[mrnickleye]

Get 3 qts of Dextron III ATF (or synthetic if you choose).

Have an old towel handy for drips, etc.

Have a trans funnel ready. (make sure it will fit the dipstick tube)

Have a drain pan handy to put old oil into.

Jack car up a bit on drivers side, use a jackstand for safety. Or, drive up on ramps. Or, park car with driver's side wheels up on curb to get that side high enough for you to slide under.

Slide the drain pan under the car, then you slide under car and remove tranny drain plug with 14mm wrench or socket/ratchet.

About 3 qts will come out. Clean the drain plug with rag, and wrap threads a couple of turns with teflon tape (get at any parts or hardware store for $1 a roll).

Re-install plug.

Lower car back down.

Add 2 qts of new oil via funnel. Don't over fill.

Start engine, shift thru the gears once with foot brake on, then check level as usual in 'park' position. Top up as needed.

You have now 'Diluted' your oil with new oil. Do this every month for 3 months, then every 3-6 months, and you will always have clean, nearly new oil. The tranny will last much longer now.