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MANUAL TRANSMISSION MANUAL TRANSMISSION TROUBLE SHOOTING MANUAL TRANSMISSION/TRANSAXLE TROUBLE SHOOTING CONDITION & POSSIBLE CAUSE CORRECTION Excessive Noise Loose pump-to-drive assembly screws Tighten screws Loose tube on pump assembly Tighten tube Valves not functioning properly Replace valves Oil Leakage Loose end plug Tighten end plug Bad seal crimp Remove and re-crimp seal NOTE: This is GENERAL information. This article is not intended to be Condition Possible Cause Noisy In Forward Gears Low gear oil level, Loose bell housing bolts, Worn bearings or gears Clunk On Deceleration (FWD Only) Loose engine mounts, Worn inboard CV joints, Worn differential pinion shaft, Side gear hub counterbore in case worn oversize Gear Clash When Shifting Forward Gears Clutch Out Of Adjustment, Shift linkage damaged or out of adjustment, Gears or synchronizers damaged, Low gear oil level Transmission Noisy When Moving (RWD Worn rear outputshaft bearing Gear Rattle Worn bearings, Wrong gear oil, Low gear oil, Worn gears Steady Ticking At Idle (Increases With Broken tooth on gear
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
POWERTRAIN CLUTCH TROUBLE SHOOTING BASIC CLUTCH TROUBLE SHOOTING CHART Gear Clash When Shifting Forward Gears Worn or broken synchronizers Loud Whine In Reverse Normal condition (1) Noise When Stepping On Clutch Bad release bearing, Worn pilot bearing Ticking Or Screeching As Clutch Is Engaged Faulty release bearing, Uneven pressure plate fingers Click Or Snap When Clutch Is Engaged Worn clutch fork, Worn or broken front bearing retainer Transmission Shifts Hard Clutch not releasing, Shift mechanism binding, Clutch installed backwards Will Not Shift Into One Gear, Shifts Into All Bent shift fork, Worn detent balls Locked Into Gear, Cannot Shift Clutch adjustment, Worn detent balls Transmission Jumps Out Of Gear Pilot bearing worn, Bent shift fork, Worn gear teeth or face, Excessive gear train end play, Worn synchronizers, Missing detent ball spring, Shift mechanism worn or out of adjustment, Engine or transmission mount bolts loose or out of adjustment, Transmission not aligned Shift Lever Rattle Worn shift lever or detents, Worn shift forks, Worn synchronizers sleeve Shift Lever Hops Under Acceleration Worn engine or transmission mounts (1) Most units use spur cut gears in reverse and are noisy NOTE: This is GENERAL information. This article is not intended to be CONDITION & POSSIBLE CAUSE CORRECTION
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Chattering or Grabbing Incorrect clutch adjustment Adjust clutch Oil, grease or glaze on facings Disassemble and clean or replace Loose "U" joint flange See DRIVE AXLES article Worn input shaft spline Replace input shaft Binding pressure plate Replace pressure plate Binding release lever See CLUTCH article Binding clutch disc hub Replace clutch disc Unequal pressure plate contact Replace worn/misaligned components Loose/bent clutch disc Replace clutch disc Incorrect transmission alignment Realign transmission Worn pressure plate, disc or flywheel Replace damaged components Broken or weak pressure springs Replace pressure plate Sticking clutch pedal Lubricate clutch pedal & linkage Incorrect clutch disc facing Replace clutch disc Engine loose in chassis Tighten all mounting bolts Failure to Release Oil or grease on clutch facings Clean or replace clutch clutch disc Incorrect release lever or pedal adjustment See CLUTCH article Worn or broken clutch facings Replace clutch disc Bent clutch disc or pressure plate Replace damaged components Clutch disc hub binding on input shaft Clean or replace clutch disc and/or input shaft Binding pilot bearing Replace pilot bearing Sticking release bearing sleeve Replace release bearing and/or sleeve Binding clutch cable See CLUTCH article Defective clutch master Replace master cylinder Defective clutch slave Replace slave cylinder Air in hydraulic system Bleed hydraulic system
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Rattling Weak or broken release lever spring Replace spring and check alignment Damaged pressure plate Replace pressure plate Broken clutch return spring Replace return spring Worn splines on clutch disc or input shaft Replace clutch disc and/or input shaft Worn clutch release bearing Replace release bearing Dry or worn pilot bearing Lubricate or replace pilot bearing Unequal release lever contact Align or replace release lever Incorrect pedal free play Adjust free play Warped or damaged clutch disc Replace damaged components Slipping Pressure springs worn or Release pressure plate Oily, greasy or worn facings Clean or replace clutch disc Incorrect clutch alignment Realign clutch assembly Warped clutch disc or pressure plate Replace damaged components Binding release levers or clutch pedal Lubricate and/or replace release components Squeaking Worn or damaged release Replace release bearing Dry or worn pilot or release bearing Lubricate or replace assembly Pilot bearing turning in crankshaft Replace pilot bearing and/or crankshaft Worn input shaft bearing Replace bearing and seal Incorrect transmission alignment Realign transmission Dry release fork between pivot Lubricate release fork and pivot Heavy and/or Stiff Pedal Sticking release bearing sleeve Replace release bearing and/or sleeve Dry or binding clutch pedal hub Lubricate and align
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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