergent and let...

I personally like the General Grabber AT2. I had a set on my Sierra with over 60K on them when I sold the truck. The tread was still well over the wear bars. Those tires grabbed in dry, wet, mud or snow. They did make a bit more noise than a street tire tread, but not annoying.

I have an 18 TRD off road with 11K on the clock. The day after I bought the truck new, I wiped the frame and underbody down with Prep-sol, removed all heat shields and spare tire, lowered the gas tank, masked the sides of the truck with newspaper and painters tape and undercoated EVERYTHING...

The lumbar support was the first thing that I fiddled with while the salesman was prattling on endlessly about the truck. I told him if the seat doesn't fit my back, there is no sense in my knowing ANYTHING about the truck. It fit.