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-   -   Allison & TranSynd Fluid (https://www.wanderlodgeownersgroup.com/forums/showthread.php?t=9866)

davidmbrady 04-22-2011 04:17 PM

Allison & TranSynd Fluid
 
Some interesting stuff here written by a retired Allison engineer (yikes, there's that word again)! Scroll down a bit:

http://forums.motorhomemagazine.com/...d/24963117.cfm

ejallison1 04-22-2011 07:02 PM

Transynd
 
Thanks David. This has some interesting info. I was under the impression that transynd (tes-295) shouldn't be used in older units that had been running dextron III but this guy says it is safe to use. Stated seals should not leak if convert from dextron III to transynd. Specifically mentioned the HT740 series (Page 6, bottom) transmissions and the 643 series (last page). Those are the transmissions used in the 80's on the FC's and PT's. Also gives good description of how to flush (empty twice) and importance of oil analysis when deciding when to change transynd. Good info.

Patric 04-22-2011 07:08 PM

Wow good information!

Tranny fluid change was on my list and I would have gone with the wrong fluid looking in the blue box information. Thank you.

They want an awful lot of money for a service manual - anybody have one or a cheat sheet for filter/fluid change - would sure like to do it myself.

Did find this for us older bus types http://www.bustropolis.com/files/dow...ansmission.pdf

And this.

http://www.transparts.ru/pdf/at640_04.pdf

davidmbrady 04-22-2011 07:35 PM

I find it interesting what Tom Johnson says about obsolete standards in the fluids industry. When a standard is obsolete, then it's no longer tested by the major standards committees, and licenses are no longer issued. This means that anyone producing fluids to these standards is doing so without license or the required testing; consequently, they can put the standards label on any formulation they desire.

"I no longer recommend anyone use DEXRON-III. Use TranSynd or another TES-295 for the best possible performance and durability. DEXRON-III is an obsolete spec so anything these days is being manufactured under the label D3/M meaning DEXRON-III/MERCON. These fluids are manufactured and sold but have no license and are no longer approved by either GM or Ford. I used to sit on the GM DEXRON-III committee and I can tell you that these fluids are no longer evaluated by anyone at GM. So, it's sort of like "buyer beware" when it comes to any DEXRON-III (D3M) products on today's market. Also, do not use DEXRON-VI due to possible seal issues with your older MT transmission", Tom Johnson.

NH Bill 04-22-2011 07:52 PM

Quote:

Originally Posted by ejallison1 (Post 105340)
Thanks David. This has some interesting info. I was under the impression that transynd (tes-295) shouldn't be used in older units that had been running dextron III but this guy says it is safe to use. Stated seals should not leak if convert from dextron III to transynd. Specifically mentioned the HT740 series (Page 6, bottom) transmissions and the 643 series (last page). Those are the transmissions used in the 80's on the FC's and PT's. Also gives good description of how to flush (empty twice) and importance of oil analysis when deciding when to change transynd. Good info.

This info agrees with what my local Allison shop told me about changing to Transyd. He said the Dex III was still ok and a good product, but at next scheduled service recommend the switch to Transyd... unit will run cooler. The ol 643 is going strong and will be do for PM service this summer.

... and yes, thanks David!

NH Bill

dog2travel 04-24-2011 01:47 AM

Where do I get a sample kit from to run a Transynd oil sample analysis? Maybe it was in Tom's thread, but I missed it.

markusfmeyer 04-24-2011 07:19 AM

You can get oil testing done at many places. Shane recently posted about this place which I've started using:

http://www.analaboratories.com/commonroot/default.aspx

My coach had Transynd in it when I bought it. Their specs say to change every 3 years max, regardless of mileage, so that's what I'm going to follow.

Itchintogo 04-24-2011 10:09 AM

I took my truck to the Allison Dealer ( largely because I seem to have poor luck with GM dealers ) in February 2010 and had them service the transmission and switch to Transynd. They also changed the internal filter as well even though that is not recommended until overhaul. We like to be very thorough.

They had a slightly different recommendation than Tom. They told me to follow the old Dexron service schedule one more time because they can't drain the torque converter to get the proper amount of Transynd concentration. After the next service I can follow the Trandsynd schedule. I have not noticed any temperature differences in the transmission operating range and I have a gauge for this. But I feel the transmission function is very smooth and it should be very durable. It is just a good investment.

I think all Birds should only use Transynd and have felt this for some time now. It is one of the things I look for in maintenance lists/schedules. Also I look to see if the differentials are running synthetic as well.

I wonder if the ZF would like it? Anyone know?

gcyeaw 04-24-2011 10:59 AM

When Transaxel installed my Allison transmission they listed Transynd as the fluid. I can't see any difference in color, so I really don't know what is in there. Is there a way to tell?

rwoody 04-24-2011 11:02 AM

clear oil

dextron is red


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