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  1. R

    03 Yukon - reduced engine power issue

    Well, as you have commented in a previous post, it could be a bad battery, bad alternator, bad grounds. After charging battery, drive to an auto parts store or auto repair facility and have the charging system checked. Discharged batteries most often are caused by the causes you mentioned.
  2. R

    What transmission?

    Just an additional piece of useless information, the older lockup clutches were locked using a 12 volt relay(either on or off). As time moved on, many transmissions now use a "softer" voltage to lock, depending on PCM or TCM control programming. This makes the lockup less of a jolt, but a more...
  3. R

    QTP CUTOUT FOR MY TRUCK

    I've bought QTP cutout kits from SummitRacing.com I haven't had any problem with the 2-1/2" and 3" I think they come with switches. Summit has very helpful folks to talk to as well, unlike some of the Ebay vendors.
  4. R

    2004 Z71 Tahoe NP 246 Transfer Case Swap Question

    I can't comment on your dilemma, but if you do keep this replacement case, I hope you modify it to fix the pump rub problem. The clip that GM uses to act as a thrust washer in both 1/2 and 3/4 ton vehicles eventually will fail. The oil pump constantly spins when driving in both 2WD and 4WD. The...
  5. R

    Preparing to replace 4L60e myself.

    The bottom line is there may be some weird shifts after a transmission changeout, but the PCM will automatically adapt over a very short period of time without any intervention. If you are worried, you could drive it to a dealer to get the PCM "adjusted". By the time you get there, the PCM will...
  6. R

    Denali XL towing

    For the sake of discussion, lets say that somehow you don't completely burn out the tranny clutches doing this and you don't ruin your disc brakes and you don't decrease the life of your engine...have you considered the financial hit if you get in an accident with that overloaded vehicle with...
  7. R

    MN8 : 4-speed HD Automatic Transmission- 4L85E Running Temps

    100* above ambient temperature is very common. Tranny and fluid is fine up to 220-230*. The fluid flowing through the radiator from the tranny dumps excess heat, but will stay pretty close to that 100+ambient after warmup. Wheel bearings, differentials when not towing run about 50* above ambient...
  8. R

    Transmission slipping 2016 Denali

    They are giving you a story. Go to a different dealer or an independent transmission shop and pay for the independent shop to examine it. Contact General Motors directly and ask that they direct the dealer to repair the vehicle. Do not accept this obvious lie. On another note, I have two GM...
  9. R

    Denali and AWD Traction Control. Seems to work more than I would like to..

    I can see where both of these TSB's are logical in certain situations. A dirty surface at the sensor location would only be a problem if the sensors had been r & r'd without cleaning that surface. So it does make sense to check the sensor voltage as recommended. Rough roads causing intermittent...
  10. R

    Trans lagging but "Haul" seems to fix it...

    You could have the truck checked for transmission related codes. If a filter/fluid change doesn't fix it, you could have valve body problems or low pump pressure or...If there is a lot of contamination of fluid, that clutch material gets left in a lot of different places in the tranny and torque...
  11. R

    How much is too much metal shavings?

    The pic's do make you wonder if the housing was thoroughly cleaned before reassembly. The shavings could be left over. I wonder if the gear lash is too tight.
  12. R

    I think I hurt my Transmission (4L60E)

    Clutches? Check your fluid for a burnt smell, dark in color. The weight of a Tahoe places a lot of force on a transmission that has little extra capacity even when new.
  13. R

    Denali and AWD Traction Control. Seems to work more than I would like to..

    I agree with the above posters who think you have a sensor or cable connection that has an intermittent connection that is affected by the rough road. Look for corrosion on the cable connectors. A sensor may have come loose inside of it's plastic case or in the hub. Jack your truck up and...
  14. R

    Coolant smell

    Aluminum heads can have small cracks in them over time. Steam ports weeping on the back side of the engine where they are not visible.
  15. R

    Coolant smell

    If you have the optional rear heat, there is a set of tee fittings in the heater hoses above the motor at the firewall. For some reason GM decided that o-rings were a good way to make that connection. (Not!) I bet that there are a lot of high mileage trucks with this option that leak (the leak...
  16. R

    Which diff to buy?

    The trueurac is certainly a quality unit based on the Torsen design. There are many vehicles (Subaru, etc) that use Torsen style differentials. I doubt you can wear it out.
  17. R

    No codes, power loss

    Matt, thank you for your service overseas. I hope you stay safe and return to your family soon!
  18. R

    Humming sound coming from the rear end

    That is likely differential gears getting worn. When gears are loaded, they are in better contact with each other which cancels out the noise. When you are coasting, the slight howling noise you hear is a type of harmonic vibration transmitted through the frame and body. If you replace the...
  19. R

    Transmission swap

    The valve body may not be original. Or the transmission may have been modified in other ways to increase control pressure.
  20. R

    Anyone running no cats?

    I don't think you will see a check engine light. I do not believe there is any sensor in the exhaust after the cat. When doing the exhaust, you do need to reinstall the O2 sensors to avoid any stored codes and a light. I assume that you don't live in an area that requires emissions testing...
  21. R

    Nylon coated AC Delco brake lines

    I second the stainless brake tubing.
  22. R

    Oil on spark plug cover and misfire

    Check compression. You may have oil burning on that plug. The sparking of the plug and combustion leaves the carbon deposit on the plug. It could be from worn rings in that cylinder. Or, it could be an injector leaking excess fuel into the cylinder. Swap injectors and put a new plug in that...
  23. R

    Help with leak please

    Drain out that excess oil before starting the engine again. The pressure built up by excess oil can cause damage, but you may get lucky. Only time will tell-you will get a little messy from trying to put the plug back in after draining out a quart. Over-filling can create immense pressure and...
  24. R

    Body Control Module "BCM"

    The BCM does not often fail. I would follow the wiring and look for corroded/loose connections before replacing the module. Check the connections on the module itself as well. check all known grounds. How old is your battery?
  25. R

    So... what type of gas mileage do each of the engines get?

    My 2005 LTZ with the 5.3 gets almost 15 in town, 16-17 freeway, depending on speed.

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