Duramax Allison issue

[Mark Lewis]

Would the Trans Syn fluid be better in a 2001 1000 model Allison than the Dexron?

Originally Posted by Mark Lewis

Would the Trans Syn fluid be better in a 2001 1000 model Allison than the Dexron?

Yes! My 2003 has it. Smoother and less trans temp. Walmart is the best deal on approved Delvac Allison syn. I don’t use Castrol...

[monte385]

Originally Posted by Barry Polley

Yes! My 2003 has it. Smoother and less trans temp. Walmart is the best deal on approved Delvac Allison syn. I don’t use Castrol...

Summit's price was the best I found, never checked Wallmart.
Yes trans shifts smoother & runs cooler.

Works so well in the truck I’m tempted to try it in the race car.

[jmantle]

Originally Posted by Barry Polley

Works so well in the truck I’m tempted to try it in the race car.

I've used Transynd in Powerglides behind some big HP in an attempt to get better pump life when the pressure gets over 225 psi and it definitely seems to help. It is a full synthetic and a higher viscosity than regular Dex 3 fluid. Castrol was the original supplier when Allison wrote the specs for the fluid, TES-295. They have since added a few suppliers to the approved list. As far as what to use in an Allison, I wouldn't use anything that they haven't approved to TES-295.

Jim Mantle V/SA 6632

[Mike Rietow]

Allison part #. Change every other oil change. Deep pan and Transynd 30k. Transynd doubles the service life in conjunction with additional ATF (deep pan). Don't forget to take the magnet out of the old filter, to put in the new filter.