What 2004 workhorse chassis do I have?

[jcl071441]

I am trying to identify what 2004 workhorse chassis that I have in my 2005 Winnebago adventure 37 B. I need to identify the chassis so that I can then identify the rear and differential in the chassis so that I can run down parts to repair my leaking differential seal. I do not have any information on the chassis
in the paperwork that I receive with the motorhome, I want to purchase the correct part and get it repaired.

[Jim_HiTek]

Have you tried entering your RVs VIN into google and following it? Might be able to find some info that way. That's how I found my chassis' rear axle, by drilling down from the VIN.

[Cataska]

Is there a tag on the differencial