When I bought my truck it had 122,697 miles on it, had the whole truck gone through all COPS replaced, plugs, coil boots, fuel filter, oil, filter changed.. The basics.. I'm now at 155k in 4 years, i do the oil and filter changes myself But you guys know a lot more then me... Is it time anything new? Maintenance wise that is... Ha thanks!!!

 

Diff and trans. Might be time to check the wheel bearings and repack them or replace any seals that are showing wear.

 

I'm probably going to be doing that soon, should I replace the trans filter while in there? My magnetic plug on the diff had a good amount of build up which indicates its never been changed. Do these rear diffs require a limited slip additive? Thank you!

 

Not sure on your truck about the additive in the diff. As far as the trans goes though, if I take off the pan...I change the filter. Just a good practice. I'm not going to get into the flushing of the trans because of the fact people are evenly against and for it. It's a personal choice I guess.

 

yeah thats a whole gremlin we wont get into ha. but regardless I'll flush the diff.

 

What is your axle code on your VIN tag? That will tell you if you have limited slip or not (H9 (3.55) and B6 (3.73) are LS codes).
If you have limited slip, you need need to use the Ford Additive, even if the fluid your using says it has it in there, these OEM LS are picky and most that don't use it end up having to go back and do it later since the rear end chatters.


As for the transmission, my personal preference is to drop the pan and change the filter and then just top it off (around 4-5 qts). While the pan is off, install a drain plug so you can drain the pan easily and do 2-3 partial fluid changes to get mostly new fluid in there.


I followed this how to when I did my drain plug (it is an 11th gen, but same pan).

 

my man just what I was looking for! I'll check tomorrow !

 

Technically plugs are spec'd at 100k. But please change well before that. I wouldn't recommend going more than 50-60k on a set.

 

Transfer case if you have 4x4. Transmission flush is the way to go. Just did one myself. Very easy. Drop the pan. Clean it. Replace filter. Put the pan back on. Ad 5 quarts of ATF. Disconnect the upper return line after the fluid comes from the little radiator up front. Drain into a pan after putting a rubber hose on the return line so you can direct it down to your pan. Now start the truck and it will come out the return hose. It helps to have a helper who can start and stop your truck while you watch it drain. Ad a few quarts. Run it and drain a few. Ad a few more. Do this by starting and stopping the motor a few times. Or pay but why leave all that dirty fluid in there by only changing a little. Lube ball joints and steering linkage also.

 

Change the trans fluid YES but Ford does not recommend that you change the differential unless you have reason to believe that water has gotten into it. A lot of people think you should change it regardless of what Ford says and it that is what you want to do; go for it. However, make sure you put the proper fluid and friction modifier in the differential. Failure to do so will trash your differential.

I would change the fuel filter again as these should be changed about every 25 to 30 thousand miles. Also the air filter. I would also recommend changing the PCV valve and cleaning the MAF sensor. Other good maintenance would be to flush out the brake lines and add fresh fluid. While you are under the hood, inspect vacuum lines, heater hoses, radiator hoses, fan belt, and replace any that are deteriorating. Inspect the fan clutch and make sure is it not leaking oil or wobbling around. If you have not changed your coolant in the last 4 years, it might be a good time to do this also. All of this is inexpensive and more less easy to accomplish.