T-90 Transmission Service Diagnosis - M38A1

T-90 Transmission illustration shown for reference only - click here to shop for these parts by interactive diagram

T-90 Transmission

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Slips out of high gear: Possible Solution:
Transmission misaligned with bell housing Align transmission case to bell housing to engine
End play in main drive gear Tighten front retainer
Damaged pilot bearing or front bearing Replace
Slips out of second: Possible Solution:
Worn gear Replace
Weak poppet spring Replace
Noise in low gear: Possible Solution:
Gear teeth worn Replace gears
Shifting shoe bent Replace shoe
Lack of lubrication Drain and refill
Grease leak into bell housing: Possible Solution:
Gasket broken front bearing retainer Replace
Transmission main drive gear oil seal Replace

* Learn more about the T-90 Transmission from the Service Manual for 52-66 M38A1