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  1. M

    On a 2019 GMC Yukon xl denali 6.2 10 speed Transmission - Does it sound correct that GM recommends a Drain and Fill and not a "Flush"?

    If the 10L80 is suffering no drivability symptoms, then a drain & refill is reasonable. I'm sure someone knows how to push more ATF out so that more fresh ATF can be put back in vs a simple pan drop. (How many miles? The more miles, the more badly you want a flush.)
  2. M

    Speedometer not reading correctly.

    At what actual MpH is your speedometer off by 10MpH? If it's ALWAYS off by 10MpH, that's the needle's stepper motor, methinks. Even if it's not, your'll likely need to pull the driver info center out of the instrument panel. If it's off by 10MpH at a certain MpH, less under that MpH, more over...
  3. M

    2004 Tahoe Possible 4WD Issue

    One of the many problems with this forum, is that I can choose to 'Like' or 'Love' posts, but I cannot choose to deem them 'Helpful', like I can in, say, the (GM 91-96 B & D car) Impala SS Forum. Your posts are truly Helpful.
  4. M

    2004 Tahoe Possible 4WD Issue

  5. M

    2004 Tahoe Possible 4WD Issue

    OK, I think my mech can figure this out. Don't want to lose 4Hi. (Pressing 4Hi to be in 2Hi, seems redundant, no?) Merely want to gain the OPTION to lose 4Lo / HAVE 2Lo.
  6. M

    2004 Tahoe Possible 4WD Issue

    Are the instructions that simple? As soon as I understand this, I'll have my mech install a switch in the ground wire circuit. Also, if I implement this, and then press 4Hi, what happens?
  7. M

    2004 Tahoe Possible 4WD Issue

    @Fless just saved me 2 Benjamins. Awesome.
  8. M

    E85 or regular gas?

    Did the price of switchgrass go up in Brazil? I know that Brazil makes their ethanol out of switchgrass instead of corn like ours.
  9. M

    Growling in 4 wheel drive

    Stay in 2WD until you get to change the front diff fluid. That's when you'll find out. Don't F around.
  10. M

    P0420

    According to those two pics, there's something wrong with your driver's catalytic converter. To oversimplify, the B1 S2 (and B2 S2) O2 Sensor should nearly always read UNDER 450mV. rockola1971 is right about how the catalytic converter should work.
  11. M

    Do torsion bars wear out?

    @bgiff, by now, hopefully you see that you need to find or provide some kind of data ...
  12. M

    Do torsion bars wear out?

    @Roilux, your front torsion bars are rated @ 4553. Looks like 'your' torsion bars 15051907-LH (6XN) & 15051908-RH (7XN) (Max torque 4553) have been superseded by 15048307-LH (6XK) & 15048308-RH (7XK) (Max torque 4553)
  13. M

    E85 or regular gas?

    Think it depends on local corn prices. For me, e85 is too expensive in NYC, but the price is right in Long Island.
  14. M

    Do torsion bars wear out?

    Unfortunately, they've eluded me as well. Until you or I find a real torsion bar guru, my best guess would be - assuming you're one of those who goes by the strictest definition of GM OE: find an '05 or '06 Premium Smooth Ride Tahoe LT as similar as reasonably possible to yours, use its VIN to...
  15. M

    07+ Brake upgrade on a 00-06 NBS, is it worth it?

    Ever witnessed a 'sporty' car with cheap schidty tires? Long story, short: brakes, steering, and suspension are ALWAYS limited by the tires. What limitations are you willing to pay for?
  16. M

    E85 or regular gas?

    Yes, this is absolutely true, but I was speaking on a much smaller scale. Fuel vapor that makes it past the piston rings into the crankcase, hopefully, get recuperated by the PCV system, although this is the other source of oil burning as well. Catch can only helps by separating oil vapors from...
  17. M

    E85 or regular gas?

    In your case the price maths work.
  18. M

    2001 GMC Yukon XL (Aka Beast)

    2500 & 3500 used rear leaf springs instead of coils. I know they share much in common with 2500 & 3500 pickups, but I don't know enough about their differences.
  19. M

    07+ Brake upgrade on a 00-06 NBS, is it worth it?

    Great brakes + tires not designed to improve maximum panic braking = less-than-great brakes. My braking got slightly worse when I went from a decidedly non-offroad set of tires to a set of offroad-ish tires. Still glad I have 2010 Tahoe PPV front brake kit. No worries about fade during panic...
  20. M

    2001 GMC Yukon XL (Aka Beast)

    Just went and looked up a random 2000 2WD Tahoe. Lo and behold, 15051907 & 15051908 front torsion bars. Did not know that the 2WD GMT800 pickups used front coils instead of torsion bars. Interesting ...
  21. M

    E85 or regular gas?

    Not all the injected fuel is burned. Before some of it escapes during the exhaust pulse, some of it sneaks past the rings during the compression and power strokes. I'm no Lake Speed Jr. Between me and him, there are plenty qualified to explain the details better than I.
  22. M

    E85 or regular gas?

    Ask your motor oil analyst. Once fuel gets into motor oil, it doesn't evaporate as easily as it would out in the open. I'll go so far as to say that I don't know what those numbers mean. What units do those numbers measure? It's as if I said I'm '3.8333'. Most people don't realize that the OTHER...
  23. M

    E85 or regular gas?

    Didn't say it's a problem, it's just a fact. Imagine a (better) world where engine material wear was zero-point-zero. What reasons would there still be left to change the motor oil? The admittedly very small amount of fuel that sneaks past the piston rings does slowly dilute motor oil. As a...
  24. M

    E85 or regular gas?

    @swathdiver, IFF you were to use either gasoline or e85 for an entire oil change duration, do you think you'd be able to lie to your motor oil analyst - say you used e85 when you actually used gasoline, or vice versa - and get away with it? Or do you think your oil analyst would detect the...
  25. M

    E85 or regular gas?

    Although I'm a pessimist, and do not expect to see any of the following, I'll be happy to be proven wrong: *Lifetime comparison of two otherwise identical engines' lives, one operating on pure petrol / E0/G100 gasoline, one operating on E51-E83 but these days the more likely comparison would be...

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