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  1. M

    I believe my front differential mounts are shot....got a quick question

    So I posted on another thread what could be the cause of a slight thud when off the power and the trans downshifts. Like 4th to 3r and even 3rd to 2nd or 1st. It's almost always power off that you hear/feel the low thud. I have NO slipping on the trans. I've changed its oil every 30K (full...
  2. M

    2008 Rear Suspenssion Noise

    Folks: My trusty 2008 Denali XL now has 202,200 miles on it. Motor and transmission going strong. I have a consistent rear main seal leak that I just "deal" with as I don't really want to do all the work to replace it. Well, there is a new potential issue that I don't think I should deal...
  3. M

    Oil leaking options...hear me out first

    Folks: So 2008 6.2L is going strong. Past year it does leak when oil is hot and all around the engine block (back side) by drain plug, starter motor and oil filter. I replaced my drain plug. I've replaced the oil pickup gasket last year, which required oil pan being dropped. I put new oil...
  4. M

    Which mounting brackets do I replace?

    Wife’s ‘08 with 200k has been making a consistent downshift thud for over 4 years. Sound like it may be a transmission mount. Both motor mounts have been replace(2 years ago). Wondering how many mounts the transmission has and if it could also be from the transfer case. you mostly hear it...
  5. M

    Seeking prefered methods to catch dripping oil

    Folks: Our beloved 2008 Denali XL just likes to drip oil. She has 198K and I know my rear main seal is likely the culprit. Drips about 3 or 4 drops when hot, after you pull it into the garage. I bought some tinfoil turkey basins often used during Thanksgiving when bird cooking. It collects...
  6. M

    Trouble removing front differential fill plug

    Folks: I've posted about my noisy front differential and got good feedback about diagnosing it. One idea is to pull the drain plug and see if I have metal shavings. Well, last fluid change I could NOT get the fill plug out of the diff. I stripped it rather bad and eventually just filled it...
  7. M

    Buzz noise....really don't want to replace coils if they are not bad

    Maybe that subject line got you asking, "What in the world"? This thread from a few year ago.... https://www.tahoeyukonforum.com/threads/2007-suburban-lt-buzzing-sound-from-radio.43303/page-2 That guy had/has the same buzz as I have. I've had it for about 3 years and I'm finally deciding to...
  8. M

    Wiper hose parts....what the???

    Folks: Driver side wiper hose, of my 2008 Denali XL, snapped right at the connection that goes down into the cowling. So you see hose come from the plastic part on the car but the little nub at the cowling is broken. Called local GMC dealer to find out if there is a replacement part that...
  9. M

    Could a CV axle be the cause?

    Folks: I've posted a bit about an odd noise in the past....still considering what could be the cause before I get too into the project. A few facts first: Vehicle: - 2008 Denali XL (6.2L, of course) AWD. - 198K miles - All drive line oils changed every 30K (Tranny, transfer case, front...
  10. M

    How do I determine the exact model of my front differential?

    Folks: This Saturday I'm going to have my 2008 Denali XL, that has 192K miles, up in the air to listen and look for the cause of rotating noise when it is under power. I think the front differential or transfer case is the culprit. Both front hub assemblies have been replaced in the past year...
  11. M

    Front Diff or Transfer case of tranny.....

    Folks: 2008 Denali with 191,000 miles. I’ve changed all fluids as I should (usually around 30k) with proper types; engine when the I reach 20 to 10% of the monitoring tool. When driving and under power, you can hear engine noise but it’s often not quite as loud as a general humm. If you let...
  12. M

    Is this part replaceable?

    Folks: My wife's Yukon has a damaged right mirror. See pictures. Can that black portion be replaced? I would hate to have to repaint an entire mirror if that black section comes apart from the painted part. Also, this mirror no longer moves in and out. Is that gear replacement/fix expensive...
  13. M

    2008 Denali XL - 185K miles....when will the "big bill" come callin'?

    Folks: As subject line says, my 2008 Denali XL has 185K miles. I've done the majority of the work on it over the past 8 years. I bought it with 52K miles in 2011. Been a good ride for us, but not the lease expensive to drive. I've put $6,269 in "Maintenance" and $7,079 in Repairs. I'm...
  14. M

    Can't set electronic clock...eh??

