Atf?

For the Cyborg Transmissions...
https://www.cyborgtransmissions.com/...n-Instructions

Use Type F or FA, non-synthetic fluid only, and do not overfill!

Use of any other fluid will void the warranty

NEW (September 2015) fluid level instructions

There is a “full hot” mark on your dipstick that indicates the proper operating fluid level. The distance between the “full hot” mark and the bottom of the dipstick is NOT an operating range.

1. Start the engine let idle and shift to forward and reverse a few times. Shift to neutral and bring the engine RPM up to at least 3000 in neutral to purge air from the oil cooler.
2. Drop engine RPM back to 1000 or so, pull the dipstick and wipe clean.
3. With the engine still running in neutral at 1000 RPM insert the clean dipstick fully into the transmission, withdraw and read the fluid level.
4. Add or remove fluid as necessary so the fluid is up to the “full hot” mark.
5. For further convenience, allow the transmission to cool and drain down for at least an hour, then make a “cold level” mark with a file on the dipstick.

From a post a couple weeks ago.

Tks guys - thought I had read non synthetic also a while back and posted this to be certain but was at the auto store shortly there after. I purchased synthetic cause that’s all they had. I’ll be returning that in the morning.

They didn’t have any non synthetic but will find some elsewhere. Even all of amsoil was synthetic. Like 5 different types even.

Ive always used F and both of my transmissions have been trouble free.
I think the key is to keep em cool.
I use a 8plate bellhousing cooler.