I finally found a place in town that works on Allison transmissions and they also recommend the Transynd fluid. They dropped the pan, changed the internal filter, changed the external filter, completely cleaned the inside of the pan and flushed the system with the Transynd and only charged me $250. I figured that was a great deal especially since it would have cost me about $200 for the fluid w/shipping charges and $20 for external filter and I didn't price the internal filter. Is that a good deal in all your books?


Anyway, I just have some questions about the Transynd. It feels like my transmission shifts a little harder. Not to the point of slamming into gear but enough so I feel a difference. Is this normal? Is there any need for concern for long term? How often should I change the fluid? Most of my driving in highway miles.


Thanks,


Jeff

I would say so. I need to check around but the one closest to me charges $450.00!!!! I am currently swapping in mobil-1 syn ATF. Figure it should be pretty darn good.

Maybe they just put food color in some leftover tranny fluid and didnt change your filters. Wow what a profit that would be.

Anyone who wants to do there own....hoot has a great system.


If you want to spend some time it will cost ya alot less and you can flush it yourself.


LOOK HERE -------------->>>>> Hoot's Method (http://onramp.uscom.com/%7Ehoot/cars/duramax/gmc/allison/allisonflush.htm)





Thttp://www.dieselplace.com/forum/smileys/Clown.gifNYEdited by: GMC-2002-Dmax

The tranny Filter from an Allison dealer only cost about $9.00, go the GM parts and it's $20!


Seems like a pretty good deal. If you are out of warranty and need Allison work always take it to an Allison dealer.....cost a lot less and you know it's done right the first time.


If they flushed it real good the TransSynd should last 150K. You want to be as close to 100% TransSynd as possible and you didn't say how many miles you had on the truck. I would change the fluid one more time after the next 50K and then you should be good to go for another 150K. I would also change the spin on every oil change or every other oil change. Some feel you can go much longer maybe 25K, but for $9.00 each the spin on is cheap insurance for frequeny changes.


You did the right thing for your Allison and added a lot longer life by great maintenance service.

I looked at Hoots method a few weeks ago and I was going to do it. I was getting ready to order 5 gallons of the Transynd when I ran across an ad for certified Diesel/Allison work. I called them up and sure enough they had Transynd. I was there when they worked on it and I watched them drop the pan and they changed the external filter right there and they ordered the internal filter. They originally thought it was a screen mesh on the internal one. They said there are a few Allison's out there that actually have an internal filter instead of a screen. They didn't charge me any extra for the internal filter because they already quoted me the $250. I watched him start up the motor and pump some fluid out and then added about 5 gallons of fluid and started the motor and left the line disconnected and it pumped out I would guess nearly a gallon before he connected the line back up. He said it is nearly 100% Transynd now. Anyway, I have 47,600 miles on my truck now. What I normally do to all my other vehicles is, when spring comes, I will drop the pan, change the filter and fill it back up. I think what I will do to my truck is change the spin-on filter every 7,500 miles and each spring just drain the pan and add what I need to fill it back up. it shouldn't be much more then a gallon to fill it up if I only pull the drain plug, should it?


Jeff

I finally found a place in town that works on Allison transmissions and they also recommend the Transynd fluid. They dropped the pan, changed the internal filter, changed the external filter, completely cleaned the inside of the pan and flushed the system with the Transynd and only charged me $250. I figured that was a great deal especially since it would have cost me about $200 for the fluid w/shipping charges and $20 for external filter and I didn't price the internal filter. Is that a good deal in all your books?





This is the same method my local Detroit-Allison service manager recommends. They don't worry about the fluid left in the torque converter. His theory is if you pump the new Transynd fluid into the transmission cooler line, it splashes down into the pan and mixes into the Dexron III fluid already there and you end up tossing out a lot of the new fluid with the old as well as leaving old fluid in the tranny. He figures you will leave the same amount of old fluid in there either way,unless you do this 3 times then you can get most of the Dexron III out, but at $50 for a 4 litre pail (cdn) for Transynd thats getting close to $500. Allison recommends leaving the 2/3 Transynd 1/3 Dexron III mixture in there until the next scheduled change. Then follow the same procedure at which time you should be good for 80,000 km till the next change. Dexron III is totally compatable with Transynd.