Tranny flush or not??

[MNSy2899]

Did a few searches and didn't come up with much, so...

Is a tranny flush at a shop the way to go when changing the fluid? I have talked to a few tranny shops and they said they don't recommend it, rather they recommend letting the fluid drain and cleaning the pan out. They said the flush just ends up stirring stuff up..

What fluid does everyone prefer? I was thinking I will just go w/ Dexron III and Lubeguard....unless there are significant advantages in going with synthetic or Type F. My tranny is shifting firm as it is, but i do get the TC shudder every once in awhile when it tries to lock up on the highway.

Lastly, how much more fluid will my Derale pan hold and should the filter in our truck be replaced or can it be cleaned?

Thanks for the advice as usual.

Adam
Sy #2899
Eden Prairie, MN

 

[ParTyBoy]

Re: Tranny flush or not??

Did a few searches and didn't come up with much, so...

Is a tranny flush at a shop the way to go when changing the fluid? I have talked to a few tranny shops and they said they don't recommend it, rather they recommend letting the fluid drain and cleaning the pan out. They said the flush just ends up stirring stuff up..

What fluid does everyone prefer? I was thinking I will just go w/ Dexron III and Lubeguard....unless there are significant advantages in going with synthetic or Type F. My tranny is shifting firm as it is, but i do get the TC shudder every once in awhile when it tries to lock up on the highway.

Lastly, how much more fluid will my Derale pan hold and should the filter in our truck be replaced or can it be cleaned?

Thanks for the advice as usual.

Adam
Sy #2899
Eden Prairie, MN

member bronging this up with hunter couple years back, ... hunter was talking with hartman and hartman's take was that it's not a good idea to flush the stock converter unless you have burnt fluid... pan change and filter should be fine if your fluid is cherry.. just make sure your tranny is hot when you pull the pan, to put in the good stuff like Mobil 1 synthetic ATF, and a bottle of lubeguard... Unless you feel like doing fluid changes every couple thousand miles I wouldn't go with type F fluid.... tranny filter should be replaced... Make sure it is the 4L60/700r4 filter and "NOT" the 4L60e filter... filter and gasket from GM will cost you around $15 from what I recall... Derale pan holds one more quart I think....

On a seperate note it is my understanding that you can "not" flush an "aftermarket" lock up converter at all... supposedly it ruins the converter... I'm not the tranny guru by any means... someone else can clear this up and explain more thoroughly..

 

[Hu Ryde]

You can get about 80% of the fluid out of your trany if you just let it sit without the pan for a couple of days, most of the fluid that will be left is in the TC, it will not drain back into the tranny because of a drain back ball. go through the gear selections to help remove fluid even more. On my tranny I removed the ball to help performance, my TC drains back into the tranny for the most part because of this. If your fluid is burnt change it at home with new filter and clean pan and then have a flush done. It doesn't stir anything up because they unhook your cooler line at radiator and flush it there. There is no forced fluid into the tranny, your tranny pump is pushing old fluid out into a tank that is seperated by a piston and the piston then pushes the new fluid in back through the return line at the radiator. There is no external pump forcing fluid into your tranny. But change your fluid first at home because you dont want to loose al the fluid you paid for at the flush center. The 9/11 can be flushed because when George got his it had blue crap in it and was considering having it cleaned and Rusty said it was ok to do. Waller said Type F was ok???? Anyway I have Mobil 1 now. HTH!

 

[MR_MNZTR_SY]

i'd swear type F was for fords only, kinda their version of dexron III....

 

[Hu Ryde]

Your right, it is made for Fords but it can be used in our application. What it does is firms up shifts. But as I found out the type F fluid cannot hold the heat like a synthetic can.