Oil pump drive helical gear kit FORD 10R60 10R80 General Motors 10L80 10L90 [drive gear 49 teeth, idler gear 38 teeth]

Oil pump drive gear:

• Outer diameter - 99.30 mm;
• Inner diameter - 70.25 mm;
• Number of teeth - 49 pcs;
• Gear width - 7 mm;

2. Intermediate gear:

• Outer diameter - 80 mm;
• Gear thickness - 6.75 mm;
• Number of teeth - 38 pcs;
• Bearing marking - NSK 6805A6;
• Bearing inner diameter - 25.05 mm;

The most common problem with the oil pump drive gears of the FORD 10R80 transmission and the similarly designed GM 10L90 transmission is transmission noise from the torque converter. But according to the assurances of the manufacturers themselves, the noise is associated with the design of the gear teeth, namely the rectilinear arrangement of the teeth. This tooth design is less durable compared to helical gears, since the contact patch in gears with a linear arrangement of teeth is smaller, which in turn affects strength.
There are cases when the teeth on the drive gear are damaged, which ultimately entails the complete destruction of the gear. This problem is more common on transmissions installed on vehicles with diesel engines than on gasoline versions.

After working on the mistakes, the manufacturer changed the type of gear from linear to helical.
Helical tooth gears have a larger contact patch, which allows them to withstand greater loads with fewer teeth.
This design is more reliable than linear gears.