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Old Yesterday, 04:53 PM   #1
DoubleyouAreExMan
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Member#: 465720
Join Date: Apr 2017
Default Changing trans fluod without flushing

My WRX used to grind when going into 3rs and 4th gear. I had the trans fluid flushed but it didnt help at all, a few months later I tried the andrewtech cocktail and immediately the grinding stopped. It's been a few months and the grinding is starting up again. It's been maybe 2-3 months and the my work commute is not long so I havent put a lot of miles on. Am I just gonna have to pay to flush and refill my trans fluid every couple months or is there anything else I can do at home so I dont have to pay for the service? Can I just add some fluid to it without flushing? Noob questions here I know lol.
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Old Yesterday, 05:13 PM   #2
Mulder
Trust no one
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Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

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You can't really "flush" a splash-lubricated gearbox where the fluid isn't circulated through passages by a pump. This only applies to an AT or, to some degree, to some of the 6-speeds which do have a pump for some of the internals. So for your trans all you can do is a drain-and-fill.
If you have a grind and you know 100% it isn't clutch-related, then there is an internal mechanical issue with the trans and if it gets better with any particular fluid or "cocktail" that's only a temporary band-aid. The only way to really fix it is to either have the transmission overhauled or replace it with a good used one in better condition.
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Old Yesterday, 05:14 PM   #3
cdska
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Join Date: Nov 2016
Chapter/Region: NESIC
Location: Boston
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2002 wrx sedan,
2005 wrx wagon

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Do it yourself? Rebuild or swap the transmission? It's easy to drain and fill with minimal tools
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Old Yesterday, 05:15 PM   #4
DoubleyouAreExMan
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Member#: 465720
Join Date: Apr 2017
Default

Quote:
Originally Posted by Mulder View Post
You can't really "flush" a splash-lubricated gearbox where the fluid isn't circulated through passages by a pump. This only applies to an AT or, to some degree, to some of the 6-speeds which do have a pump for some of the internals. So for your trans all you can do is a drain-and-fill.
If you have a grind and you know 100% it isn't clutch-related, then there is an internal mechanical issue with the trans and if it gets better with any particular fluid or "cocktail" that's only a temporary band-aid. The only way to really fix it is to either have the transmission overhauled or replace it with a good used one in better condition.
I'm eventually going to need a new transmission Im just trying to get this one to last as long as possible.
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Old Yesterday, 05:21 PM   #5
DoubleyouAreExMan
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Quote:
Originally Posted by cdska View Post
Do it yourself? Rebuild or swap the transmission? It's easy to drain and fill with minimal tools

I don't have a garage or any way to get my car lifted up but Im all for buying the tools I need to get the job done on my own.
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