Possible Cause
Clutch not releasing
Improper or low transmission lubricant
Shifter shaft or shift rail binding
Binding of sliding synchronizers or gears
If reverse only, seized backup switch
Worn or damaged flywheel pilot bushing Bell housing misaligned

Remedy
Adjust or replace clutch
Add or drain and replace with proper lubricant
Remove extension or adapter and case cover. Check for damaged parts. Replace damaged parts
Remove extension or adapter and case cover. Reach down into transmission and check that synchronizers and gears (parts with shifting grooves) slide freely on shafts. Remove and replace damaged parts
Remove and check backup switch. Replace if seized
Replace pilot bushing
Align bell housing to within 0.010 inch TIR on face and in bore

Possible Cause
Engine idle speed too high
Clutch damaged or out of adjustment
Pilot bearing between input shaft and Output shaft binding
Damaged synchronizer
Bell housing misaligned
Damaged gear or gears
Worn or damaged flywheel pilot bushing

Remedy
Adjust idle speed to specifications
Adjust or replace clutch
Disassemble and check bearing rollers, input shaft ID and output shaft OD. Replace damaged parts
Disassemble and check for damaged synchronizer parts. Replace damaged parts
Align bell housing to within 0.010 inch TIR on face and in bore
Disassemble and check for gear damage Replace damaged gears
Replace pilot bushing

Possible Cause
Loose transmission or flywheel housing bolts, improper alignment
Synchronizer damaged or excessively worn
Blocking ring damaged, worn index slots or friction surfaces worn or damaged
Excessive countershaft endplay
Shifting fork loose on shaft or rail; worn or damaged fork or inserts

Remedy
Torque bolts to specifications. Realign if necessary
Disassemble and check for worn or damaged synchronizer parts. Replace damaged parts
Disassemble and check blocking ring for wear or damage Replace worn or damaged parts
Disassemble and check. Replace worn or damaged parts. Re-shim if roller bearings used
Disassemble and check for wear or damage. Replace worn or damaged parts

Possible Cause
Fork or offset lever loose on shaft or rail
Worn or damaged forks, offset lever, shaft or rail
Worn or damaged synchronizer
Worn or damaged gears

Remedy
Remove extension or adapter and case cover. Check for loose parts on shifter shaft or rail. Replace roll pin(s). If still loose, replace shaft or rail and/or attached parts as required
Remove extension or adapter and case cover. Check for wear or damage Replace damaged parts
Disassemble and check for worn or damaged synchronizer parts. Replace worn or damaged parts
Disassemble and check for worn or damaged gears. Replace worn or damaged gears

Possible Cause
Improper or low transmission lubricant
Loose bolts or other attaching parts
Improper flywheel housing to engine crankshaft alignment
Noisy transmission bearings
Noisy gears

Remedy
Add or drain and replace with proper lubricant
Make sure all attaching parts are torqued to specifications
Check alignment and correct if neces­sary per vehicle service manual
Disassemble and check bearings, bear­ing rollers and parts in and on which they operate for wear or damage. Replace worn or damaged parts
Disassemble and check for worn or damaged gears (including speedometer gear). Replace worn or damaged gears

Possible Cause
Leakage from other components
Vent or breather clogged
Too much or improper lubricant
Loose bolts at sealing faces. Improperly applied sealant
Worn or damaged oil seal

Remedy
Verify transmission leakage. Thoroughly clean all exposed surfaces, then check for leaks.
Remove vent or breather and clean or replace
Remove fill plug to check for excess, or drain and replace
Torque bolts to specifications
Separate and thoroughly clean leaking surfaces. Reapply sealant. Replace parts and torque bolts to specifications
Replace oil seal

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