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NOISE IN FIRST, SECOND, THIRD, FOURTH, FIFTH, OR REVERSE GEAR NOISE IN FIRST, SECOND, SIXTH, OR REVERSE GEAR NOISE IN SECOND OR SIXTH GEAR Inspect for damaged low and reverse clutch piston Inspect for damaged low clutch sprag assembly (467). Inspect for cut, worn, or damaged low clutch sprag Output Carrier Assembly (68) Inspect for damaged or stripped splines on the output Checks Causes Input Carrier Assembly (52) Inspect thrust washers, pinion gears, and pins for wear or Input Sun Gear (53) Inspect for damaged sun gear. 1-2-3-4 and 3-5-R Clutch Inspect for worn or damaged clutch bearing (428). Checks Causes Center Support with 2-6 Low Inspect for worn or damaged output carrier outer sun gear Output Carrier Assembly (68) Inspect for a worn or damaged center support roller Checks Causes Center Support with 2-6 Low Inspect for damaged or worn output carrier outer sun Inspect for damaged or worn output carrier outer sun
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
NOISE DURING 3-4 OR 4-3 SHIFTS NOISE IN FOURTH, FIFTH, OR SIXTH GEAR CLUTCH PLATE DIAGNOSIS COMPOSITION PLATES Dry the plates and inspect the plates for the following conditions: Pitting Flaking gear shaft rear bushing (460). Inspect for damaged 2-6 clutch backing plate (451). Inspect for damaged 2-6 clutch backing plate Inspect for damaged 2-6 clutch piston assembly Checks Causes 4-5-6 Clutch (with Output Inspect hub assembly (475), dampener (476), and Inspect for damaged or worn 4-5-6 clutch backing Checks Causes Input Sun Gear Thrust Washer Inspect for wear or damage. Turbine Shaft Thrust Bearing Inspect for wear or damage. 4-5-6 Clutch (with Output Inspect for damaged or worn 4-5-6 clutch backing Inspect for improper selective 4-5-6 clutch backing
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Delamination-splitting or separation of bonded clutch material Wear Glazing Cracking Charring Chips or metal particles embedded in the lining Replace a composition plate which shows any of these conditions. STEEL PLATES Wipe the plates dry and check the plates for heat discoloration. If the surfaces are smooth, even if CAUSES OF BURNED CLUTCH PLATES The following conditions can result in a burned clutch plate: Incorrect usage of clutch or apply plates Engine coolant or water in the transmission fluid A cracked clutch piston Damaged or missing seals Low line pressure Valve body conditions The valve body face is not flat. Porosity is between channels. The valve bushing clips are improperly installed. The checkballs are misplaced. The Teflon® seal rings are worn or damaged. ENGINE COOLANT/WATER IN TRANSMISSION NOTE: The antifreeze or water will deteriorate the seals, gaskets and the
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If antifreeze or water has entered the transmission, perform the following: 1. Disassemble the transmission. 2. Replace all of the rubber type seals. The coolant will attack the seal material which will cause leakage. 3. Replace the composition-faced clutch plate assemblies. The facing material may separate from the steel center portion. 4. Replace all of the nylon parts - washers. 5. Replace the torque converter. 6. Thoroughly clean and rebuild the transmission, using new gaskets and oil filter. 7. Flush the cooler lines after the transmission cooler has been properly repaired or replaced. FLUID LEAK DIAGNOSIS GENERAL METHOD 1. Verify that the leak is transmission fluid. 2. Thoroughly clean the suspected leak area. 3. Operate the vehicle for 24 km (15 mi), or until normal operating temperatures are reached. 4. Park the vehicle over clean paper or cardboard. 5. Shut OFF the engine. 6. Look for fluid spots on the paper. 7. Make the necessary repairs. POWDER METHOD 1. Thoroughly clean the suspected leak area with solvent. 2. Apply an aerosol type powder, such as foot powder, to the suspected leak area. 3. Operate the vehicle for 24 km (15 mi), or until normal operating temperatures are reached. 4. Shut OFF the engine. 5. Inspect the suspected leak area. 6. Trace the leak path through the powder in order to find the source of the leak. 7. Make the necessary repairs. DYE AND BLACK LIGHT METHOD A fluid dye and black light kit is available from various tool manufacturers.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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