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Trans service: 1x3 with Type F still the way to go?

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Happy Saturday, y'all:

As was discussed in a number of threads, among others (especially these two: Best Fluids: Episode II, Inaccurate's optimal Racing ATF % thread), a lot of explanation has gone into the way to ease into Redline ATF fluids, especially on higher mileage engines.

The lowdown:
  • 2004 AT TL
  • ~180,000 miles
  • Original transmission
  • Honda OEM fluid in the tranny at the moment
  • Service wanted: 1x3 with Type F ATF, 3rd and 4th gear pressure switch replacement

After calling a few places, most won't do the kind of service I'm looking for (it's a really small market up here in the Idaho Falls area), so I called the one Honda dealer just to see if they knew what I was talking about and were willing to do it.

To my surprise, they had the lowest price, would do all the work at once, and would let me bring in my own parts and fluids (some dealers won't do that, even if your car is out of warranty).

Estimate was ~$150 for all work (the estimate I got was for a flush and fill, NOT a drain and fill or 1x3- he said he would talk to the tech and give me a precise number come Monday), taking about two hours, which doesn't include price of parts and fluids I would bring in myself. Strictly labor.

Four questions:

1. Considering the mileage (and how a flush has not been performed since I got the car at 127,000 miles- it's only been drains and fills with Honda OEM ATF fluid), should I be considering a flush with Honda OEM ATF for this particular service to "clean things out" and then wait for the next oil change to to a 1x3 with Type F? Is there any benefit to me doing that vs just doing a 1x3?

2. If a 1x3 is best, how much is too much price-wise for the 1x3 (considering the replacing of the pressure switches as part of the process)?

3. I remember reading that it's about 9 quarts of ATF that I should purchase for a flush/drain and fill. If I'm doing a total fill, should I get an extra quart (9+1)? If I'm getting a 1x3, should I get 3 quarts or 4?

4. No doubt I'll replace the ATF filter. Is it best to stick with OEM or go with a different brand? If OEM, what part number am I looking for? I saw the part number in a DIY thread listed as "25450-RAY-003" but on none of the parts websites I have seen does that trans fluid filter even come up. I've been digging and I only see oil, air and fuel filters.

I know this sounds so elementary and basic, considering how I've discussed with these techs (and on this forum) quite a bit about this work, but finding quantities is hit and miss on the threads that cover the topic, since they go more into the "theory" behind it and not so much the liquid amounts required for the work.

Thank you for your time in reading and I appreciate your help! Have a great day and happy driving!

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