I have been away from racing for awhile, have a race/street car. I used ford fluid then, what is a good choice now?

I used Walart Dexron for quite awhile with good results. Currently I've switched to JR1 synthetic. The trans frictions still look like new at last inspection. 300 passes@900hp.
Doug

Type F still works well
That is what I use in all my Mopar tranny except the later CTD H.D. O.D. truck tranny which get the stock type ATF +4
I run type F in my Bracket bomber with the after market powerglide per A-1 instructions also

I ran type F for years then Walmart Dextron 3. It worked great but when I was fighting a powerglide issue last year I switched back to type F only because that dog gone Dextron 3 stunk right out of the bottle new. I never smelled new transmission fluid that smells burnt new. Lol 😂

as someone who has used dex3 in FWD transaxles for over 20+ years with absolutely NO problems, when +4 is supposedly the ONLY thing to use, what happens to 46,7, & 8RH/RE overdrives when type F is used ? [or dex3 for that matter]

What FWD transmissions did you use Dexron in? What model years?

As for using F in a 42/44/46/47/48, that was never tested to my knowledge at Chrysler.
I would expect the same firmness in all gears. But the issue on the overdrive RWD transmissions is the overdrive geartrain gets fed fluid “leftover” from the converter return side. That’s a good indicator when fluid issues exist in an overdrive, the trans geartrain is good and the overdrive is toast.

As most everyone knows heat kills transfluid and it kills Dexron fast.
The materials lab at Chrysler ran tests and found that in an overdrive trans the Dexron is junk at 30k miles. One of the reason for developing +4.

If Type F has the same basic base stock and additive package it’s junk at 30k too.

ATF+4 synthetic works great.

Type F lacks the lubricating capability that most of the other fluids have and good lubrication is essential for the constantly-running OD gears. Also, the later fluids mitigate the converter lockup shudder that was common with the earlier fluids.

The first Mopar fluid formulated specifically to combat lockup shudder was the 7176 and that morphed into ATF+3 and eventually into ATF+4.

#68 or 100 synthetic hydraulic fluid.

I thought we had decided that the John Deere HyGard was the hot ticket for 2 and 3 speed race transmissions.

We? That would require total agreement...ain't gonna happen.

What would be the result/benefit if any to running ATF+4 vs Dexron or type-F
in a standard A-727/904 trans?

604/42LE/42RLE 4spd OD transmissions. 315k on a 95 with chrysler reman transaxle at 111k, 195k on 2000 with original transaxle, 146k on 2002 with original transaxle, and 162k in a '99 with original transaxle [current daily driver]. all of these in caravans, with the '95,'00, and '02 retired because the bodies fell off the floor pan.
also, my wife's 94 concorde with 142k on the clock. all of these transaxles had trans-go kits installed, for what that's worth. fluid and filter changed around every 10-15k. at first, it was just my ignorance of fluid types, but after no failures, i just kept it up. i then read a service bulletin that said to use dex3 if temps were under 40* constantly. so, i dunno, maybe i'm the luckiest guy in town ? remember, this is just MY experience with the front drive OD transaxles.
i was wondering, therefore, about type F in the A518. i did not know how the OD was lubed, but since it had clutches, i thought F would also help them lock up better. i'm missing something here, but i can't see it [old man's dysfunctional brain].

Same question pretty much. I use synthetic type F in my 727 and have good results.

My trans and converter builder strongly suggests to never use the hydraulic/tractor fluid. Only exception is to use it for a test if you think you need a tighter converter.

I've used Type F in my 727s for years w/ good results.

I have always used the fluid the manufacturer recommends. Putting Type F in newer computer controlled transmissions, could cause a lot of issues. Lock up converter lining damage, CVI indexes, etc. Most synthetic fluids have a higher boiling point, but have a different coefficient of friction than Type F. Lock up torque converters like a slicker fluid to function correctly. Back in the day type F was the way to go for a race trans. I use dextron in my race 727 with no issues.
Below is a link to a brief description of how each fluid differs.

http://automedicsafrica.com/all-about-automatic-transmission-fluids/

Coefficient of friction is the main appeal of using Type F in performance 3-speed automatics.

True. This is what I've used in all race units, 727,904,PG. Valvoline/NAPA Type FA. I'm not running them behind 3000 HP so I've never had to go the hydraulic oil route to try to keep it alive. I have tried a synthetic street fluid and didn't like how the clutches looked. Evidence of slipping on apply. Once you go to aftermarket friction materials and converters, what the OEM used is irrelevant.

I believe the synthetic stuff, though supposedly in keeping things a little cooler, tend to make things too slippery and thus actually either makes more heat by the slip or more seared clutches. I could be wrong.

I use old school Type F.

Paul at Turbo Action told me to use Dexron for street driving or bracket racing with his stuff, and Amsoil for class racing. Says that works the best for the components that he sells. Seems like okay advice to me since he is in the business and I'm not.