synthetic trans fluid

cutty72 wrote:

Cummins12V98 wrote:

cutty72 wrote:
Yep, straight AMSOIL for me in trans, transfer case, diffs, and engine.

Power steering pump?

Not yet... It's on the "to do" list.

It drains real easy on mine, I removed the two spring clamps on the hoses under the truck let it drain and filled. I think it takes ATF, my 98 used Power steering fluid.

Cummins12V98 wrote:

cutty72 wrote:
Yep, straight AMSOIL for me in trans, transfer case, diffs, and engine.

Power steering pump?

Not yet... It's on the "to do" list.

Norskeman wrote:
Transynd for me - purchase at the local Detroit/Allison diesel shop. Drain and fill twice for a full conversion to synthetic.

I did a complete fluid exchange to AMZ/OIL ATF at around 2K on my 2011 RAM Dually HO.

That way you get ALL the old fluid out is very easy even with out a converter drain plug.

Drain the pan, change filters. Pour fluid into a container that has measurements on it. Pour the same amount back into the trans. Now you are full but not done! Remove the feed hose to the trans cooler at the front of the truck. have it where you can have fluid come out into that same container from earlier. You may need to add a hose to the cooler line. Now have someone to start the engine, start the engine and when the fluid starts to sputter from the line shot off the engine. Now add the same amount of fluid back into the trans that you just drained into the container. Repeat until the fluid runs bright red then add the correct amount back. Keep track of the amount drained so you know when the exchange is about complete. If your system takes 18 qts for example you will probably use 20 qts. Re install the trans line. Take it out and get the fluid warm and check level and adjust.

Very simple, done this procedure many times.

Synthetic handles more heat before breaking down and has less flow resistance to let it run cooler.

Transynd for me - purchase at the local Detroit/Allison diesel shop. Drain and fill twice for a full conversion to synthetic.

Yes-Amsoil makes ATF for the Allison but it is NOT approved by Allison.

Sorry OP, did not mean to hijack your thread.

Charlie D. wrote:
I said Amsoil nor Royal Purple are on the ALLISON approved list. Allison is no longer part of GM. They are also not TES-295 but TES-389. That being said, Amsoil and Royal Purple, IMO, should do very well as a synthetic in any transmission.

AMZ/OIL does make a trans fluid for the Allison.

The Universal ATF is for most auto trans.

cutty72 wrote:
Yep, straight AMSOIL for me in trans, transfer case, diffs, and engine.

Power steering pump?

I said Amsoil nor Royal Purple are on the ALLISON approved list. Allison is no longer part of GM. They are also not TES-295 but TES-389. That being said, Amsoil and Royal Purple, IMO, should do very well as a synthetic in any transmission.

Charlie D. wrote:

Ozlander wrote:

Charlie D. wrote:
Although Dexron VI is a tremendous fluid it is a synthetic blend.

Not if you use Valvoline DEXRON-VI Full-Synthetic Automatic Transmission Fluid.

You are correct and I knew about Valvoline. A number of people have made blanket statements that Dexron VI is synthetic which is not the case. When researching what synthetic to use in my previous truck I found the Transynd which is made by Castrol and IIRC, was the only true ATF synthetic at that time, Along with Valvoline there may be other brands but I have not researched it.

Neither Amsoil nor Royal Purple are on the Allison approval list. GM may approve them.

I just "bumped" the following from the Class A forum: "Let Me Know if You Have Allison Transmission Fluid Questions"

You have to pay GM to be approved, and/or give them monies for each quart sold. Amsoil doesn't seem to want to play their game.