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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission. |
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#11
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My local factory Allison shop insists that we use Dexron III that meets Allison's spec TES 389. Other oils may lead to seal problems.
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Matt Doyle Abbotsford, BC '87 PT38 '13 Queenie |
#12
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Matt, interesting that you bring up TES 389 spec. I am looking at this Service Information Letter from Allison (dated 8/2011) and it states:
DEXRON® III and DEXRON® VI fluids are no longer approved for use in Commercial On Highway transmission products and have been removed from the Allison Approved Non-TES 295 or Non-TES 468 fluids list.
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Neal 1994 WB40 and slow '73 Nova SS & '03 Corvette Pomerene, AZ Once more I have to ask "What did humans ever do to deserve dogs?"
Last edited by NealinNevada; 09-15-2014 at 06:55 PM. |
#13
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Quote:
As I understand it, backward compatible does not mean forward compatible. I wouldn't put Dexron VI into any Dexron III machine. Seems like we need an oil expert here.
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Ron & Dorinda Rueckwald St. Joseph, MI |
#14
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No, all new oils have to be able to go backward (i.e. backward compatibility) in time. That is Dexron VI can be used in a unit specing Dexron III. Dexron III should not be used in a unit that spec's Dexron VI however. As an example...Dexron VI has a lower viscosity than Dexron III does, but it is so much more resistant to shear, that after Dexron III is used a short time it has the same viscosity as Dexron VI. Therefore, Dexron VI can be used in a older vehicle specing Dexron III....but...you can't use Dexron III in a tranny that specs Dexron VI (it would be to high a viscosity).
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Neal 1994 WB40 and slow '73 Nova SS & '03 Corvette Pomerene, AZ Once more I have to ask "What did humans ever do to deserve dogs?"
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#15
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Quote:
I used a Valvoline product lately that meets the spec.
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Matt Doyle Abbotsford, BC '87 PT38 '13 Queenie |
#16
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The only reason i was asking is I had to reseal the torque converter and the input shaft seal so had to drain the fluid, so I guess im going back with dextron since I didn't rebuild the whole trans and the othere seals are use to it
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Jeremy Lane 1979 FCSB 35' 1986 pt 38 8v92 Wichita Falls , Tx |
#17
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all military Allison use motor oil!
seen a bunch of humvee with it too~!~
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RWoody 2 miles east from Texas Highway 37-97 South Texas 1979 XV Turbo Cat and 2 Speed rear end USAR Retired Pleasanton Tx 78064 Do not use PM... please use rwoody@fullnet.net |
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