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  1. F

    Rear Differential: 9.5" 14 bolt question

    You won't like a sub rpm stall at all.. Stick with the stock 1600 or up... It will have so much idle creep in daily driving it'll wear on you. I accidentally ordered a 1600 once thinking I had an 1800 in it and it was awful. Remember, you have a lock up torque converter so the slip is non...
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    Rear Differential: 9.5" 14 bolt question

    I actually have done nothing yet... Been bombarded with "life" !
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    Won't move in 2wd

    It's a new posi carrier with the bearings etc that go with it to install According to the info I have it's the G80 factory limited slip diff that is the weak point and when it lets go it sends its shrapnel thru the diff taking everything with it - kinda like the 6l80 torque converter clutch...
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    Cat Back

    Magnaflow has very nice sounding street exhausts... Check to see if they make one for your application. They quit making the "kit" for my denali, but I contacted them and they turned me on to one of their dealers that made the "kit" for me.. I haven't put it on yet, but I have magnaflows on...
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    Build thread - 3.08 to 3.42 front and rear gear change

    Ah, Yeah ! Definitely would cause knock sensor with broken OEM mounts.. MikeZ71 Just had a long thread and successful fix that ended up being loose/missing motor mount bolts that caused "knock sensing"
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    Need opinions: 3.42 vs 3.73 GR

    You'll want your 6l80 to have lock up at the appropriate throttle/load to keep your trans heat down. Nothing wrong with using lockup in 4th gear. (1-3 gears is dumb from gm)
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    Build thread - 3.08 to 3.42 front and rear gear change

    I noticed zero knock sensor extra activity when I installed both H2 motor mounts... I did it like 3 years ago.. I still have my OE GM low mileage mounts in the boxes still !!!
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    Build thread - 3.08 to 3.42 front and rear gear change

    According to my research the 8.6" 10 bolt rear and the 9.5" 12 bolt rear use the same rear driveshaft (and U joints). But Yeah, do it once... do it right !!
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    Won't move in 2wd

    I just haven't gotten the motivation to put in my 9.5" rear end out of a 2WD Yukon/Esky..... Yet... Or just beef up my G80 - I already have all those parts too... So many projects
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    Won't move in 2wd

    Nope..Not Me
  11. F

    BOGGING BADLY! - SOLVED

    Sounds like it ! That would cause some noise right at the engine block So the knock sensors would certainly pick it up and think its real knock
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    6l80 tcc slip tuning stock clutch

    They also used the 6L90's in the cadillac ctv-s supercharged 6.2L They are supposed to hold a little more torque , hence 90 vs 80 I thought some parts were interchangeable on these and the size diff was like 1 inch or so... I've never physically touched a 90E I imagine the "tuning" programming...
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    Anyone else’s washer fluid make this noise?

    ONE Tank... 2 pumps... Just 1 resevoir !
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    2014 Yukon slow acceleration

    I really think you have bad cats !! meow
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    BOGGING BADLY! - SOLVED

    Just to add to earlier post.. .58 g on the air mass pid is really not much. Idle is about .20 ish or less. Medium throttle is around the .50 ish and deep into the throttle is near .90 ++ Of course this is very general and what it would do running properly..
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    Gas Mileage

    My 14 has a 33 gallon fuel tank.. So even just in town I can get about 330 miles per tank depending on climate etc IDK how many gallons the OP's tank is... but that's crappy mileage IMO no matter what
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    2014 Yukon slow acceleration

    Check your starter/ flexplate. The starters on these will start to rattle badly but not cause a starting issue. This may be setting off the knock sensors. Check this for mikez71 as well on his problem
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    BOGGING BADLY! - SOLVED

    Your fuel trims are well within acceptable ranges... I think you've found your issue.. Cats are bad. Classic symptoms of cats that have come apart and clogged up the exhaust is my guess too
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    2011 LTZ Tahoe towing question

    I tow a lot heavier than this... But I've done the lower control arms, upgraded sway bars on the Yukon, and air bags in the rear springs. Mine tows very well. I use the equal-i-zer system for WD/ Sway. I've used a few diff WD hitches over the years on a couple other trucks.. This Equalizer...
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    AFM

    Disable the dang DOD and drive on. You will be doing what is possible electronically to extend the life of your cam/lifters. I can't see any reason it would affect the "oiling" system negatively in any way
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    cam upgrade question

    Thats the cam I have in my 6.2 It needs a bit of tuning as it changes the airflow model quite a bit.. I like it. It was the smallest VVT non-dod cam I could find as I use my Yuk to tow. It's a very good cam IMO. As far as the OP's Oil pressure... If his engine still has DOD or VVT he needs to...
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    Value question: OEM manifolds or shorty headers?

    To me, Headers are better. Little bit lighter and oddly in my 6.2 spark plug access was a bit better. I still have my OE exhaust components in storage, but I never weighed them or anything. IDK if the 6.2 manifolds are the same part # as the 5.3 manifolds though
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    Engine mount

    Not that it helps with this thread... But Holy **** those Hummer motor mounts have gone UP in price.. I think I paid about $105 EACH when i did mine 4 years ago. Glad I got on this forum and got em in.. I still have my stock one.. They were fine, I was just upgrading and this forum helped out...
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    2010 Yukon Denali Overheating when Towing

    This is exactly why I put a manually controlled Efan on my derale trans cooler. When towing at hwy speeds, the engine fans don't come on but my trans temps continued to climb. Now I can just flip my toggle switch to bring fresh air thru the derale trans cooler independent of air incoming to...
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    2010 Yukon Denali Overheating when Towing

    My true GM replacement pump on mine from a few years ago has threads on the hub as well. I just left the plastic protector piece on it so I won't cut myself on it. The E fan strategies on these gen 4 gm900's kinda suck in my opinion. I'm sure it has to do with cafe or epa crap. At highway...

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