Transmission Flush vs. Drain & Fill

[1sexyleo]

I recently put a used transmission in my 02 Maxima (auto). It had 15k miles on it and my car had 74k. My car is now at 80k and I was wondering is it better to flush or drain & fill?

Going into 2nd is kinda slow but the rest of the gears are fine. There isn't any flaring or anything.
Modified by 1sexyleo at 2:20 PM 6/3/2008

[MaximA32]

The flush is just that. Think of your toilet. When you pull the handle, new water comes flooding in and replaces the dirty water. That's how a flush works.

Now for the drain and fill. Think of it as emptying a can of pop. When you empty it, there's always that last little bit of liquid in there that you just can't seem to get out of there. That's how a drain and fill works. There will always be that last little bit that you can't get to.

[DevonD]

Haha I like the analogy's MaximA32... but If the transmission you put in really only had 15k on it i dont know i would worry about it.. it could help i guess though..Where did you get it and how sure are you its only 15k?