January 01, 2013
4F50N, '04-Later: No Forward or Reverse After Valve Body Replacement
Valve Body Xpress
AX4N Valve Body Identification
Valve Body Xpress
Part Number Chart
| Part Number | Description |
|---|---|
| [F088] | AX4N, '94-'98 |
| F089 (Warranty Only) | AX4N/4F50N, '98-'03 |
| F087 (Warranty Only) | 4F50N, '04-Later |
Identification
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-'98 | AX4N/4F50N, '98-'03 |
|---|---|
| Rough Forging Number: RF F4 | Rough Forging Number: RF F8 or RF XF1 |
 | |
| 4F50N, '04-Later | |
| Casting Number: RF1P | |
 | |
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While Sonnax makes every effort to ensure the accuracy of technical articles at time of publication, we assume no liability for inaccuracies or for information which may become outdated or obsolete over time.