Thoughts on Allison / Castrol TranSynd 668? (1 Viewer)

[vankho]

Hi all,

Currently in the middle of researching for first upcoming Rodney flush project for my FJ62 - A440F. There's a lot of old threads of previous owners speaking to the merits of going synthetic especially with the Castrol TranSynd formulation.

However I'm coming by a lot of reference to a new TranSynd 668 formulation that is fully backwards compatible with TES-295. It looks like it was just released this year too so it's pretty new in the market.

Anyone have any insight? Ultimately, can the A440F run on it?

Add some spec sheets and details below:

On-Highway Fluids

Allison Transmission TES 668® introduces the next generation of synthetic automatic transmission fluids for long-haul applications.

allisontransmission.com

https://www.castrol.com/content/dam/castrol/country-sites/en_us/united-states/home/commercial-vehicle-oils/castrol-transynd-668-brochure.pdf

 

[cruisermatt]

Tractor fluid works good if you want to really tighten it up

 

[gummycarbs]

Here's a low-quality MSPaint combination of the Castrol product datasheets for the two: