Mazda R4A-EL

Transmission general data

The 4-speed automatic transmission RE4R01A\B (medium-duty class) RL4R01A (JR402A) found application in RWD and 4WD vehicles (Pathfinder, PickUp X-Terra) with engine capacity from 2 up to 4.5 liters. This gearbox rarely fails and traditionally is considered to be an “invincible” RWD transmission. The RE4R01A\B transmission was produced by Jatco-Nissan in 1987. The design of this transmission was updated several times and as a result it got an electronic control unit (and letter Е in its name instead of hydraulic "L" - RL4R01A). All these modifications have the same structural design and differ in only in some spare parts.

Technical issues and repair guidelines

The overhaul of this transmission is commonly performed after running 250-400 thousand kilometers. Well-timed and correct reassembly of this system adds a significant resource to the whole unit. In the course of reassembly, it is required to clean the valve body and fix the worn-out torque converter. Another measure is to check and replace spare parts - gaskets, rings, friction components.The package High typically is the first to get burnt. The kit of gaskets and seals (Overhaul kit) is a common order for the overhaul procedure.

Each repair of the "old" RE4R01A involves replacement of the following components:

- Brake band Overdrive 37 mm (Low-Reverse)

- Set of 4 solenoids (together with replacement of the torque converter spare parts).

The first hard part to exhaust its solid resource is the assembled planetary gear (Rear-Front) and burning High package. Worn solenoids cause insufficient oil pressure almost unnoticeable while driving, but results in wearout of all bushings and burning of friction components.