What are you guys using? My transmission is a 71 model year, trans brake, street/strip deal with a 5500 stall 8" converter. Just wondering what fluid is recommended to be used with these transmissions or what works well.

Thanks!

I use whatever brand type F that A/Zone has on the shelf, plus 1 qt non detergent 30w oil.

My transmission guy swears by type F so that's what's in my 904. Yours is STOUT! lol

Dex/Merc Cheapest stuff you can find works.

Type F usually any brand but I preferr Castrol or Advance Auto brand.

Wally World Type F

I use Hyundai SPIII because it's free and it's synthetic. I don't use a cooler.

Thanks for all the suggestions guys!

I am going to be using a cooler, which I forgot to mention.

It seems there are quite a few using Type F...I was going to use dextron or mercon, or even standard ATF, but how come ATF? Is it superior to the other stuff? Just trying to understand to....and now I have to figure out how much I need with my summit deep aluminum transmission pan

Thanks!

This is my brothers post, worth the read on this subject.

https://board.moparts.org/ubbthreads/showflat.php?Number=7273186&page=0

Way back at the dawn of time - OK, the early '70s - I worked for the "slippin' twins" (Bob & Don @ B&M), and they'd chuckle about their Trik-Shift fluid, which was actually just Type F repackaged with their label.
I've used both Dex and F in the same trans before and couldn't really tell the difference; 10-sec SB/904 Duster footbrake car, basically stock trans with 4400 & later 5800 stall. Upgraded to a CRT 904 with the new/stronger motor, and John said to use Dex, so that's what's in it.
I'm currently running F in my '64 Savoy street/strip car, which is a kinda-mild RB/727 3000-stall footbrake car that might run a 12.0, because the 2 trans guys involved on that one like F.

chrysler/mopar AFT-4 is what I use in my 904. red clutches, 4.2 lever 3000 stall. etc. etc. i've also used redline with no difference. atf-4 gets my vote.

This sounds crazy but I've been running a mixture of Mobil 1 syn, Lucas semi syn & Lucas atf no slip additive. It went 5.69 @ 118 1/8 last time out. Clutches and bands usually out last other stuff . I use a TCI deep pan ,halo cooler and a moroso large cooler w/ a fan mounted on it.Usually it stays under 225* Unless I have to spot a slow car for several seconds.

I guess I can try Type F or Dextron/Mercon or ATF-4 and see which I prefer best, that is if I even notice any difference

I am having trouble finding type F here locally. My normal parts house shows that they are out and have it ordered,(Pennzoil) but no estimate of availability time. Checked some other places,,,nobody has any. I didn't/won't go to Walfart. Anybody else having this problem. I checked the internet and did not find any either??

I just changed the oil in my 904 . I`ve always used Type " F "and just bought it at Advance Auto Parts.

All type F except 1qt of Dextron. An old mentor told me this 30 yrs ago that there is an ingredient found in Dextron that is not present in Type F that is required (specified by GM and MoPar) and intended to keep the MoPar seals pliable and properly 'swelled'. So as long as you have some Dextron in the case all stays good and no leaks...FWIW

Could be an 'old urban myth' but I remember some places used to sell a 'universal' trans fluid so maybe there are ingredients not in both

2 quarts of synthetic and the rest is whatever brand of Type F...as recommended by my transmission and converter builder.