shakenfake

Yes I would go that route because you may be doing damage.

Get a code scanner and scan for codes

https://www.amazon.com/Sierra-Chrome-Housing-Headlight-Replacement/dp/B012H6MMR8/ref=sr_1_5?keywords=2011+gmc+sierra+clear+headlight&qid=1652811784&replacementKeywords=clear+headlight&sprefix=2011+gmc+sierra+clear+h%2Caps%2C120&sr=8-5&vehicle=2011-48-548------------&vehicleName=2011+GMC+Sierra+1500 These

Sounds like you should take it to the dealer. You don't need two batteries just because it is a diesel lol

My opinion is 3 if you can do it yourself.

If you pull the valve covers off you can find out if you have the Castech heads or not. Depending on the casting number you can tell without even doing that. My low coolant light came on a while ago as well. Did it on my way to my girl's house after working. Driving home from hers to mine it was gone and back to work it was gone as well. Dumped in a water bottle to be safe. Last time I filled it up from a coolant leak I just did the minimum fill.

Legally GM has to provide every part for a vehicle for 10 years.

Most likely how it is going to be everywhere

Laying frame on the 6s?

It would probably keep the engine bay cooler but you are not going to gain performance.

8 more days bud

Either I want to be buried in a solid gold casket so nobody can get my money or possessions when I die OR Just dump me in a lake

I am thinking it is related to that exhaust leak for some reason

There are some things you have to do for it but honestly off the top of my head I cannot remember. Just search for "6 gauge cluster swap nnbs" are you will probably find the information you want.

Not the same engine family but I do have a Flow Master American Thunder system on my 6.0 with long tube headers, I believe that is a 40 series muffler(?). I do not have any issues with it. I do not think it drones at 2200 RPM cruising down the highway and I think it sounds like a good system. Just my $.02

Glowshift is pretty decent or just do the OEM gauge cluster swap and you are good to go

You can smoke test the tail pipe and see where the smoke comes out to test for an exhaust leak as well

Off the top of my head the averages for fuel mileage for the vehicles in my immediate family go like this driving to work and back and daily tasks no road trip type highway mileage: 2011 Cadillac SRX 3.6 all stock: 17 MPG 1999 Chevrolet Silverado 1500 6.0 modified and lowered: 17 MPG 2012 Audi A3 2.0 TDI all stock: 28 MPG 2016 Audi A6 2.0 TDI tuned: 30 MPG 2019 Mercedes GLC300 all stock: 19 MPG 2007 Honda Civic 1.8 all stock: 26 MPG 2017 Toyota Corolla 1.4 all stock: 27 MPG 1996 Impala SS 5.7 all stock: 17 MPG Now saying all of that both Audi's are diesel which is not a factor that I included in the averaging. The Impala has some problems with it at the moment so that isn't super accurate. Like I said, it's an average based on arbitrary numbers. YMMV

You don't need to replace the entire motor. Just swap the cam and the lifters and you should be good to go. Look for the delete package.

That is correct @Erny1286 Just going to be not as good of an engine as the Gen IV 5.3

Like I said it is national average. Definitely not $2k lol Also this is a little dependent on the gas price fluctuation near you. It is not entirely accurate but it gives a decent insight. I was a little off on the calculation though. National average of miles driven a year is 14,263. The average fuel economy for cars is 24.2 MPG. 13,476/24.2=556.86 Gallons of Gas a year. So if gas was $3 for simplicity sake, 556.86*3=1,670.58. If gas was $4 it would be $2,227.44 so only $556.86 more. Trucks are 17.5 so 13,476/17.5=770.06. So it is an $770.06 increase a year going from $3 to $4 The conversation was not about the ripple effect. Just about the price to fill up your vehicle. Average Fuel Econ: https://afdc.energy.gov/data/10310 Average Mileage Per Year: https://www.fhwa.dot.gov/ohim/onh00/bar8.htm *Last modified March 8th so pre-covid numbers which should be a little more accurate in my opinion.*

I have one driving vacation planned this year and that is it. An hours drive down to Glen Rose in my girlfriend's Corolla. I mean really if you just add the extra money it takes you to fill up it's only like $400 a year if you drive the national average.

Only 10 days!

4.3s have distributors up until 07 I believe. 5.3s never used them.

What diyer2 and grumpy said are true no need to worry about something that most likely will never happen to you BUT I hear a lot of this stuff saying how frequent oil changes are why the lifters never fail and that is a laughable claim imo. The K2XX with AFM that my father owned got it's oil changed whenever the truck's oil light popped on, and we all know that thing comes on when it feels like it, and that truck lasted over 150k miles and went on many a trip with no issues. I know some guys who change it religiously at 3.5k-5k and they still had failures. I just think it is mostly random.