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Would it be safe to say that the trans fiuld would be 15-40w. Seeing how 3 types have been mentioned in past post.
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Stock Transmission fuild
- Thread starter tokarev
- Start date
Shark Bait
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Yep. 15W-40 is what military used in it.
Shark Bait
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Allison recommends ATF. There are several different fluids they allow in it. 15W-40 is not at the top of that list from what I researched. To switch it over it needs the 15W-40 drained, filters changed, filled, ran for about 30 minutes then repeat to flush out all oil. As the mixture of the 2 aren't recommended.
PowerstrokeNC
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Is the standard ATF oils for replacement if you do this either DexronIII or TransSyn if you want to go synthetic?
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There are several approved fluids that meet the Allison TES 295 standard, which is for synthetic fluid:
http://www.allisontransmission.com/parts-service/approved-fluids/on-highway-fluids