Rookie question

295PRO

New member
Jan 30, 2015
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I know I'll get hammered for this but what fluid is best for Allison trans. I have a 03 2500hd with 245,000 on it. . I'm putting a ppe pan on it and just wondering if there is a fluid recommended for it. Any help is much appreciated.
 

Huffy67

New member
Dec 26, 2014
270
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Arkansas
DO NOT put dex VI in it. Regular dex III or transynd. I personally use dex III


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Llyduckhunter

Member
Apr 3, 2015
40
0
6
35
Iowa
What's wrong with dex 6? When I worked at the dealer that's all we put in everything old or newer we didn't stock anything but dex 6.


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Huffy67

New member
Dec 26, 2014
270
0
0
Arkansas
From what I understand if you put it in the older 5 speed Allison's it will cause leaks because dex VI will ruin the rubber seals. After 05 or so they updated the rubber seals and then they were compatible with dex VI. I am a firm believer in this because after I bought my 03 I flushed the fluid and put dex VI in it. Over time it started leaking from several places.

Edit: I bought the truck with 180k on it and there were no Trans leaks. Didn't want you to think I bought the truck new in 03 lol


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Last edited:

Llyduckhunter

Member
Apr 3, 2015
40
0
6
35
Iowa
Well I guess I will have to return some fluid and get some dex 3 thank you for clearing that up


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