You said 2004, don’t you have the ZF trans? I thought the 4.4 and 4.8 shares the same trans?? If yours was working good, maybe pull the mech, do a solenoid set, bridge seal and pickup tubes with new filter, fluid and sleeve and roll with it. - would save you a few bucks for sure.

Hmmm, what about sleeving your 4.4 and bumping the bore to 4.8? Not sure the cost but by the time you do DME and find the donor motor.... maybe something to look at?

Just spit balling [emoji106]