And most transmission shops and builders don't recommend a flush machine either.

 

Thats a Misconception or myth. If the transmission has been properly serviced through it's life it will cause no issues. It is a concern that some flush systems cant keep up with the transmission flow. A flush is no diffrent than draining all the fluid out and installing new! If your transmission shop dosent recomend it, They dont have a flush machine

 

I will keep u posted

 

And that's the problem with flushing - it's not a proper service. You have to change the filter. One too many flushes without a filter change and it's game over. Don't matter how clean the fluid is if the pump can't move it through a clogged filter.

 

Most in pan transmission filters are little more than a screen. We dont even run a flush machine. Most of our customers run a true filter in line, or with allisons the filters are spin on. I've yet to see flow issues with a in-pan filter!

 

They run around a 200um efficiency, more or less. So yes, as I mentioned earlier in the thread, they are rather poor filters. But thats because automatic transmissions tend to produce relatively large amounts of relatively large debris. The filter that comes with the Transgo TF2 kit actually "is" a screen. I'm not for or against flushing, per se. You just have to remember there's a filter in there. And it will eventually begin limiting flow. It goes downhill real fast after that.

 

Don't mean to jack the thread,which by pass filter do you use on the trans? I use the FS-2500 on my engine,its a tad expensive for a trans. Thanks-Casey

 

It's a GM PH5 equivalent on a universal-fit mount. They cost around $5-10:

http://stuff.is-a-geek.net/PhotoAlbu...ics/CRD_11.JPG
http://stuff.is-a-geek.net/PhotoAlbu...ics/CRD_12.JPG
http://stuff.is-a-geek.net/PhotoAlbu...ics/CRD_13.JPG

I't not what most might imagine as a typical bypass filter like your FS2500. It's just plumbed in bypass mode. I used this particular filter because it does not have an internal built-in bypass valve like alot of typical full flow oil filters. GM chose to integrate that into the engine block/mount for some reason. This way for my application, monitoring it's condition over a 30kmil OCI is a simple matter of feeling to see if it is still warming up.

I don't see the point of running a true low micron-rated bypass filter on a system the manufacturer designed for partial fluid changes running a screen-type filter. With a 20um nominal rating, this one catches about 10 times more dirt out of the fluid than the stock filter, in terms of particle size. I suspect the fluid shouldn't look much different drained at 30k miles than it did when it was put in, with any luck at all.

 

Put about 1K miles on the truck and drained the pan again with the drain plug I put in. Was able to get about 4-5 quarts out of it and it was still pretty nasty. Filled it back up with the New Holland tractor oil and again felt the noticable change on normal driving and low rpm shifts. Will run anther few miles and do another drain and maybe the fluid will start to clear up soon.

 

What is going to be the long term effects of using UHTF in your transmission? that is the question I would be asking. Well Its not very good for long term. It may seem to get better because the fluid is thicker then ATF+4. Thicker isn't always better. Your tc is designed to push a certain weight of fluid. Plus some hyd. fluid will foam UP. I am not Familiar with New Holland Tractor Oil. Does that oil have anti foaming agents in it?

We use UHTF at work in forklift. (Z/F. Clark, Allison drop box transmissions) It don't get burnt as fast as ATF. But Allison transmissions in spotting tractors we HAVE to use Allison's Synthetic transmission fluid On all electronic transmissions.

But I have no room to talk because i just screwed up and noticed after reading this thread that i have changed my trans oil in my 04.5 Dodge (48re), with the incorrect trans fluid. I used Dextron III. I just may have ruined my trans but that is my fault. If you add the wrong fluid or want to use the a different fluid. Then that is your choice. If there is something wrong with your trans and you are trying to save it for another year till you have $$$$ to fix it then it lasts that long, then more power to you.
but if it don't then your going to get a lot OF I TOLD YOU SO!!!