Transmission

[[ion] C2]

My transmission has always appeared "rock solid" to me, in the essence that it shifts fast and hard on the upshifts, no issues launching etc., but more recently (year or so ago) I really started to notice how it has a huge delay in engaging when it downshifts in the higher RPMs.. (cruising at 45 then punch it, or on the highway if I give it throttle and it downshifts, doesn't even have to be full throttle, just enough to drop it down will make a noticeable slip) Seems like it takes a bit before it actually starts moving faster. I always shrugged it off as the nature of an auto but really, it's slipping a bit too much. It doesn't seem like it can transfer the power to the wheels well. It's always seemed like it lacks power in the high RPM/high speeds area.. (like halfway down the track, it's like I'm not really accelerating much) Of course it has 226,000 miles and I've never checked or changed the fluid/filter...

I'm going to go to the track this week probably anyway since it's always been like this each time I go to the track, but I definitely will be needing a transmission replacement soon.

So which should I get?