Hi Tom:
I've read through this thread (21 pages) as I'm picking up my new-to-me 1999 American Eagle this coming weekend and will be changing the transmission fluid and filters when I get it home.
Here's my question: If draining the fluid only removes about half of it, then you end up with a 50/50 mixture of TranSynd and old fluid after the initial change. If you repeat, you then end up with a 75/25 mixture of new vs. old, repeat again and it's 87/13, etc. I'm not an engineer, but that's just basic math.
Since you're recommending two changes, is the 75/25 mixture good enough for the long intervals now suggested?
I understand not everyone wants to pull off an oil cooler line and pump out the fluid (although I've done it on my gasser and it's pretty easy), but it sure seems like the only way to really get close to 100% of the old fluid out, not to mention it's much more cost effective. I would think even if you had to pay someone the extra labor to pull the line and pump, it would still be a wash compared to the cost of draining two times and the extra fluid. And you end up with nearly 100% fresh new TranSynd, versus only 75% using the drain twice method.
Thoughts?
