Noise from transmission in N and P positions/modes

Probable cause(s)

• Forward clutch defective
• Input shaft assembly worn or damaged
• Reverse brake defective
• Reverse brake piston defective
• Thrust needle bearing or thrust shim on input shaft assembly seized, worn, or damaged
• Planetary carrier assembly worn or damaged
• Sun gear worn or damaged
• Ring gear worn or damaged
• Thrust needle bearing or thrust washer on planetary carrier assembly seized, worn, or damaged
• Transmission fluid pump worn, binding, or foreign material in transmission fluid pump

Notes 

• Inspect the clearance between the forward clutch end-plate and the top disc . If the clearance is out of tolerance, replace the input shaft assembly.
• Inspect the input shaft assembly for wear and damage. If the input shaft assembly is worn or damaged, replace it and also check the related part of the input shaft assembly for wear and damage.
• Inspect the reverse brake piston and the O-rings. Check the spring retainer/return spring assembly for wear and damage. Inspect the clearance between the reverse brake end-plate and the top disc . If the clearance is out of tolerance, inspect the reverse brake discs and reverse brake plates for wear and damage. If the discs and plates are worn or damaged, replace them as a set. If they are OK, adjust the clearance with the reverse brake end-plate.
• Check the thrust needle bearing and the thrust shim on the input shaft assembly for seize, wear, and damage. If the thrust needle bearing or the thrust shim are seized, worn, or damaged, replace them and also check the related part of the input shaft assembly for wear and damage.
• Check the planetary carrier assembly for wear and damage. If the planetary carrier assembly is worn or damaged, replace it and also check the planetary carrier pinion gears, the reverse brake, and the drive pulley shaft splines for wear and damage.
• Check the sun gear for wear and damage. If the sun gear is worn or damaged, replace it and also check the planetary carrier pinion gears, the forward clutch, and the drive pulley shaft splines for wear and damage.
• Check the ring gear for wear and damage. If the ring gear is worn or damaged, replace it and also check the planetary carrier assembly and the reverse brake for wear and damage.
• Check the thrust needle bearing and the thrust washer on the planetary carrier assembly for seize, wear, and damage. If the thrust needle bearing or the thrust washer are seized, worn, or damaged, replace them and adjust the clearance with the thrust shim.
• Check the transmission fluid pump for wear and damage. If the transmission fluid pump is worn or damaged, replace it as an assembly .