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Tractor Talk Discussion Forum

O/T Auto trans oil change

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37 chief

07-30-2007 11:09:40




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When a vehicle has a auto transmission service, most places remove the pan, dump the ATF in the pan, check for metal, reinstall the pan, and filter. When doing this a lot of old oil is still in the trans. Isn't this like doing a half of an enging oil change? Stan




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John A.

07-30-2007 21:10:30




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
Stan, Go read my comments on Suburban towing on the Tractor talk board. I mention getting 100K more miles out of a 87 auto tranny by cutting the tranny loose from the Factory radiator cooler and useing the largest Aux-cooler I could get as a stand-alone cooler. Is a oil change that just does the pan and filter alone a half@ss oil change you be the judge.... The rest of the story is....At the place where I got my oil changed, I was visiting with the owner about tranny oil changes and how it would add longivity to the trannys life. He suggested to Not do a full blown oil change on it for the tranny allready had about 120 on it and we were not sure whenit was changes last. We bought it at 75K miles,
Anyway he suggested that the tranny may allready have some wear and putting a full oil change onit would "thin" the oil too much and bring on failure, So,,,,he suggested to "evac" out the 3 or 4 qt in the pan only. He had a Evac unit that would suck out the oil through a tube run down the tranny dip stick tube. I did this every 2nd or 3rd enging oil change. As I said in the other post I got another 100K out of that tranny before It needed work.
Now back to your question.... Yes in a way! but by the very nature of this thing It is OK unless the oil gets burnt. That is my opinion, Other factors are how much towing you do? How abusive are you to the tranny, Not overloading the truck/car causing overheating situations. etc., etc., etc. Hope this helps!
Later,
John A.

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dave guest

07-30-2007 19:48:09




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
Food for thought from an old Popular Mechanics mag. Cut line from trans to radiator, run engine until all fluid is pumped out. Immediately shut off engine, repair line and refill trans. Got to get everything out this way. Wonder if this is safe with modern cars???? Never tried it but have had leaks in lines and ran vehicle until transmission would not move without harm. Comments please.



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dds-inc

07-30-2007 18:31:56




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
You're getting an oil change... but you're not getting a transmission FLUSH.. which gets all the old oil out of the valving and torque converter.

Dropping the pan and changing the filter only works in crappy cars.



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Mike M

07-30-2007 12:13:12




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
Sometimes on some of the GM models here at work they can stick a hose in the spot for the filter and stick it in a jug of clean oil and start the engine and let it suck it up this will flush it out.



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dhermesc

07-30-2007 11:49:19




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
Most transmissions don't have a drain on the torque converter so you are only changing about half the fluid.

If your transmission is in "good shape" and you've been changing the fluid as recommended doing a "flush" by letting the pump replace the fluid is probably one of the best ways to do it. It takes about 3 quarts more then capacity ensure you get it all.

For the most part the "filter" is a screen and wear particles of "newer" transmissions are small enough to pass through. If your transmission is throwing big enough "chunks" to get caught by the screen its on its way out and changing the fluid probably isn't going to help.

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Greg_Ky

07-30-2007 11:47:24




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
Most places do not remove the pan any more they just flush through the cooler lines.



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Vern-MI

07-30-2007 11:22:48




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
Some also have a converter drain plug which can be removed to drain an additional 6-8 quarts of oil. When they don't have the converter drain plug you can have the system flushed where they allow the transmission to run while they drain the oil through converter discharge line. Converter discharge usually goes to the radiator cooler and then back to the rear of the transmission to be used as lube oil to the back half of the case.

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Gleanerguy

07-30-2007 11:20:07




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 Re: O/T Auto trans oil change in reply to 37 chief, 07-30-2007 11:09:40  
When I change the ATF on my truck, I pull the pan off and let it set overnight. You will get a lot more drainage this way. I suspect their is no way to get every last drop, though.



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