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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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Old 09-15-2014
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Rollin' OldSchool Rollin' OldSchool is offline
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Default Allison transmission oil 15/40wt ?

I went by Stewart and Stephens the local Allison dealer the other day to get some parts and asked. Them about dextron 2 and all they had was synthetic oil. But they said all they ever put back in the transmissions was 15/14wt . I look in my Allison service manual and says you can run 10wt down to 0 degrees 30wt down to 32 degrees and dex2 down in the negative. I doubt I will ever be in the negativs so I was wandering if it Will be okay to run 15/40 in it like they say they do or will it mess something up . And this is in my PT
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Old 09-15-2014
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Just don't put synthetic oil in it.

On my '95 we used Dexron III. Readily available. Why not use that? I believe Dexron III is compatible with Dexron II.
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Old 09-15-2014
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I would not change over to 10 / 40. What you have in there now has worked fine for 26 years.
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Old 09-15-2014
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I'd stick with Dextron and it's available everywhere!
Just a note.. I try to carry as little as possible AND try to keep things simple. So, I run Dextron in everything! Power Steering, Tranny, levelers, and a primer for my fuel filter! That way I never get mixed up as to what goes where AND I only have to stock one oil for all those things... Simple! :-)
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Old 09-15-2014
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Whatcha you want to do, screw up something If it ain't broke don't fix it, it is use to Dexron so don't change the formula now.
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Old 09-15-2014
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Quote:
Originally Posted by rrueckwald View Post
Just don't put synthetic oil in it.

On my '95 we used Dexron III. Readily available. Why not use that? I believe Dexron III is compatible with Dexron II.
FYI, all oils are backward compatible. So Dexron VI (the newest iteration) is compatible with all previous versions of Dexron.

I believe that the oil must meet Allison C-4 designation...Dexron III does (as well as IV, V, & VI).
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Last edited by NealinNevada; 09-15-2014 at 05:58 PM.
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Old 09-15-2014
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When I had my Allison rebuild 3 years ago 15-40 engine oil is what they installed and recommended. This is one of the biggest truck transmission specialists in the Los Angeles area. The transmission has performed without any trouble for over 20,000 miles.
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Old 09-15-2014
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Quote:
Originally Posted by lucaswillemse View Post
When I had my Allison rebuild 3 years ago 15-40 engine oil is what they installed and recommended. This is one of the biggest truck transmission specialists in the Los Angeles area. The transmission has performed without any trouble for over 20,000 miles.
The optimum word here was REBUILT, I know of too many guys who changed flavors of oil in the past just to find out after they developed leaking seals it was not a good ideal. If you had a complete rebuild that is a different story, it's almost like starting with a new transmission. I believe there is a difference but it ain't my transmission just saying.
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Old 09-15-2014
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You are right John. I would not change the type of oil in an engine or transmission unless it was rebuild. The same thing very applies in going to synthetic from regular oil in engines.
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Old 09-15-2014
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Quote:
Originally Posted by lucaswillemse View Post
When I had my Allison rebuild 3 years ago 15-40 engine oil is what they installed and recommended. This is one of the biggest truck transmission specialists in the Los Angeles area. The transmission has performed without any trouble for over 20,000 miles.
The Army specs 15W-40 for all the Allison trannys in their current equipment lineup.
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