Mopar Performance extra capacity 727 TF Pan
You can get a pan from a 90's model ram, ram van, jeep, dakota, etc. The 46rh/re transmissions that come in some of those vehicles have a deep sump pan on them. I ordered one from summit but haven't installed it yet. Local parts stores should be able to get them. Dorman #265-827
Some of the lighter duty trucks, vans, and jeeps have a 44rh/re transmission. I believe those pans are deeper and will bolt up to a 904. I haven't tried it, but it looks like it would work. Dorman also sells that pan and can be found for $25 or so online.