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  1. T

    New member here trying to decide if I should delete the AFM or not. Engine is currently apart.

    I completely understand the skepticism, and I admit fully that I don't have any scientific data, but I did notice a 2-3 MPG loss after the change to 5W30. I fully agree that it is worth the loss of MPG for longevity though, it really isn't even close IMO.
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    Tran/torque converter advice

    At 70K miles on my 2017 I found out about these problems from a friend, and I did the following in this order with good luck so far: 1. Installed the Superior Sure cool thermostat bypass. 2. Changed the transmission fluid and internal filter. 3. Replaced the transmission pan when I did the...
  3. T

    New member here trying to decide if I should delete the AFM or not. Engine is currently apart.

    I disabled mine with HP tuners last year. I couldn't see any noticeable drop in economy on the interstate. I DID see a noticeable drop in economy for city driving, but that is almost certainly due to tuning out the converter clutch until 5th gear. I saw more of an economy drop switching from...
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    Spark Plug Fun - 2017 GMC Yukon Denali XL

    Thanks again for posting this. I tackled this a couple weeks ago, and removing the heat shield is the way to go. I just removed the bolts and shifted it down and forward about 6 inches and was able to gain the clearance I needed to access the plug from the top / wheel well. I had luck...
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    0W-20 to 0W-40?

    So far so good with the 5W30 (Mobil 1). It might be my imagination, but it seems to really run much quieter. I will say that the fuel economy decrease was more than I expected. My non scientific testing seems to indicate about a 10% drop in economy. Take that FWIW (probably not much)...
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    Spark Plug Fun - 2017 GMC Yukon Denali XL

    Thank you for posting this. I was going to attempt this today while replacing the struts, but I couldn't figure out how to get my hand past those heater lines to even remove the wire. I ended up punting on it for today as I didn't want to break those plastic heater line connections. I will...
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    Front End Replacement Parts

    I finally tackled this today. I went with the: KYB SRM4544. So far very pleased. Ride height seems identical, and the ride has stiffened back up. Only problem is now I want to do the back shocks :).
  8. T

    0W-20 to 0W-40?

    For what its worth, I disabled the AFM about 6 months ago via HP tuners while I was doing other preventative transmission service (along with disabling the TCC in 1-4 / zeroing out slip). Can't recommend that enough.
  9. T

    0W-20 to 0W-40?

    2017 Tahoe LT 5.3 So I took the plunge today and used 5W30 (Mobil 1). I was always a bit suspect of the thin oi (0W20), and with everything coming out related to the recall on the newer trucks it pushed me over the edge. It might be my imagination, but so far it seems like there has been a...
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    2015 Yukon - Change both diffs' oil and transfer case fluid early on

    I am wanting to change the rear differential oil in my 2017 2WD Tahoe. I am a bit confused on if I need to have the "limited slip" additive or not though. I have the following RPO codes for the diff: GU4 and G80. Which indicate a 3.08 with positraction / limited slip. I was going to use...
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    Front End Replacement Parts

    Thank you for this information. I have taken the picture of the sticker and I am in the process of deciphering the codes. So far I have ZW7 as being "Smooth Ride". I will keep looking to see if any others seem suspension related. I am also going to look into what it takes to replace the...
  12. T

    Front End Replacement Parts

    I am looking to replace both of the front struts on my 2017 RWD 5.3 Tahoe LT, 80K miles (due to one of them leaking all of the oil out). Looks like there are tons of choices available here...
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    2015 Yukon heater hose leak

    So after some thought, I decided to try to swap the hose without touching the T's due to my uncertainty with how / where to put the hoses once the T's are reversed (will white hose fit on black T and black hose on white T?). I avoided any damage to the T, and the T felt solid itself. All...
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    2015 Yukon heater hose leak

    So I went to two different dealers today to get the parts (I know I am over paying, but I want to do it today and not risk my wife melting the engine), and they were dumbfounded that these T's existed on a 2017. They even printed off a parts diagram for me that doesn't show them. They were...
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    2015 Yukon heater hose leak

    Thank you so much for this information. I have been searching for hours. You are a life saver.
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    2015 Yukon heater hose leak

    Hello, I have the same problem, except mine might be the hose itself. Either way I want to have the plastic T on hand when I replace that hose as I bet it is highly likely for it to break. I am running into a similar issue as the folks above in that I can find plenty of these T's for 2014 and...
  17. T

    External trans filter?

    I am thinking about doing this to a 2017 Tahoe (5.3 / 6L80). My main hesitation comes down to two things: 1. I don't want to cut the factory lines (want to be able to return it to factory condition easily if needed / wanted). This means I need some connectors to hook the factory fittings...
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