Do you think AMSOIL 100% synthetic automatic transmission fluid is good for a Powerglide? Or is too slick because it is synthetic? Looking for opinion, good or bad

Having tried most everything, Castrol Allison Transyn has been my go to fluid for the past 5 years.
2nd choice would be Lucas semi synthetic.

I used to run Mobil 1, then ran cheap NAPA brand Type F, and now have been running Castrol Transynd for a few years.

I’ve honestly never been able to tell a difference between any of them.

People who know better than I seem to think the Transynd resists breaking down better than just about anything, so I use that.

The way I look at it is if Transynd holds up to heat and abuse in big trucks, buses, Motorhomes etc, it with take the abuse of a racing trans.
I swiched to it while running a blown TD and was burning trans on a regular bases

Allison TES-668 is my only choice and can be purchased from the following fluid manufacturers as it is a licensed product. Included is their license number to produce.
TES-668

I use the Exxon Mobil Delvac 1 ATF 668 from my local Farm+ Fleet. It’s all the exact same product if on that list.

Amsoil racing atf in mine for a lot of years now

I have been running Mobil 1 Synthetic trans fluid for years.

I've always run the cheapest generic Dexron I could get my hands on, and never change it.
Considering going to something "better", should the occasion arise to drain what's in it.
Pretty sure most of the fluid in it right now is from 2003 or so.

Transynd is the best you can get. I've been running Amsoil racing fluid for the last couple of years as well. Both are great and I've had no issues with either.

Lucas Semi Synthetic or Allison 668, never saw any difference in temperature or car consistency. For what it's worth, Hughes deep pan (2 extra quarts) tightened the consistency.

Honestly, the only difference was the $$$$$$$$ I spent. My oldest son Mike has always used type "F" in his TD.

Bob