Flush or drop the pan

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Nov 16, 2005 | 09:14 PM

scar98

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Flush or drop the pan

I was wandering which was better for your tranny.Flush the system or drop the pan and change the filter?

Nov 17, 2005 | 07:08 AM

Casey

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Flush. And if you want to change the filter, too, you can also do that. It's all in the instructions.

https://www.ford-trucks.com/article/...nsmission.html

Nov 17, 2005 | 07:26 AM

Holmesuser01

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From: Asheville, NC

If you pull the pan, you will have a better idea of what your transmission is doing. Flushing leaves junk in the pan. I always pull the pan and replace the filter on my truck, and gm car. No failures yet!

Nov 17, 2005 | 08:59 AM

Casey

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Quote:

Originally Posted by Holmesuser01

Flushing leaves junk in the pan. I always pull the pan and replace the filter

You didn't read the instructions I posted, especially the steps where it tells about dropping the pan and changing the filter.

Flushing will change more of the fluid than dropping the pan alone, even if you drain the torque converter. If you use the instructions above you will also change the fluid in the coolers and lines, valve body, clutches, servos, etc. Simply draining doesn't do that.

Nov 17, 2005 | 01:32 PM

andym

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From: Bonita Springs FL

I think what everyone is saying is you need to do both in order to perform a good service on your tranny.

Flushing doesn't clean out the pan or help the filter, and dropping the pan doesn't change all the fluid.

Nov 18, 2005 | 01:24 AM

TakeEm

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From: Groves, TX

Any idea if this procedure will work for an AOD tranny? I don't see why it wouldn't. I may be wrong though.

Nov 18, 2005 | 07:19 AM

Casey

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The AOD is almost identical to the 4R70W, and those instructions talk about the 4R70W, so yes, it will work.

I've used those on about 10 different cars and trucks. It works great on all of them!