Duramax Allison issue

[Ralph A Powell]

Y

Originally Posted by ss3011

This is interesting ! Did you change the Fluid when you put the aftermarket filter in ? What happened when you say you had down shifting problems ? Did the problems go away immediately when you installed the GM filter ?

It's a Allison trans not a GM design and manufactured trans!

[ss3011]

Originally Posted by Ralph A Powell

Y

It's a Allison trans not a GM design and manufactured trans!

Allison was part of GM Hydramatic when the 1000 was developed . The Engineers from Indy work side by side with us in Ypsilanti . When GM went through bankruptcy Allison was spun off but the only Allison trans that remained with GM was the 1000 because it was in most of the 1-ton pickups . I think it's still built in Baltimore . Also Castrol developed the fully synthetic fluid Trans-Max , and later Allison re-named it Trans-Syn . It is a very good Automatic Transmission Fluid

[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