What Trans Fluid for My Allison ??
 

I have been running the Valvoline Dexron III/Mercon in my Allison transmission in my 2003 Chevy 3500 Truck.Is this fluid OK ?



DEXRON® III/MERCON

http://www.valvoline.com/pages/produ...asp?product=64

yes...that is what is in mine...2005 allison 1000

If you want to use a synthetic use Syn-Tran by Castol.You will feel the difference over Dextron 111

the name Dexron means is is GM approved;

DEXRON® -III
This is a specification for General Motors vehicles, but many foreign manufactures specify a DEXRON approved ATF as well. DEXRON-III can be used in transmissions that call for DEXRON-IIE or DEXRON-II.

http://www.chevron.com/products/prod...ntent/atf.shtm

Trans-Syn D. Proprietary Castrol for Allison product. Only available at Allison shops. I just happen to have one right around the corner. :cool: The 5 gallon pail is the way to go

Spin-on Alli filters $7.85 there too.

You won't "feel" a difference with Tran-Syn D but your tranny will. :)

other than that yup, Dex III

Changed my trans fluid for the first time not too long ago and have started using Amsoil. My Dad is a distributor, so I can buy it at cost and I think it is a good product. We shall see. I'm putting 8-10k miles a month on my '05 Allison, pulling a 40' flatbed and loads up to 15k lbs., so I'm hoping it performs as advertised.:cool:

http://www.imagehosting.com/out.php/...8_atd1g300.jpg

2nd vote for Allison TranSynd

its a gm, just use water, it should be fine.....

do I mix that with anything?

I heard...that you were not supposed to switch to anything....I had a stage 5 hop up.. heavy 5 pack sun convertor plus I just put a extra gear...6th.. and all kinds of tricked out stuff....and they did not say anything about this other stuff...hmmmm...plus....you are not supposed to change any oils from what you have been using from the start I thought..????...also when you take the pan down...get the magnet out and put it on the bottom of the filter....or get another magnet...you will see if they got it in that year...looks like a 2 inch washer....