Draining Transmission Fluid? - Page 2

Bill UK · 05-13-2007, 06:29 PM

More info here.

http://www.cygnusx1.net/Supra/TechTips/transmission_filter.aspx

cars4me89 · 05-13-2007, 08:55 PM

well the reason its a bad idea to change old fluid if its never been changed is because the fluid gets all the dirt and junk built up and the hoses and lines expand and since automatic transmissions run by fluid pressure, the old fluid expands with the gunk build up and expands the hoses. So what happens when you replace that old gunked up expanded fluid with fresh new fluid? the transmission can build up the proper pressure to function. This is a very vague and general explanation and is probably partially incorrect, anyone else who knows more please expand on this.

gttwinturbomk3 · 05-17-2007, 10:17 AM

Quote:

Originally Posted by cars4me89

well hopefully you havent changed the fluid yet because if you said that the transmission fluid has never been changed it would be horrible for the tranny to put new fluid in if it is extremely old, the best thing to do if it is that old would be to have the trans live out its life with the same fluid in it.. do not change it

I would say it would have to be very old for you to not bother servicing it.

05-13-2007, 08:55 PM	#2
cars4me89 3" Exhaust Join Date: Jun 2006 Location: Phoenix, AZ Posts: 115	well the reason its a bad idea to change old fluid if its never been changed is because the fluid gets all the dirt and junk built up and the hoses and lines expand and since automatic transmissions run by fluid pressure, the old fluid expands with the gunk build up and expands the hoses. So what happens when you replace that old gunked up expanded fluid with fresh new fluid? the transmission can build up the proper pressure to function. This is a very vague and general explanation and is probably partially incorrect, anyone else who knows more please expand on this. __________________ 1987 Toyota Supra 7M-GE Natrually Aspirated Automatic http://www.cardomain.com/ride/2385905 Currently enrolled in UTI (Universal Technical Institute.. ya ya say what you want bout the school lol its got some nice benefits though), have about two years of auto experience so far.. only 18 years old. My supra's older than me :P -Phil

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05-13-2007, 06:29 PM	#1
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	More info here. http://www.cygnusx1.net/Supra/TechTips/transmission_filter.aspx