January 01, 2013

AX4N Valve Body Identification

Valve Body Xpress

Part Number Chart

Part NumberDescription
[F088]AX4N, '94-'98
F089 (Warranty Only)AX4N/4F50N, '98-'03
F0874F50N, '04-Later


To identify the correct valve body for your application, look for the first four to five rough forging numbers on the pump body. The numbers will be RF F4, RF F8, or RF XF1. See the black arrows for location of the casting numbers.

The late-model 4F50N will have a square hole in the pump cover. See the red arrow for location.

AX4N, '94-'98AX4N/4F50N, '98-'03
Rough Forging Number: RF F4Rough Forging Number: RF F8 or RF XF1
4F50N, '04-Later
Casting Number: RF1P

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