Replacement for Dexron III

[Jeff753]

I have transynd in my Allison but I have a Nelson hydraulic reservoir for my fan and power steering and a hwh tank for the hydraulic slide. What is the recommended replacement fluid for Dexron III and can you mix it with old Dexron III?

Found this on the www
Dexron VI
introduced in 2005, and was first used as the GM factory-fill automatic transmission fluid for model year 2006. All Dexron-III licenses expired permanently at the end of 2006, and GM now supports only Dexron-VI fluids for use in their automatic transmissions,[3] although fluids asserted by their manufacturers to meet Dexron-III standards continue to be sold under names such as Dex/Merc. These fluids are not regulated or endorsed by GM.[4]




Jeff
2001 Dynasty Regent tag axle
Cummins 350 8.3 ISC

[slowmachine]

I am happy to use any of the now-uncertified Dexron III products in these other hydraulic systems. For authoritative advice, I would call the manufacturers of each DexIII system and ask for a recommendation. I have a large supply of Valvoline MaxLife full synthetic multi-vehicle ATF and would use it without hesitation.



Mike
2000 Holiday Rambler Endeavor 40PBD
Freghtliner XC, CAT 3126B

[ShapeShifter]

Originally Posted by slowmachine

I am happy to use any of the now-uncertified Dexron III products in these other hydraulic systems.

X2 - I use the Dex/Merc III fluid in my hydraulic jacks. Using an uncertified fluid in a new transmission may not be advised, but I don't see that the hydraulic jacks are any kind of severe service. My PowerGear manual has this to say:

In most applications, Type A automatic transmission fluid (ATF, Dexron III, etc.,) will work satisfactorily. Mercon V is also recommended as an alternative fluid for Power Gear leveling systems

If operating in cold temperatures (less than -10 F) the jacks may extend and retract slowly.

For cold weather operation, fluid specially-formulated for low temperatures may be desirable. Mobil DTE 11M, Texaco Rando HDZ-15HVI, Kendall Hyden Glacial Blu, or any Mil. Spec. H5606 hydraulic fluids are recommended for cold weather operation.

Please consult factory before using any other fluids.

Given the rather vague wording and wide range of fluids mentioned, I don't think it's that critical. It's not an expensive transmission that operates under high stress and heat.

For your power steering/fan, I would look at your manuals and see what other fluids they recommend, or contact the manufacturer. I'm not an automotive engineer, but I would rate those systems as being more critical than the slides/jacks, but perhaps not as critical as the transmission?

[walt2137]

Jeff I have AW46 hydraulic fluid in my hyd system, why are you changing it does it smell bad or contaminated, that would be the only reason I would change it.

[R2Home]

For the transmission, I would not mix any other type of fluid with the Transynd fluid. As far as Dextron III, since it is kind of hard to find, you can use Dextron IV with out any issues. It is not advisable to go the other direction(putting Dextron III in a system the requires Dextron IV).

[Mr_D]

There has never been a fluid named "Dextron" but I've seen the name misspelled like that even in Allison publications.

[walt2137]

Mr D I don't think it matters we all knew what he was talking about.

[R2Home]

Us 'red necks' are not known for our correct spelling, but we do get the point across!

Originally Posted by Mr_D

There has never been a fluid named "Dextron" but I've seen the name misspelled like that even in Allison publications.

[Jeff753]

Originally Posted by walt2137

Jeff I have AW46 hydraulic fluid in my hyd system, why are you changing it does it smell bad or contaminated, that would be the only reason I would change it.

Changing the three filters in the Nelson Hydraulic Reservoir and need to replace what I remove to expose the filters with new.


Jeff
2001 Dynasty Regent tag axle
Cummins 350 8.3 ISC

[walt2137]

Jeff you can get them out with a coat hanger straighten out, no need to drain. I just fished the filters out of my hyd tank.