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2018GMC

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Everything posted by 2018GMC

  1. I live at 7000' high altitude. I run 87 for daily driver use but put premium in when dropping down to lower altitudes and if going to tow. Never had a knock sensor code or heard any pinging / knocking. Premium is .40 - .75 cents more per gallon vs regular 87 octane. Includes sams club.
  2. I considered upgrading to the GM Big brake kit offered on K2xx trucks. I recall you can run 18” wheels from T1XX truck /suv or a 20” wheel from K2xx truck. GM still puts a 17” steel spare tire on vehicles with big brakes from factory so if you get a flat on the front you need to move a wheel from the rear to front then put the 17” spare on the rear because it won’t clear the front big rotor / caliper. Stock wheels on t1xx trucks have different offset to clear the larger calipers.
  3. 6.2 L92 VS 6.2 L9H. L92 2007-2008 L9H 2009-2013 https://help.summitracing.com/app/answers/detail/a_id/4851/~/intro-to-the-l92%2C-l9h%2C-and-l94 Isn’t the L92 rated lower hp and torque vs the L9H? Thought the L92 was 380hp and L9H was 403hp. Main differences were cam and vvt phaser. L9H was flex fuel compatible. L92 not. I’ve been looking for a 2009 Tahoe 4x4 with the 6.2 L9H but they are kinda rare since 6.2 was only offered that one year in Tahoe LTZ trim only. This one year config also came with larger rear axle and 6-speed auto. http://www.automobilegt.com/Brochures/Chevrolet/2009_Chevrolet_Tahoe.pdf GMT900 Suburban never got the 6.2. Of course 2007-2013 Yukon and Yukon XL Denali and Escalade came standard with the 6.2 but they were AWD, no selectable 2wd, auto 4hi, 4lo transfer case. Odd the brochure lists 6.0 available in half ton suburban. Don’t think it ever was except in the hybrid versions and the 2500. These are getting cheap-ish as the years and miles pile on… What years had valve spring failures or is it any year 6.2?
  4. If there was a dealership that had a service department that’s worth a $hit near me, I’d do the TSB but I’ve been to both the GMC and Chevrolet dealer and they both suck. Several hours for a oil change, they don’t call when it’s done. One of the dealers smashed my Evap canister using it as a jack point. Didn’t find out about that until weeks later when I got a check engine Evap small leak. Of course both denied responsibility. So here I am doing it myself The filter will get changed when I do the work and the pan cleaned since the dealer just hooks up the flush machine and then they’re done.
  5. Only other compatible fluid I can find is Amsoil Signature Fuel Efficient ATF which is the most expensive at $18.69 per qt, $14.39 per qt if you buy the gallon and you are preferred customer. https://www.amsoil.com/p/signature-series-fuel-efficient-synthetic-automatic-transmission-fluid-atl/?code=ATLPK-EA Looks like I'll prob be going with Mobil 1 LV Blue label 124715 for &7.36 per quart when you buy the 6 pack
  6. Looks like the Mobil 1 LV Blue label 124715 is $46 for a 6 pack on the jungle website. They have a pic of the old black label but several reviews say it is actually the Blue label 124715 Amazon.com: Mobil 1 Full Synthetic LV Automatic Transmission Fluid HP, 6-Pack of 1 quarts : Automotive What about using Valvoline Multi-vehicle 773775? Valvoline MaxLife Multi-Vehicle Full Synthetic Automatic Transmission Fluid (ATF) 1 GA - Walmart.com
  7. I'm thinking of doing a DIY at home flush on my 2018 6.2 with 8l90. Only has 20k on it and shifts great but have heard that the OEM fluid is hydroscopic and slowly absorbs water over time which causes shudder and shifting issues. I'm betting I need 12 quarts to do the flush at home, possibly more if I want to change transfer case atf as well which holds 3 pints. Looks like I could do this at home DIY flush in the driveway by: 1. Drop pan, remove old fluid and clean pan, replace filter. 2. Install pan and add 4 quarts of fluid. 3. Remove the cooler block, inserting some poly line in the cooler port on side of transmission towards front of vehicle. 4. Fill transmission with 4 quarts of new fluid. 5. Run engine for 45 - 30 seconds to flush torque converter. Repeat until fluid is clean coming out of poly line. 6. Blow cooler lines out with compressed air 7. Replace cooler lines onto side of transmission. 8. Fill with new fluid and check level. 8L90 flushing proceedure.pdf 8 Speed Fluid Level Check.pdf 8 Speed Fluid Fill Procedure.pdf 8 Speed Fluid Change.pdf
  8. I'm thinking of doing a DIY at home flush on my 2018 6.2 with 8l90. Only has 20k on it and shifts great but have heard that the OEM fluid is hydroscopic and slowly absorbs water over time which causes shudder and shifting issues. Looks like the Mobil 1 LV Blue label 124715 is $45 for a 6 pack on the jungle website. I'm betting I need 12 quarts to do the flush at home, possibly more if i want to change transfer case atf as well which holds 3 pints. After how many quarts did you notice the fluid coming out of the return line get cleaner? Looks like I could do this at home DIY flush in the driveway by: 1. Drop pan, remove old fluid and clean pan, replace filter. 2. Install pan and add 4 quarts of fluid. 3. Remove the cooler block, inserting some poly line in the cooler port on side of transmission towards front of vehicle. 4. Fill transmission with 4 quarts of new fluid. 5. Run engine for 45 - 30 seconds to flush torque converter. Repeat until fluid is clean coming out of poly line. 6. Blow cooler lines out with compressed air 7. Replace cooler lines onto side of transmission. 8. Fill with new fluid and check level.
