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1. Attach a sling to the transmission. 2. Attach a hoist to the sling. 3. Put moderate lift tension on the hoist. 4. Disconnect and remove the transmission from the repair stand. 5. Place the transmission on the work table with the oil pan facing down. Fig. 514: PTO Cover, Bolts & Gasket help when lifting the transmission. Assistance from a
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
6. Install the power take-off (PTO) cover gaskets (1) 7. Install 2 PTO covers (2). 8. Install 12 PTO cover bolts (3). Tighten: Tighten the bolts to 43 N.m (31 lb ft). DESCRIPTION & OPERATION TRANSMISSION GENERAL INFORMATION When attempting to diagnose a suspected 1000 Series transmission problem, always begin by You must be familiar with some basic electronics in order to use this section of the manual. You A Digital Multimeter (DMM) A circuit tester Jumper wires or leads A line pressure gauge set The functional test procedures verify the correct operation of electronic components in the NOTE: Refer to Fastener Notice . IMPORTANT: DO NOT, under any circumstances, attempt to diagnose a powertrain condition without basic knowledge of this powertrain. IMPORTANT: If you probe a wire with a sharp instrument and do not properly seal the wire afterward, the wire corrodes and an open circuit
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Diagnostic test probes are now available that allow you to probe individual wires without leaving DEFINITIONS AND ABBREVIATIONS Throttle Position Definitions Heavy Throttle Approximately 75% of accelerator pedal travel Light Throttle Approximately 25% of accelerator pedal travel Medium Throttle Approximately 50% of accelerator pedal travel Wide-Open Throttle (WOT) Full travel of the accelerator pedal, 100% throttle Closed Throttle Foot is off the accelerator pedal or pedal is not depressed, 0% throttle Throttle-Related Shift Condition Definitions Closed Throttle Manual Downshift A condition where the engine is used to slow the vehicle by manually downshifting during a Closed Throttle Coast Down A full release of the accelerator pedal while the transmission remains in DRIVE range, results.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
WOT Detent Downshift Quick apply of the accelerator pedal to its full travel, forcing a downshift WOT Upshifts/Downshifts Accelerator pedal is fully depressed and transmission shifts sequentially through ranges as Shift Condition Definitions Bump A sudden and forceful apply of a clutch Delayed A shift was expected but did not occur for several seconds, as during a manual downshift or Double Bump Two bumps felt during a clutch apply Early Shift occurs at lower speed than expected, often accompanied by engine laboring after an End Bump A firmer feel at the end of a shift than at the start of a shift Firm A noticeably quick apply of a clutch at medium or heavy throttle conditions - DO NOT Flare A quick increase in engine speed along with a momentary loss of torque during a shift
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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