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  1. M

    Shifting Issues

    Regardless of whatever GM says, ATF should be changed every 30k. You may want to very seriously consider having your old ATF analyzed, it may give you better more specific answers than blind guesses based on some typed words. Do you 'really feel' the shift? Or do you just notice the 8L90 (or...
  2. M

    Engine swap

    So which is more cost-effective: Lingenfelther's 58x/24x converter, or removing the 58x reluctor and affixing a 24x reluctor?
  3. M

    Chevrolet Suburban 3500 Questions

    @Bigburb3500, if I owned a 3500 with intent to Tow / Haul over 12,000lb, I'd get Tow / Haul mode rewritten as follows: *avoid 6th entirely (... or only allow 6th @ or over a road speed you'd NEVER achieve while towing) *only use 5th with the TCC Locked at the VERY light throttle angles...
  4. M

    Chevrolet Suburban 3500 Questions

    With the slip left in the shifts and the TCC LockUps, the driver may only notice the slight changes in RpMs, but will feel almost nothing at the seat of the pants. Aunt Tique and Aunt Cester might appreciate these barely detectable transitions, but they are a significant cause of cumulative wear...
  5. M

    Chevrolet Suburban 3500 Questions

    Other tuners besides BlackBear SHOULD be able to accomplish the above. *Electronic-signal-throttle vehicles NEVER open or close the throttle as quickly as your foot can - unless you have your ecm tuned. *GM OE transmission shift pattern not only prioritizes economy, it either encourages...
  6. M

    Chevrolet Suburban 3500 Questions

    *It would net more power - not just over 5000RpM, but basically anywhere over 1500RpM, meaning that your MpGs may improve IFF you keep your foot out of it *Your transmission has Normal and Tow / Haul shift maps available; they can be more finely customized to suit your tastes AND improve...
  7. M

    Dealing with Deposits to Boost Engine Life

    Just 'cause I don't smoke enough to get lung cancer (4 cigarettes a day avg), doesn't mean I shouldn't smoke even less than I already do. Just 'cause you haven't yet blown an engine, doesn't mean you can't keep it even cleaner than you already are. Whatever causes two-mode lifters to fail, I...
  8. M

    Real Benefits to 91/93 Octane in a regular LQ4???

    Indeed. ... but a couple MpG helps defray the cost of the tune ... ... so does a TCC or a transmission that lasts longer because line pressures were improved and TCC lockup was addressed ... ... or an engine that lasts longer because Engine Half@$$ or Cylinder Confusion was disabled, or because...
  9. M

    Dealing with Deposits to Boost Engine Life

    Everywhere inside the engine. Howsabout all those lazy / confused cylinders?
  10. M

    Police performance mode

    What are the odds that you have access to the 2006 gm upfitter brochure? Trying to figure out which are the stiffest front torsion bars my Tahoe can reasonably use ...
  11. M

    Another engine cooling fan problem

    GM OE fan turn-on temps - with AC OFF, or with not enough AC pressure - are VERY high. GM OE fan turn-on AC psi thresholds are far more reasonable. What you are missing, is a pcm tune. Among many other things that are even more dramatic and important, getting your pcm tuned includes far more...
  12. M

    Dealing with Deposits to Boost Engine Life

    I've already gone through two motor oil & filter changes @ 3,000 miles each with Valvoline Restore & Protect 5W30. Looking forward to a used motor oil analysis in the near future ...
  13. M

    Real Benefits to 91/93 Octane in a regular LQ4???

    Sounds like what you're saying is: 'even a 'tcm-only' tune will improve MpG regardless of octane used'. And yet the majority of GMT800 & GMT900 owners have not yet bothered to get tuned ... Is it just that the 6.2L definition files have not yet become available? 'cause I would not mind detuning...
  14. M

    Real Benefits to 91/93 Octane in a regular LQ4???

    Your last 4 posts are GM OE tables of two 6.0L V8s, yes? I'm sure a significant portion would be interested in the 6.2L V8 tables, as in, Is the low octane table enough to protect a 6.2L from spark knock on 87? Something like that. I'm more interested in whether or not aftermarket improvements...
  15. M

    6L80E Trans Trouble

    Used to drive a 2012 Yukon XL as a livery driver for six and seven figure people in NYC. Stuck in Manhattan rush hour traffic on a 99F day, hottest ATF temp I've EVER seen was 212F. Typically the reported ATF was between 194F & 203F. Over 203F, it was a VERY HOT DAY. (Acceptable, but cooler...
  16. M

    I cannot believe it!

    I'll make fun of GM's 4.8L any day of the week, and twice on Sunday ... but I prefer an old GMT800 (or even a GMT900) that'll last another 10 years that might take a 6.0L swap later, over a younger more complicated k2xx or t1xx with less life left in it.
  17. M

    6L80E Trans Trouble

    Central Texas? Certainly for now, you REALLY don't need the radiator mounted heat exchanger. It's NOT a cooler, if anything it's an ATF warmer / heater. It effectively shares some engine heat with the ATF. It brings ATF up to operating temp sooner, especially for COLD winters. (If you don't have...
  18. M

    Afm

    Range disable is not a delete - delete is when you physically get rid of all the lazy cylinder bullschidt. Any disable is better than not disabling it, but disabling is not as good as deleting.
  19. M

    Helpful ideas on upgrades to 2000 Z71 after motor replacement?

    4.10 axles front and back pcm tune Bilstein 4600 shocks if you are NOT interested in a lift 2006 electrical fans update 2010 front brakes update front and rear swaybars (still trying to confirm which front torsion bars were used by Tahoe PPVs & SSVs ...)
  20. M

    making the steereing firmer

    A relatively simple supercharger mod is to use a slightly smaller pulley wheel to ramp up the boost sooner. Would a slightly larger pulley installed on the power steering pump reduce the assist?
  21. M

    6.0 what grade fuel

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  22. M

    Real Benefits to 91/93 Octane in a regular LQ4???

    Oh, but I am. 1. GM designed spec'd built and tuned every 4.8L and 5.3L specifically for 87 octane; same goes for the LQ4, and most of GM's other 6.0L V8s. 2. Too many are reticent / averse to having their pcms / ecms & tcms tuned. They fail to appreciate how easy it is to tune an LQ9 or any...
  23. M

    What's my technical tire size 32,33,34??

    Does this look familiar? https://www.angelfire.com/pa5/carclub/tiresize.html If you prefer a comparison: https://www.1010tires.com/Tools/Tire-Size-Calculator3 265/70R17 is your OE tire size, which is 31.61" tall. 265/70R20 is 3 inches taller than that = 34.61" tall.
  24. M

    Beefed up suspension

    My '02 Z71 wears 255/70R18, which are 32" tall. No issues, but it's close enough. Try a better tape measure. 265/70R17 are 31.6" tall, so 265/70R20 MUST BE 34.6" tall. https://www.angelfire.com/pa5/carclub/tiresize.html
  25. M

    Real Benefits to 91/93 Octane in a regular LQ4???

    Pessimistically, 1 gal of gas equals 10 stop'n'go miles. Optimistically, as much as 25 highway. So a 25 gallon tank (never run it bone dry) should cover between 250 and 625 miles. Price of 91 / 93 in NYC is about 30% higher than the price of 87. 250 * 1.3 = 325 miles ... 625 * 1.3 = 812 miles...

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