Front axle ID 4200

[sleadhed]

I have looked at the fill plug pad. cleaned with brake cleaner, sprayed the rest of the housing.
I swear I had found it once before but I can not find any stamping on the housing, any other place to concentrate other than the fill plug pad??

 

[beenthere]

Have a pic of what you are calling the "fill plug pad" ??

Then I can look at my 4300...