A40D Sprag Transmission parts, repair guidelines, problems, manuals

Transmission general data

Number of gears Transmission Type Drive Torque (Nm) ATF (full capacity) L ATF (change) L ATF type
4 AT RWD 230 6,3 4 Toyota T-IV
Related transmission models or modifications of this transmission:
Part type (1) Expand

Technical issues and repair guidelines

Typical issues of the А40 transmission are mainly caused by the the unit's ageing:

- Damaged torque converter lockup clutch. The damage of the lockup frequently causes heavy vibrations, resulting in the seal damage, then leading to issues with the pump liner and the pump itself.

- Worn-out friction components in Direct- Forward and Reverse packs. Old cars usually require replacement of these frictions.

- Rubber elements become hard with time and overheating causes the wear of rings, leading to pressure supply deficiency in packages and burning of friction components.

Overhauls mainly include the transmission reassembly and cleaning procedures accompanied by spare parts replacement – namely, worn-out brake blocks, frictions and gaskets with seals. All friction components are usually replaced during the overhaul of transmissions in cars with high mileage and burnt oil.The second most commonly replaced component in this transmission is the Low reverse clutch. Major repairs of hard parts mainly take place when the pump bushing (and leaking seal) gets damaged by the torque converter lockup clutch.