Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2007SUBURBAN C1500, 5.3 0REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 457 (AUTOMATIC TRANSMISSION - ALLISON (TROUBLESHOOTING))TROUBLESHOOTINGROAD TEST PROCEDUREPART THROTTLE DETENT DOWNSHIFT
2007 Chevrolet Suburban C1500, 5.3 0
Part Throttle Detent Downshift
2007 Chevrolet Suburban C1500, 5.3 0SECTION Part Throttle Detent Downshift
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Place the shift selector in DRIVE.
- Accelerate the vehicle to a speed just above the FOURTH to FIFTH shift point, using less than 50 percent throttle.
- Quickly increase throttle angle to greater than 63 percent.
- Verify the following conditions:
- The TCC releases.
- The transmission downshifts immediately to FOURTH range.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.