lyricspap

well i have 06 5.4 bought it last feb. with 77,000 mi. on it.don't know anything about previous history of it other than someone installed a trailer brake controller. i have 100,000mi. on it now. so question is should i change tranny fluid or leave alone,i've heard different opinions before so just wanted to see what you guys thought,thx,m.

brnr17

im in the same boat, interested in the responses

Especial86

iTrader: (1)

Yes both of you should change the fluid and filter..


https://www.f150forum.com/f4/transmission-drain-plug-install-pan-flush-pics-206146/

Tuner Boost

especial is correct. This is one of the most ignored critical maintenance steps. Understand that the trans is no different than neglecting your engine. The transmission fluid provides lubrication of the internal parts and also acts as a hydraulic fluid to clamp the clutches together, etc. Auto trans fluid breaks down quite quickly if temps exceed 220*F, and it also is very high in detergents to keep debris and normal wear particles from clogging the solenoids and small passages/circuits that operate all the shifting, TC lock-up, etc. So never go more than 50k miles (20-30k miles if towing or running hard) and the filter should be changed at the same time. Another thing to consider is when just dropping the pan to change fluid/filter you are at best only changing 4 qts of an average 1`2-14 (depending on trans model) so a trans flush, or complete change is really needed, and this requires a service center with the proper machine, or a DIY guy/girl can disconnect the outlet trans cooler line (usually the lower one, but varies so verify) at the cooler and with 2 people, you can have the line directed into a 1 gal container...have the helper start the vehicle, and watch as the fluid fills the jug. As SOON as you see any bubbles (air) have your helper shut the vehicle off. Pay attention to how much was caught (usually just under a gallon) and then add new fluid of the same amount. Repeat 4 times and you will have flushed the old out yourself. Ensure it is up to proper level then while at idle in park (after you have of course re-hooked up all lines) and your good and saved a few $hundred. If your NOT handy, don't attempt yourself.

Now, most trucks still have a dip stick, but almost no cars do so a lift is required to refill and check level, or with Mopar/Mercedes, the tube is present, but no dipstick so you will need a dealer only dipstick for this. (another area the manufacturers want to condition all owners to do NO self maintenance and rely totally on the dealer)