Where is the transmission filter located on a 2001 Dodge Ram 2500 Diesel?

The 2001 Dodge Ram 2500 diesel (likely a Cummins engine) does not have a transmission filter in the traditional sense like an automatic transmission. The Cummins ISB engine uses a spin-on filter for the transmission fluid, but it's *integrated* into the transmission itself and not a separate, easily accessible filter that you'd change independently.

To change the transmission fluid and filter (which is one unit), you'll need to access the transmission's filter housing which is located on the transmission itself. Precise location will vary slightly depending on the specific transmission type (e.g., 47RE, 48RE). You'll likely need to work underneath the truck.

Consult your owner's manual or a repair manual specific to your truck's transmission for precise instructions and location details. Improper filter/fluid changes on a diesel transmission can cause significant problems. If you're not comfortable performing this yourself, have a qualified mechanic handle it.