O - other possible causes

I - most probable cause

problem
Causes	Noisy forward speeds		Noisy reverse	Noisy neutral	Hard shifting	Jumps out of gear	Sticks in gear	Gears clash	Two gears locked	leaks
Low or wrong lubricant	O		O	O	O		O	O		O
Transmission loose or misaligned	O		O	O		O
Main drive gear or bearing damage	I		O	O			O	O
Speedometer drive noise	O		O
Main shaft drive or bearing damage	I		O	O		I
Incorrect end play on shafts	O		O	O		O
Reverse idle gear or shaft damage			I	O
Incorrect clutch adjustment				I	O		I	I
Shift linkage misadjustment					I	O	O		I
Bent shifter forks or shafts					O	O	O		I
Damaged synchronizers					O	O	O	I
Speed too high on downshift					I			O
Front main bearing damage	O		O	O		O
Bent output shaft						O
High idle speed								O
Non-synchro gear, shift slower								I
Bent shift rods									O
Overfilled										I
Seals at cover or tail housing bad										O
Loose drive gear bearing retainer										O
Operating shaft seals bad										O
Worn extension housing bushing										O

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