BAC Forum

General Boards => Technical Support => Topic started by: Adam Hicklin on September 02, 2014, 06:05:59 AM

Title: Trans. Temp after fluid change.
Post by: Adam Hicklin on September 02, 2014, 06:05:59 AM

I finally bit the bullet and had my transmission fluid changed to Transynd.  Took it to a reputable Allison Authorized service provider and they said they purged the trans cooler and torque converter (I'm going to send a sample to be analyzed to be sure). The problem:  I noticed a slight difference in shifting smoothness, but no difference in running temperature.  With standard fluid it was running 185-189.  With Transynd, it was the same.  In fact at one point today it got to 192, which it never did with the Dexron III.  This was level road and not even close to max weight on a warm, but not hot, day.  And fluid level is on mark according to the keypad check.

Maybe I had my expectations set too high.  I was really hoping for reduction in ruining temp.  Anyone else have a similar experience?

Title: Re: Trans. Temp after fluid change.
Post by: Joel Weiss on September 02, 2014, 12:57:21 PM

Those are exactly the temps I get with mine using Transynd.  I've never owned mine when there wasn't Transynd it in so I can't make a comparison.

Title: Re: Trans. Temp after fluid change.
Post by: Gerald Farris on September 02, 2014, 01:04:28 PM

Adam,
When I changed my transmission over to TranSynd, I noticed about a 15 degree drop in transmission operating temperature. However, since the transmission cooler on your coach is located in the lower radiator hose, there is a limit to how cool your transmission can run. At times, the transmission cooler will actually increase the fluid temperature to facilitate warm-up. Your temperature readings seem to be fairly normal.

Gerald

Title: Re: Trans. Temp after fluid change.
Post by: Les Brandt on September 02, 2014, 05:54:31 PM

I would think that the synthetic would stand up better to higher temperatures without burning or breaking down. Still a better choice.

I'm at 40,000 miles and am starting to think about changing mine to synthetic. What's the costs to do this?

Title: Re: Trans. Temp after fluid change.
Post by: Harold and Gloria Skipworth on September 02, 2014, 08:01:34 PM

I changed trans fluid at 60k miles just because the manual suggested I do so. I didn't see any difference as I had transynd previously installed.  I asked the dealer , Allison, when to bring it back and he said at 150k mi.  Synthetic , cheaper by the mile?

Title: Re: Trans. Temp after fluid change.
Post by: Steve Huber on September 02, 2014, 08:41:34 PM

I saw no apparent operating or temperature change when converting a 4000 series transynd. However, I had a very noticeable improvement in shifting smoothness when switching a 3000 series to transynd.
Steve

Title: Re: Trans. Temp after fluid change.
Post by: LaMonte Monnell on September 03, 2014, 01:40:09 AM

Shifting a lot smoother but overall temp changes were not really noticed.

Title: Re: Trans. Temp after fluid change.
Post by: Adam Hicklin on September 03, 2014, 06:37:54 AM

Les, it cost $500 out the door.  That was Transynd ($47/gallon) new filter set and labor.  And misc. CA fees, of coarse.  

Title: Re: Trans. Temp after fluid change.
Post by: Les Brandt on September 04, 2014, 04:40:49 AM

Quote from: Adam Hicklin

Les, it cost $500 out the door.  That was Transynd ($47/gallon) new filter set and labor.  And misc. CA fees, of coarse.  

Thanks Adam. I knew it wasn't cheap.

Let me see now.....change that to Canadian funds.....$8000. LOL