New daily driver

No, the 46RH (which my 1995 Dak has now, and yours may) is based on the 727. If your engine is relatively mild, a stock rebuild should work. ANY highway driving without OD will be utter misery unless you swap to 3.23 or taller gears. (Most Daks have 3.55's, mine has 3.90's.)

My dak has 3.5 rear gears. The trans pan looks like the 904. No dog leg on side of pan. Would that be the 518 trans?