shifting issue/wrong atf?

I've been trying to figure this issue out for a while now with no luck. About two weeks ago I was going down the freeway and hit a metal shard and sliced my drivers side front tire and transmission oil pan. So lost all the fluid and had to be towed home. Replaced pan and refilled with dextron 3 like the big green sticker says. Now driving down the road it doesn't slip in any gear. The issue is during the gear shifts it revs up 500 to 1000 then drops and accerates normal. Fluid level is good. Does this warm and cold. I refilled the transmission correctly. Slim not sure if maybe the newer fluid is to blame or something else was hit that would cause this. My car is a 95 525i automatic. Has 220k on motor and body. Transmission has 110k