  9. Looks like I could do this at home DIY flush in the driveway by: 1. Drop pan, remove old fluid and clean pan, replace filter. 2. Install pan and add 4 quarts of fluid. 3. Remove the cooler block, inserting some poly line in the cooler port on side of transmission towards front of vehicle. 4. Fill transmission with 4 quarts of new fluid. 5. Run engine for 45 - 30 seconds to flush torque converter. Repeat until fluid is clean coming out of poly line. 6. Blow cooler lines out with compressed air 7. Replace cooler lines onto side of transmission. 8. Fill with new fluid and check level.
  10. G218 ground shouldn't be an issue on a 2018. I would occasionally get service stabillitrack on startup but thats it. Check and clean all your grounds, especially the engine ground to body. There are 3 frame grounds: 1. under driver seat on frame 2. behind front passenger wheel well 3. on top of spare tire by trailer tow package. Your negative battery cable may have high resistance and need replaced. Dealer replaced mine and it didn't really change anything but they said it was out of spec for resistance. Here is the official Technical Service Bulletin TSB 18-NA-161 1..7 (nhtsa.gov)
  11. My 2018 6.2L L86 just rolled over 20k miles. I change oil every year and usually only put 4 - 5k miles on in that time. I've been running mobil 1 Full Syn and Pennzoil platinum. Recently joined the Amsoil club and will probably run the OE oil since I am changing with low mileage intervals. Not sure if the XL would benefit me much unless I start putting on more miles between changes. Walmart online has a 2pk of Mobil 1 212a filters for $18 which seems pretty good. I have run the Fram Ultra XG10575 after the mobil 1 m212a and oil looks the same at 4500 miles. Rockauto has cheapest price on fram before shipping but they limit order to 1 which kills the low price. Here's a youtube video comparison of m1-212a vs Fram XG10575.
  12. Yes. I used the two wires from the Bose sub plug as the speaker level inputs on the lc2i. That’s the thick black speaker wire I ran from Bose sub plug into LC2i left speaker input. Since there was only one speaker level input from sub I ran it to the left input on the LC2i then just used some short wire to jump the left to right input on lc2i. Not sure if that even mattered. My JL XD300/1v2 turns on when it senses audio from the rca input so no remote wire needed.
  13. @Spurshot Thanks for the reply and your detailed post. I do all of the maintenance on my older trucks. Done oil changes and bilstein 5100 2” lift on the 2018. Your post made this look super easy. I’ll keep an eye on the leak and prob just do it myself. I checked bolts. They are tight and T30 torx. Must be shrinking oring.
  14. Guessing most don't have a leak or haven't noticed it since you can't see unless you remove the "batwing" air intake. I found this old thread and will prob just replace o-ring myself if it continues to leak in the next few weeks / months.
  15. I used the LC2I and one of the wires off the factory Bose subwoofer plug for the amp power signal. Still rocking my JL stealthbox in center console. Has been good except had to reseal stealthbox box where woofer mates to box there was an air leak. I mounted amp an lc2i under the rear seat. Ran all the wires along the passenger side under door sill covers.
  16. Hi all, Anyone else have a small oil weep on front of engine above crank pulley? I think it’s the VVT cam phaser. I removed my air box and tube. Noticed a small oil weep. It just surrounds the sensor but not running down timing chain cover. Cleaned it off with carb cleaner. My 2018 6.2L just turned 20k miles. I’m out of bumper to bumper but still have a few months of power train left. My dealer sucks so if it continues to weep may try replacing gasket myself? Has anyone done this? Any other known leak areas on this generation of engines?
  17. I used the LC2I and one of the wires off the factory Bose subwoofer plug for the amp power signal. Still rocking my JL stealthbox in center console. Has been good except had to reseal stealthbox box where woofer mates to box there was an air leak.
  18. Torqued my motofab 2” rear lift block with new ubolts to 100 ft lb. Have driven 1500miles and recheck torque. Were still at 100ft lb.
  19. @doubeleive I’ve owned several sets of BFG KO and the KO2. They are very quiet for an aggressive all terrain but like all tires get noisy once they wear down to less than 50%. The noisiest tires I had were Cooper Discoverer ATP which is very similar to their AT3. They started out quiet but at 60% tread left they were extremely noisy on the highway.
  20. @M1ck3y Yes I can. Fun fact the passenger side of the bumper has a larger gap between fender and bumper than the drivers side. Came from the factory that way. Most people don’t notice but I can’t unsee it with my OCD
  21. Installed bed rug which happens to match snugtop carpet. My first bed rug and it’s very nicely padded on the bottom which makes crawling around in bed pain free. Also has a foam on the side’s which is a small amount of insulation when truck camping 🏕 My truck came with the spray on bed liner and the Velcro bed rug uses does not stick well to the bed liner even after using their promoter which they were very stingy with. Not a big deal I guess since it’s mostly to prevent air from getting under it and ballooning up at highway speeds. Not an issue with a tonneau or camper shell / topper.
  22. Got new BFG’s! Tire prices supposed to rise again so decided to drop $$$ and upgrade now. Bilstein 5100 on top notch in front for 2” lift. 2” moto fab block in rear replacing factory 1” block raising rear 1.25”. First pic Goodyear Fortitude HT 265/65/r18 31.5” Second pic BFG KO2 275/70r18. 33.2”
  23. Discount tire matched the eBay tire deal that’s going on expiring today so I decided to drop $$$ and get new BFG’s Bilstein 5100 on top notch in front for 2” lift. 2” moto fab block in rear replacing factory 1” block raising rear 1.25”. First pic Goodyear Fortitude HT 265/65/r18 31.5” Second pic BFG KO2 275/70r18. 33.2”
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