Recent content by Jay

  1. J

    Weird issue with 4x4 selection

    Sounds like the PCM can't tell what position the encoder motor is at. Crawl under there and check the harness on the transfer case. Clean it real good then see what happens. If all else fails, replacing the encoder motor sensor will probably fix the issue. Google search for sierra encoder motor...
  2. J

    Transmission Shifting Problems

    You will have a 4L65E behind the 6.0. Sounds like there are multiple leaks. Could be a damaged separator plate gasket, leaking accumulator piston (builders don't always replace the plastic ones during rebuild! Go with the aluminum pistons next time), o-ring, or the PWM circuit wasn't addressed...
  3. J

    Members knowledgeable about transmissions, step inside...

    At first glance I agree with the solenoid problem. If you have 118k miles without having ever changed the trans fluid and filter, clutch mud might be caking inside the solenoids. Change that fluid and filter 1st. For peace of mind you can also replace the two shift solenoids while you're in...
  4. J

    Stuck

    You have the borg warner 4482 transfer case, which has a planetary type differential in it to constantly deliver power to both axles. The only way to lock it in is to engage low range. Check your fluid first to make sure its good and there's no metal shavings. It could be a bearing on one of...
  5. J

    Trans question

    You will need a PCM tune. It's been evolving through the years so it'll mostly be a model-specific approach. The newest trucks and SUVs are eat up with TM. My 07 Yukon, while more powerful, isn't near as responsive as my old 05 5.3 was. The damned thing just doesn't do what you want it to. If it...
  6. J

    Thinking of getting a full size SUV

    I've had many 5.3s and 6.0s in my fleet trucks go past 300k miles. As of now I have a 2002 1500 with the original and untouched 5.3 that's somewhere around 330-340k miles. It's on the 2nd transmission, original lasted until ~220k miles. It's not unusual for some of my trucks see 40k miles per...
  7. J

    Tranny Slipping??

    First off, describe the slippage. Is it only from a stop, or in certain gears, or all gears and scenarios? WOT, 1/2 throttle, 1/4 throttle? What about at a steady highway speed on level ground? Autozone will pull codes for free... get scanned and post if any. The main culprits for a true slip...
  8. J

    Gear ratio question.....wheel & tire size change

    Tire height acts like a gear. Switching to taller tires is like decreasing the gear ratio in your axles (like from 3.42s to 3.23s). The opposite is true for switching to shorter tires. It affects the total drive ratio , which means all gears are affected. It does not change the total power the...
  9. J

    Thinking of getting a full size SUV

    05-06 are the hallmark of this generation as they were available with all the major features (electric cooling fans, combined sunroof/rear entertainment package, 2nd row captains chairs, rear lift gate, Stabilitrak w/ G80 locker, Autoride suspension, etc). I'm partial to the Yukons due to...
  10. J

    Transmission

    Next time it does it, return to a stop. Put the shifter in "1" and see if it pulls away like normal. If it goes just fine, shift into "2" ~2500-3000rpm and see if all is ok. Then at 2500-3000rpm again, pull the shifter into "3". All you're doing is manually shifting it. If all that goes well...
  11. J

    transmission nightmare

    Status?
  12. J

    Help!!! no overdrive after vette/super servo install.

    Unless superior machined the piston too thin, I don't see any other reason why there's a geometric issue. If the factory 4th piston works fine, then the superior should also. Since the factory piston works fine, my first suggestion would be to send the superior back for a refund and use the...
  13. J

    Help!!! no overdrive after vette/super servo install.

    The piston is supposed to stay inside of the cover at all times... this almost looks like the piston is slightly protruding from the cover when oil pressurizes behind the piston, making the seal tear on the edge of the cover. Make sure the cover ring is fully seated. You have to be careful...
  14. J

    transmission nightmare

    Since this is a rebuilt transmission, we're probably just chasing the rabbit into the hole. The builder needs to figure out what's wrong. The solenoids should have been replaced during rebuild. The trans is connected directly to the PCM via the harness, no individual fuse that I'm aware of...
  15. J

    Tahoe 4WD Howling Noise

    As long as the gears are still good the cost for parts isn't high. You can get a good quality rebuild kit with Timken bearings for under $150. Make sure you get the new locking tabs for the spanner nuts from an 07+ truck (cheap at GM dealer... tell them 07+, don't let them source the old style)...
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