    Folks: Unplugged battery for a few hours while I installed a new throttle body and other engine items. Upon power up, the clock has lost its time--no surprise; however, as I go into the menu to set it, no numbers appear in the hour or minute fields for me to go up or down with. In other words...
  15. M

    Awe man, did I just damage my throttle body?

    Folks: Replaced my Yukon's (2008 Denali 6.2) water pump. It was failing big time but I caught it before damage occurred. HOWEVER.... ....in the process I didn't realize there were 6 bolts to the water pump; thought there were 4. So when it didn't come off the block at 4, I decide to take a...
  16. M

    2008 Denali XL 6.2L Low Oil Pressure - Fixed

    Today I tackled my constantly low oil pressure by replacing the oil ring that fits on the oil pickup tube just as it connects to the oil pump. The pictures below are the cold before and after the fix; hot before and after. My Yukon has 178K miles and I run 5W-30 with an AC Delco oil filter. I...
  17. M

    Has anyone replaced mouting bushings on their front differental or transfer cases?

    Folks: As posted on another thread, I replaced left front axle and hub assembly on my 2008 Denali over the weekend. I noticed, when removing the axle nut, that I was able to get a fair amount of differential movement (up and down) if/when I rocked the axle. I eventually froze the hub assembly...
  18. M

    Diagnose sound....could be the hub or differential?

    Folks: 2008 Denali XL with 175K miles. Wife's car. I got in last week to drive us up to a cabin and quickly noticed a humming sound that appeared to be more from the front left (driver side) area. It increased in frequency as I sped up but when approaching freeway speed it became hard to hear...
  19. M

    CV Axle nut...what size is it?

    Folks: Doing a left front Hub replacement. Want to make sure I have the right size long socket for the hub nut for the cv joint. I drive an ‘08 Yukon Denali; I’m sure all are the same, but just in case. I’ve ordered ACDelco replacement HUB and knockoff axle since I’ve heard the hub should be...
  20. M

    Rear main seal or oil pan leak?

    Folks: 2008 Denali XL, 165,000 miles. Original trans, motor and other majors, but lots of repairs in other areas (lift gate, auto ride, 2 sets of cats, door hinges, etc). I noticed 1 or 2 drips of oil a day on my garage floor. Got under it to take a look. Small oil accumulated between motor...
  21. M

    2 new Cats (entire exhaust assembly), 2 new engine mounts & right side axel all replaced for...

    $2100. That includes parts and labor. Yukon Denali XL has 152,000 miles. Cats wouldn't pass emissions, engine mounts were toast and the right side CV boot was gone. I thought that price was reasonable. The installer used an OEM exhaust assembly too, so its up to speck. To be honest, I...
  22. M

    Ugh, P0420 on my 2nd set of cats

    Folks: I replaced both cats at 94,000 miles on my 2008 Denali (6.2). I was able to pass emissions then (2013). No issues till summer of 2015, darn P0420 came on again just about time for registration renewal. However, I went to the dealer and paid to have my ECM flashed with the update that is...
  23. M

    Liftgate Latch, Motor or Module? How to know which?

    Folks: I have another thread where I asked for general help diagnosing my lifgate issues. I thought I'd reach out in a different thread to see if anyone can help me--and possibly others--with the process to properly diagnose the issue. From what I can tell, we have 3 major components in...
  24. M

    Liftgate diagnosis help

    Folks: A few weeks ago on my 2008 Denali XL the liftgate stopped working automatically. Switch set to open in side, push the button and no lift. You don't hear the motor run either. That said, the lock mechanism always hums and runs. I suppose it is unlocking or locking (not sure). I will...
  25. M

    Just replaced rear shocks and air compressor, now get stabilitrack error

    Folks: I had suspension system error for a while. Knew my right side rear shock was blown and probably blew out my compressor. Replaced both rear shocks with Arnott shocks and new compressor and dryer. Got it all in place, powered up and the compressor works great! No more error code--WAIT...

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