I did a complete fluid change on the 11 Tundra (104k) using the trans cooling lines.
Disconnect the ATF cooling line at the rad and used a 1/2" plastic hose to a oil drain pan.
Fed a 3/8" hose to ATF fill plug (24mm) on side of trans. Used a paper clip to hold the ATF cooler actuator
open to insure complete system flush. Remove 14mm drain plug and loosen 5mm hex check plug. Both on
bottom of trans. Drained the trans pan (+/- 3qts). Drain plug in add 3 qts. Start engine and shift thru gears until
+/- 3 qts in drain pan. Rinse repeat 4x. (12.3 qts capacity). Drain and fill 1 more time. Reattach ATF cooling lines at cooler.
Used a paper clip to connect terminal 4 and 13 on the OBD port. Start engine. Shift from neutral to drive several times until the "D" Drive indicator
stays illuminated for 5 seconds and then goes off. (all sorts of dash lights blinking during this stage). Let idle until
the "D" stays lit. This indicates the trans temp is between 113-133 degrees F. Open 5mm hex plug and let
fluid drain to a trickle. Install check plug. Remove paper clip at ATF cooler actuator.
I did this in my garage. I have a shop that would have made it much easier but we're open 7 days.
Only drove for 5 or so miles to get to operating temp. Seems to shift smoothly and a much milder shift from 5-6.
(Perhaps TC locking?). The OEM WS fluid was slightly darkened but certainly seemed healthy. I tow a bit. Boat/PWCs/ATV.
The pic is the final drain of fluid. Nice and clean.
Had to improvise a ground strap I broke while paper clipping the actuator.
I used 4 Gals of Valvoline MaxLife ATF. $72.00
Purchased OEM gaskets for the Trans/Transfer case/Front/Rear diffs at Toyota $35.00 for 8 washers(***?).
I have decided to keep the old Tundra although I am enamored by the new 22 Hybrid Tundra.
Have ordered 3 gals of Toyota Super Long Life A/freeze for a drain and fill.
Replaced the plugs yesterday. (Denso SK20HR11) $8.00 ea. after discount. Oil in 2 of the tubes will require a valve cover gasket
set. Not so EZ.
Did the 3M headlight restoration which turned out real well.
Valvoline Syn gear oil on the way for diffs.
Love my Tundra. A bit less with current fuel costs.