Product Details

Master rebuild kit for the RG4R01A or JATCO JR403E automatic transmission

Year range: 1988-1998

Transmission make: Chevrolet, GM, GMC, Isuzu, Nissan UD, and Mitsubishi Fuso, 2-Ton Trucks

Engine: Inline 4 cylinder diesel

Rear wheel drive models with the 4 speed automatic transmission

This high quality transmission master overhaul rebuild kit contains

• All friction clutch plates
• 2-4 brake band
• Fluid filter
• Front pump bushing
• All rubber clutch piston seals
• All paper gaskets
• All O-rings
• All metal clad seals
• Teflon and steel sealing rings
• Duraprene pan gasket

The Transtec gasket overhaul set contained within this box kit is highly rated and used by most rebuild shops.

Additionally, you can add the following options to this rebuild kit:

• Steel clutch plates - (*Pictured)
• Full bushing kit
• Rostra solenoid pack – EPC, Overrun, shift solenoids
• Lockup solenoid
• Transgo shift kit or Superior shift correction kit
• Billet overdrive servo – Sonnax 62170-01K

Remember to soak all of your clutches in transmission fluid for thirty minutes before you install them.

This overhaul kit works in the following Chevrolet, GM, GMC, Isuzu, Mitsubishi Fuso, and Nissan UD applications.

Chevrolet

• W3500 Tiltmaster, I4 diesel, 1988-1998*

GMC

• W3500 Forward, I4 diesel, 1988-1998*
• W4500 Forward, I4 diesel, 1988-1998*

Isuzu

• NPR, I4 diesel, 1988-1998*
• NPR HD, I4 diesel, 1988-1998*

Mitsubishi Fuso

• FE, I4 diesel, 1988-1998*
• FE-HD, I4 diesel, 1988-1998*
• FE-SP, I4 diesel, 1988-1998*
• FG, I4 diesel, 1988-1998*

Nissan UD

• 1200, I4 diesel, 1988-1998*
• 1400, I4 diesel, 1988-1998*

*The JR403E or RG4R01A transmission ended in 1998. However, that year was a cross-over to a different transmission in these applications. If you are unsure about a 1998 model, please contact us for help.

This JATCO transmission is known by multiple names and codes, including: JR403E, RG4R01A, RG4RO1A, and RMK.