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Old 01-30-2012, 01:10 PM   #1
subiedude676
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Default Hard shifting when cold after ATF change.

Hey guys, quick question for you..

I did an automatic transmission fluid change a few days ago, basically replaced what came out after a few times, and now it seems as if when the car is put into gear from a cold overnight start it shifts a lot harder now that i changed it than it used to before i changed the atf in the car. I used the Subaru spec ATF-HP. Before I changed the fluid I never had an issue with a hard shift going from 1st to second and so on.

Any ideas as to what could be making the tranny shift harder? I read somewhere that after an atf change I should disconnect the battery overnight so that the engine ecu can reset itself and that could help the transmission since it is used to the older fluid being in it.
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Old 02-08-2012, 11:46 PM   #2
ciper
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Low fluid would be my first guess if nothing else changed.
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Old 02-10-2012, 02:26 PM   #3
Rally Monkey
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Did you check the fluid level with the car running? I use a measuring funnel after taking out ATF. That way I know how much to put back.

Last edited by Rally Monkey; 02-10-2012 at 02:33 PM.
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Old 02-12-2012, 04:24 PM   #4
subiedude676
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Thanks for the replies, after I drained fluid out I did measure what was taken out and I put the same amount of fresh fluid back into the transmission.

And yes, I have checked the fluid with the car running and even though its difficult to get an accurate measurement, it seems like it is the correct full level when hot and running.
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Old 02-14-2012, 08:52 AM   #5
Uncle Scotty
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get better fluid
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Old 02-14-2012, 09:29 PM   #6
Jerry_NJ
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Better than Subaru fluid?

I just did my first 30,000 mile ATF pan dump at 55,000 - I posted on this elsewhere and gave a few tips an noted how simple it is... but

I used Valvoline Max Life, claims to be helpful for tranys with more than 75,000 miles, more than I have.

I too measured how much came out, it was 4 quarts maybe an oz or two more. I put 1 gallon of Valvoline back in, yes using a long neck funnel (could Subaru put the check/fill tube in a more inconvenient location?).

As for using the dip stick to measure how full the trany is, I find it almost impossible to dip the level without "wetting" the whole dipstick. I have the same problem with the oil dip stick. What is the trick to get a "dip" line that is a clean line? Do I first have to run a "pipe cleaner" down the dip tube before putting the dip stick in?
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Old 02-18-2012, 06:42 PM   #7
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My thoughts are that when it is cold the fluid may be a hair low causing the rough shifts. We have seen this in slightly low filled ATs. We use either Subaru AT-HP or Amsoil ATF or Redline High Temp ATF.

Did you change the filter when you did the drain/fill? We do a drain/fill as part of all of our 30k services on AT cars as it is a cheap insurance policy.

-mike


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Call directly as We carry almost every manufacturer now, so before you buy parts call us.

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Old 02-20-2012, 01:44 AM   #8
subiedude676
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I actually did not change the filter right away, I picked up a new filter that I am going to be putting on the transmission tomorrow morning. I also picked up an extra quart of the Subaur ATF-HP. I am guessing it might be a hair low since the fluid is cold and hasn't had a chance to expand when it warms up. I am going to put the new filter on and add some more of the ATF-HP to see if that helps or not.

Thanks for the reply!
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