Well I just got done flushing the tranny myself today. I would like to share my experiences with anyone who would like to know because *** knows I wish I knew what I know now. First thing's first. DO NOT DISCONNECT THE TOP TRANNY LINE! The bottom line is the one you want to disconnect. Lets just say I made a huge mess, lol. Save yourself some troube and just simply loosen the bottom line going to the radiator. Next, get a piece of rubber hose and slide it over the flare fitting and put the other end in a large bucket. Have all your quarts of tranny fluid ready because this stuff comes out REAL QUICK! You want to try to put it in at the same rate the old stuff is coming out. Once the fluid color coming out of the hose changes you can hurry up and turn the car off. If you are changing the filter as well make sure to push it up as far as it will go. The bottom of the o ring will be about 1/4 to 1/2 inch into the hole. Reconnect your tranny lines and bolt your pan back on and you can now refill your tranny with about 5 quarts of dexron III. I chose mobil 1 synthetic and I am very pleased with the results. My vibration and whine in the torque converter are now completely gone and the transmission shifts quickly and better than ever. GOOD LUCK! You just saved yourself around $100+!

 

Guess no one cares

 

Wrong......

I care. I need to pull my tranny to replace my rear main seal. I am contemplating getting a new trans from Pro-Built, just waiting for him to get back into the shop so we can talk. However, I am gonna try this. Thanks for the insight.



fratsit
honolulu

 

interesting..... but i already changed the fluid and do not want to mess with now. not bad i'll do that one of these days.

 

No problem. If anyone has any questions feel free to ask.

 

Ive got a question for you, I want to go over to mobil one, you answerd my post about it earlier. Anyway i'm just curious as to how much fluid I should have around to do this. Do you think it would be cheaper to use that cheap $0.80 a bottle fluid to flush it out, then instead of shutting the car off when it changes color just letting it run dry (or is this really bad for it even though its not moving) the puting in the synthetic, or is it better just to do the flush with the synthetic? Also is there any type of o-ring or sealent on the line going into the radiator that should be replaced?
Thanks, I found this post very helpfull.

 

You will need about 11 quarts to do it, but I would have more on hand just incase you take too much out. There is no o ring or anything on the line. It is self sealing. Glad to know I could help. If you have any more questions don't hesitate to ask. I wouldn't run it dry either. Just keep putting the synthetic in through the fill tube at the top until the fluid changes color. Mine went from dark red to almost pink in color. You must fill it quickly though because it comes out REAL quick.

 

From a newbie, Thanks for the tip! Now, who makes the best overall tranny filter? And are you running any kind of deep tranny pan? (alum)

 

I just went with an ac delco filter from gm, and no, I am running the stock pan.

 

I use NAPA filters, never had a problem with them, apperently there oil filters are pretty good, i'm assuming the tranny ones are the same.

 

when is it that i'm supposed to remove the pan?

 

you have the pan OFF when your flushing??? I know I must be misreading. also one would think it would push out allot more than you can fill. Did you fill one quart at a time? or did you rig something else up.

Also what sort of vibration did you have before?

And Thanks for taking to time to share

 

You cannot flush with the pan on. You put the pan back on, fill it, then start the car while constanlty filling it untill the fluid comming out is clean. I'm pretty sure thats it...

 

yeap, the pan has to be on. You got it right.

 

What I did was get all of my bottles of tranny fluid ready by opening them and setting them close to where I could grab them, then I stuck a big funnel in the fill tube, started the car with the lower line disconnected and went to town. You have to pour as fast as you can because you are right, it comes out quick. I stopped a couple times too to help catch up.

 

The "average" auto tranny holds about 12 quarts of fluid. Just doing a filter change is about 5 quarts. This method of flushing works pretty well, IF you can keep up. Having everything ready to roll as our fearless leader stated is certainly a good plan.

My suggestion:

1. Flush trans as outlined above.

2. Drop pan, change filter.

3. Refill pan. (5 quarts)

4. Enjoy.......

Admittedly, this will take more fluid, but, it keeps all the fluid clean, and does not circulate dirty fluid through your clean new filter.

NEVER run your transmission without fluid. Good way to burn it up.

An excellent post. Thanks people.

 

next time I do this, I think I might try to restrict the flow by puting some type of valve at the end of the rubber hose, that way the fluid doesn't come out as fast. If you have 2 people it would make things easier as well.

 

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I think this would be about as good as a machine without the cost.

 

Great post... after all these years I was beginning to think that I was the only one around who did it this way.

 

I'm thinking maybe a tech article on this?

 

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i dont have the valve, it was just an idea. Anything would work as long as it would slow down the flow of the exiting fluid.

 

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i would skip the valve and just have two people working on the car.....or just use a 2 gallon gas can and pour all the tranny fluid in it and then use a funnel to pour it into the trans....that's what i do when i do it this way....seems pretty easy for me. That way the gas can holds about 9 or so quarts and you already have 5 in the pan....so it should work out pretty well. Gives you an extra 3 quarts to work with.

 

That's a good idea. I might try that next time.

 

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