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tjg79

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  • Location
    Virginia
  • Drives
    2001 GMC Yukon XL 2500 4wd

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  1. Thanks for the reply. I like the adjustable shocks. Those Rancho RS 9000s might be a good alternative to the stock GM shocks.
  2. I'm considering replacing my shocks on my 2001 GMC Yukon XL 2500 4wd. There are a lot of choices. Does any have experience with a particular aftermarket brand that outperforms the genuine GM replacement? My truck is driven primarily on the highway. I'm looking for the best ride with the torsion bar front suspension, and leaf spring rear. Regards
  3. Should I replace the torsion bars and leaf springs due to the truck's age to bring it back to original spec? I only have about half the adjustment left on the driver's side torsion bar as I do on the passenger's side. Also, a half inch spacer only on the driver's side rear leaf spring seems like I'm polishing a turd.
  4. The weight of a US gallon of unleaded gasoline is closer to 6.25 lbs. That equates to a fuel load of about 241 lbs.
  5. My owner's manual indicates my fuel tank capacity is 38.5 US gallons. Google says a gallon of unleaded gasoline weighs about 6 lbs. Therefore, my fuel capacity is 231 lbs. If I burn-off 3/4 of my fuel capacity, that would only reduce fuel weight by 173 lbs. That fuel weight is not just carried by the left side suspension. It's carried by both sides in proportion to the fuel load moment. Based on that analysis, I don't think the fuel weight is causing all the rear suspension left and right height difference.
  6. Yes, I've been keeping my fuel tanks full. I always top off at 3/4 tank, because I don't want to have to replace the two fuel pumps again after water condensation in the tanks corroded the pumps. I should allow the fuel level to drop to 1/4 tank and recheck the rear wheel opening heights.
  7. Well, I would think a 1/2" height shim plate on the left rear leaf spring suspension would resolve the rear left-right suspension height discrepancy, but I only see degree shims. I need to research this issue to determine if shims are available to just raise the left rear 1/2".
  8. Hello Forum, My left side suspension height was low on my 2001 GMC Yukon XL 2500 4wd. It's stock, and the truck only has 36k miles. I raised the left front to match the right front via the torsion bar adjustment bolt. The height is now 36-1/8" to the left and right wheel openings. I checked the rear and it's 38-1/8" on the right rear, and 37-5/8" on the left rear. Is there a way to adjust the left rear leaf spring suspension height to match the right rear height? Short of replacing the leaf springs, I don't see an adjustment.
  9. Yes, it appears to be a faulty parking brake switch. It's a one wire switch. I disconnected the wire, and all the problems went away. The vehicle systems thought the parking brake wasn't released, hence the chime when moving. The parking brake electrical system is connected to the Automatic Headlamp System. The switch is an easily replaced part, and only costs a few dollars.
  10. On my 2001 GMC Yukon XL 2500 6.0L 4wd I'm getting a flashing brake system warning light and the chime activates when the vehicle is moving. Also, the Automatic Headlamp System appears to be disabled. I suspect a faulty parking brake light switch. I was having an issue with the parking brake warning light not going out after releasing the parking brake about six weeks ago. The solution then was to reapply the parking brake and then release one or two times. That solution is not working now, and the Automatic Headlamp System, which has a connection to the parking brake, is not working or disabled. To turn on the headlamps, I've got to use the manual switch. The problem must be in the parking brake light system. I'm not certain if it's just a switch or a relay and/or fuse somewhere. The brake fluid level is midway between the max and min level marks. The ABS warning light is not an issue here. Does anyone have experience with this problem, and know the solution or troubleshooting procedure to fix this problem? Regards
  11. Thanks for that info on the Russell brake hoses. I'll avoid them. I was looking at the Powerstop brake kits until I saw they are made in China.
  12. I'm looking to replace my entire brake system from the rubber hoses to the wheels. I've been shopping on rockauto. There's a lot of options. Does anyone have recomendations as to brand and aftermarket upgrades?
  13. Tow/Haul Switch/Indicator Always On or Inoperative 4L60/4L60-E/4L65-E Transmission Circuit Description Tow/haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern. Diagnostic Aids If the electrical circuit tests are OK and the tow/haul shift pattern is not occurring, there may be a mechanical/hydraulic condition that prevents tow/haul operation. Refer to Symptoms - Automatic Transmission. Test Description The numbers below refer to the step numbers on the diagnostic table. 2. This step tests for a faulty tow/haul switch. 3. This step tests for voltage input from the BCM to the tow/haul switch. 6. This step tests for voltage through the body wiring harness junction block. 7. This step tests for ground integrity at the splice pack. <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> 4L80-E/4L85-E Transmission Circuit Description Tow/haul mode enables the operator to achieve enhanced shift performance when towing or hauling load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern. Diagnostic Aids If the electrical circuit checks are OK and the tow/haul shift pattern is not occurring, there may be a mechanical/hydraulic condition that prevents tow/haul operation. Refer to Symptoms - Automatic Transmission. Test Description The numbers below refer to the step numbers on the diagnostic table. 2. This step tests for a faulty tow/haul switch. 3. This step tests for voltage input from the BCM to the tow/haul switch. 6. This step tests for voltage through the body wiring harness junction block. 7. This step tests for ground integrity at the splice pack.
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