have an 08 F 150 4X4 with 86K miles and haven't changed the trans fluid, just flushes by the dealership .....

changed the transfer case tho' about a year ago with the updated fluid for that.

When the trans fluid is is flushed does that flush the transfer case too ??

do you experienced guys respect the transmission flushes ?

sincerely and thanks

 

No. Totally separate.

Not if they use a flushing chemical. Doing a fluid exchange with a machine is the best way to change the trans fluid. Dropping the pan only gets about 1/3 of the old fluid out.

 

Mechanics I talk with say don't change your tranny fluid if your not having problems. Same with diff fluids, also. Check the levels periodically, but no need to change it, otherwise.

 

The mechanics that you talk with are either trying to get themselves a trans rebuild job, or they are incompetent, or both.

 

If you'd like a simple way to change the fluid, this is what I've done.

I had bought a Mity Vac for different fluid changes where access was tighter or they were the bullcrap "lifetime fluids" and you had to extract to even change it.

I have used it on my 2004 F150 and changed the trans fluid in about 25-30 minutes. I have done a pan drop twice over the years previously, so the fluid has been changed before as well as the filter. I even had installed a Uhual style pan with a drain plug.

I like the extractor method because there's no mess and makes it super quick to change the fluid. You only get what's in the pan, but if you change the fluid a few times over a period of time, you likely will get more and more of the fluid out. It's the same as a pan drop in terms of what you get for fluid.

I have a video I made on the extractor and show myself changing the transfluid on the truck.

 

No fluid lasts "the lifetime of the car." You're coming up on 100K. Set up an appointment to have the fluid changed.
Next time I pull a trans oil pan, I'm putting a drain plug in it. That way I can access the valve body or at least pull a partial drain and fill on the transmission.

 

I've installed drain plugs in several trans pans using the kit such as the ones available in the "Help" section of auto parts stores. They came with nylon washers that will leak. I bought oil drain plug washers that were metal with a rubber o-ring in the center available at the same stores. If you use those washers, the drain plugs won't leak.