ATF power flush?

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Jan 5, 2006 | 09:21 PM

sdastg1

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Driver

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From: ks

ATF power flush?

I'm slowly knocking off the maint. items off my check list. Next up is the tranny fluid needs to be changed.

I have a 92 SC400, with 126k miles. I don't know the history on the vehicle.

It clunks when shifting into Drive or reverse. But otherwise shifts smoothly through the gears while driving. It's not severly bad, but it is noticable.

I was thinking of taking it to Aamco to have them do a power flush and refill it with new fluid.
I've read that it's not a good idea on high milage engines that have not had this done before. Does anyone know if there will be any problems with getting this done? Also will this fix my clunking problem when shifting into gears.

thanks in advance.

Jan 5, 2006 | 09:28 PM

Pheonix

Lexus Champion

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From: AL

It's not good to shove fluid through the system. It's always good to flush it, old fluid & deposites are nasty. Not flushing transmission fluid is what keeps the old mechanics that came up with that BS in biz in the first place.
AFA power flushing, it depends on which machine it is. I think the best way is just pulling the cooler lines off & letting it do it itself. It's basically a high speed drain & fill that get's almost every drop of fluid out instead of just a small percentage like a drain & fill of the pans do.
Let's face it. Most A/T transmission pumps make between 150-280psi anyway. They can shove the crap out of the valve body by themselves without help.

Jan 6, 2006 | 06:46 AM

sha4000

Lexus Test Driver

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From: N.Y.

Quote:

Originally Posted by Pheonix

i agree with pheonix, just remove the line going into the radiator but make sure to drain the fluid out of the pan first and refill it, then stick the cooler line in a clear plastic jug so you can see how much fliud is coming out every time that you crank the car, then shut the car off and replace the amount of fluid that comes out, crank the car and shut it off again, just reapeat this process until yousee that the fluid thsat iscoming out of the transmission is new and your good to go REMEMBER dont let the car run too long b4 you add new fluid or you could danage the tranny

Jan 6, 2006 | 12:01 PM

sdastg1

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From: ks

ok, thanks for the input guys.

Jan 7, 2006 | 10:42 PM

sdastg1

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Driver

Joined: Aug 2005

Posts: 133

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From: ks

Two more quick question.

1) What's the total amount of ATF fluid I need to replace if I'm going to drop the pan and drain from the radiator as well?

2) What type of ATF do I need for a 92 SC400?

thanks

also for anyone looking to do this in the future, I found some great instructions on this site:

http://www.amsoil.com/faqs/ATF_and_F...Procedures.pdf