95seMax

iTrader: (11)

i am in need of changing my tranny fluid, i wanted to switch to a syntectic fluid like redline or amsoil to put in my auto tranny

what i want to know is ,do i really need to go get it done at a shop to do a complete flush , where they will charge me $100+ just to drain

or can i just go underneath , remove the plug and drain it myself , then refill it with a syntectic

the reason i heard for the need to go get it done is to completely drain out every bit of tranny fluid, gettin it done removes all 12 qts,
but it i were to just drain it from underneath it wouldnt remove all 12 qts, and remove only about 4 qts

now if thats true and it only removes 4 qts when doin it by myself and draining from underneath ,then if i were to install new syntectic fluid, it will mix in with my old non syntectic fluid, so there would be 8 qts old fluid, and 4 qts new syntectic fluid

is this true?will only 4 qts come out if i do it myself? so is it better if i get it done? will it be bad if i mix new syntetic tranny fluid with old non syntetic tranny fluid?

thanks for any feedback

95seMax

iTrader: (11)

bump

markargente

iTrader: (2)

when you drop the trans pan, there is still fluid left in the system. I'm not sure if the numbers you have are correct, but yes there is some fluid left over. What most places do, if they cant get a tranmission line to use a flush machine for, they'll take off the drain plug, fill some trans, and then "go through the gears" which means hold the brake down pull up the ebrake, and rev to like 2000 rpms in drive and reverse about twice. repeat the steps until its clean. If you hook up a flush machine, it basically does that for you. You can definitely get aline for the transmission though,

DNE

So if they go through the gears, obviously with the car on, won't it hurt the transmission to be draining fluid and running.... I know that is probably how it's done and the procedure must be very specific, but I'd like to know so that I can do this myself.

Thanks as well.

markargente

iTrader: (2)

Oops, i meant to go through the gears when you plug it back up and add fluid. You just keep doing it until your fluid is clean. Drain, plug, add, go through the gears. I would try finding a place to completely flush it. Maybe i'm just biased since I get it done for free at my place =)

cam_honestiam

iTrader: (2)

I believe that your transmission only holds about 4.5 quarts of fluid. The 12 quarts or whatever is how much they would use to flush and refill. There will almost always be some fluid left in the system.

95seMax

iTrader: (11)

so do u know if its good for me to drian the 4.5 fluids underneath the car and refill with redline syntectic fluid, mixing my old fluid with new fluid?

markargente

iTrader: (2)

No matter what, there will always be some old transmission fluid in your system. You might wanna try it twice or maybe more because you want to try and get as much as the old dirty fluid out. This wouldn't be as effective in getting most of the old fluid out as a machine.