Gearbox Jatco JR402E

The Jatco JR402E (or RE4R01A or RE4R01B) 4-speed automatic transmission was produced from 1986 to 2013 and was installed in rear- and all-wheel drive models manufactured by Nissan, Ford and Kia. On Mazda vehicles, this transmission is known as the R4A-EL, RA4A-EL, RB4A-EL, on Subaru vehicles, as the 4EAT.

Specifications

Type	automatic transmission
Number of gears	4
Type of drive	rear / all wheel
Engine volume, l	up to 4.5
Torque output, Nm	up to 350
Recommended oil	Nissan Matic Fluid D
Oil capacity, liter	8.4
Replacing the oil	every 50 000 km
Replacing the filter	every 100 000 km
Gearbox lifespan, km	~400 000 km

In 1986, Jatco released a new 4-speed automatic transmission to replace the well-known 4N71B. This automatic transmission was designed for rear- and all-wheel drive vehicles with engines up to 4.5 liters and 350 Nm and was adapted for severe operating conditions: prolonged low-speed driving, slippage, rocking, and towing large and very heavy trailers. In addition to Nissan and Infiniti models, this transmission was also found in Ford, Kia, Isuzu, and Mazda.

Initially, two transmission versions existed: the RL4R01A with hydraulic control and the RE4R01A with electronic control. An updated version, the RE4R01B, was released shortly thereafter. In Mazda vehicles, this automatic transmission is known as the R4A-EL, RA4A-EL, and RB4A-EL, and in Subaru vehicles as the R4AX-EL.

Gear ratios Jatco JR402E

Using the example of a 1998 Nissan Pathfinder with a 3.3 liter engine:

Main	4.636
1st	2.784
2nd	1.544
3rd	1.000
4th	0.694
Reverse	2.272

Using

The transmission was installed on:

• Ford Everest 3 (U704) in 2006 – 2011;
• Ford Ranger 3 in 2000 – 2007;
• Infiniti M30 1 (F31) in 1989 – 1992;
• Infiniti J30 1 (Y32) in 1992 – 1997;
• Infiniti QX4 1 (R50) in 1996 – 2002;
• Isuzu Faster 3 (TF) in 1996 – 2002;
• Kia Bongo 3 in 2005 – 2011;
• Kia Sportage 1 (JA) in 1998 – 2002;
• Mazda 929 IV (HD) in 1991 – 1996;
• Mazda B-series IV (UF) in 1990 – 1993;
• Mazda MPV I (LV) in 1988 – 1999;
• Mazda RX-7 III (FD) in 1992 – 2002;
• Nissan 240SX 1 (S13) in 1989 – 1994;
• Nissan 240SX 2 (S14) in 1994 – 1998;
• Nissan 300ZX 4 (Z32) in 1989 – 1997;
• Nissan Cima 3 (Y33) in 1996 – 2001;
• Nissan Hardbody 1 (D21) in 1990 – 1997;
• Nissan Frontier 1 (D22) in 1997 – 2004;
• Nissan Gloria 8 (Y31) in 1987 – 1991;
• Nissan Gloria 9 (Y32) in 1991 – 1995;
• Nissan Pathfinder 1 (WD21) in 1987 – 1995;
• Nissan Pathfinder 2 (R50) in 1995 – 2004;
• Nissan Skyline 8 (R32) in 1989 – 1994;
• Nissan Skyline 9 (R33) in 1993 – 1998;
• Nissan Skyline 10 (R34) in 1998 – 2002;
• Nissan Stagea 1 (WC34) in 1996 – 2001;
• Nissan Terrano 2 (R20) in 1993 – 2006;
• Nissan Xterra 1 (WD22) in 1999 – 2004;
• Subaru Alcyone 1 (XT) in 1987 – 1991;
• Subaru Alcyone 2 (CX) in 1991 – 1996;
• Subaru Baja 1 (BT) in 2002 – 2006;
• Subaru Exiga 1 (YA) in 2008 – 2010;
• Subaru Forester 1 (SF) in 1997 – 2002;
• Subaru Forester 2 (SG) in 2002 – 2008;
• Subaru Forester 3 (SH) in 2007 – 2013;
• Subaru Impreza 1 (GC) in 1992 – 2000;
• Subaru Impreza 2 (GD) in 2000 – 2007;
• Subaru Impreza 3 (GE) in 2007 – 2011;
• Subaru Legacy 1 (BC) in 1989 – 1994;
• Subaru Legacy 2 (BD) in 1993 – 1999;
• Subaru Legacy 3 (BE) in 1998 – 2004;
• Subaru Legacy 4 (BL) in 2003 – 2009;
• Subaru Outback 1 (BG) in 1994 – 1999;
• Subaru Outback 2 (BH) in 1999 – 2004;
• Subaru Outback 3 (BP) in 2003 – 2009.

Disadvantages of the Jatco JR402E gearbox

• This is a very reliable and durable transmission, and many owners know this well and neglect its maintenance. Therefore, it usually arrives for repairs in such poor condition that it would be easier and cheaper to buy a used automatic transmission.
• The lion’s share of service calls for these automatic transmissions are related to electrical failures. Most failures here involve the throttle position sensor (TPS) or solenoid coils. Corroded wiring is also often the cause.
• A drop in solenoids’ performance results in reduced oil pressure, which in turn leads to worn bushings in the transmission and severe vibrations. If you ignore this, the list of parts that need to be replaced will gradually grow.
• When overhauling a transmission, in addition to consumables, the Overdrive brake band, the High Clutch steel and friction discs, and, less frequently, the planetary gears are often replaced.