truck transmission diagnostics
isuzu box truck transmissions Diagnostics for Isuzu NPR, NQR trucks and GM W3500 and W4500 trucks with Jatco JR403 transmission and Aisin 450-43LE transmission

All Isuzu NPR and NQR model trucks as well as GM W3500 and W4500 trucks with diesel engine and the Jatco JR403E Transmission and the Aisin 450-43LE Transmission have the capability of having the trouble codes accessed directly from the truck using the transmission light on the dash in what's called "Dealer Mode". We can help with your Isuzu truck transmission problems. See our Tech tips pages for free diagnostic information.

You must check year of manufacture inside cab to properly id these Transmissions! do not go by year of registration. 1998 is split year for model of unit and diagnosis goes by production years. also watch out for trucks that the cabs have been changed on etc. this can throw you off on proper ID! Any of these trucks with gas 5.7 and 6.0 Chevy engines will have GM 4l80E automatic transmission and requires Tech2 scan tool or equivalent to access codes and diagnostics

Isuzu/Gm trucks used the Jatco JR403 transmission 4 speed automatic from 1988 thru 1998. 1999 and up use the Aisin 450-43LE 4 speed automatic transmission.


Isuzu NPR,NQR and GM W3500/4500 series trucks started using the Aisin A465 transmission in 2006 which is an 6 speed automatic transmission.

Isuzu Truck Transmission Troubleshooting

aisin 450-43le transmission jatco jr403

           Aisin 450-43LE transmission 1998 and up.                                  Jatco JR403 1988 thru 1998

2006-2010 Aisin A465 transmission

1988 thru 1998 diagnostic purchase. (Jatco)

1988 thru 1998 info is complete diagnostics with How to retrieve transmission trouble codes without use of scanner in Isuzu NPR and NQR trucks, wiring, diagnostics steps, repair Info. $10.00 After checkout with pay pal you will be directed to download thru Pay Pal. thank you.
1998 thru 2006 diagnostics purchase. (AW450-43LE)

1998 thru 2006 is Isuzu truck trouble code retrieval without a scan tool and definitions, diagnostics, wiring, no Transmission internal repair Info. $10.00
 here first. After checkout with pay pal you will be directed to download thru Pay Pal. thank you.

 2006 thru 2010 diagnostics purchase. (A465)
  2006 thru 2010 info is complete Transmission diagnostics including how to retrieve A465 Isuzu/GM truck trouble codes without scanner, Isuzu truck transmission wiring diagrams, diagnostics steps, repair Info. $20.00 After checkout with pay pal you will be directed to download thru Pay Pal. thank you.
All information is in PDF download format. if you need  Acrobat Reader reader please click here.

New! AS68RC rebuild and technical manual covers all truck models.
The AS68RC/A465 Transmission rebuilding manual covers Dodge and Sterling Bullet trucks, Mitsubishi Fuso and Isuzu/GM trucks.
This is complete Aisin AS68RC/A465 rebuilding manual with step by step instructions, all specifications such as clutch clearances, end play and torque specs for the Aisin AS68RC also named the A465 transmission. All steps illustrated with color pictures, diagrams and charts as needed for each step. Includes pressure testing, diagnostic code list for Dodge and Sterling trucks. Manual diagnostic code retrieval for Mitsubishi Fuso trucks and Isuzu/GM trucks with code lists. Also includes Initial learn procedure that can be performed without scanner for Mitsubishi and Isuzu/GM trucks.
Cost is $50.00 with $2.50 first class mail postage in United States only. If your outside of the U.S. Please contact us first and we can quote shipping and send you an invoice directly. Please include complete address. This will include one DVD disc containing the AS68RC rebuilding manual in PDF format mailed to your address.

Please visit our Tech Tips page for free information and technical tips as well as free technical help via e-mail with an ASE certified technician.

Both the Jatco JR403E and Aisin 450-43LE transmissions use Dexron ATF oil.

The required fluid for the A456 (Aisin AS68RC transmission) is Exxon JWS3309, or Mobil ATF-3309. Dodge sells as AS68RC fluid. do not use Dexron or Mercon fluids or any other kind of fluid in this transmission or damage will result.


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