Change Rear Differential Fluid
#1
Change Rear Differential Fluid
Hello,
My 97 F150, 4x4, 4R70W, 105K miles runs great. I just purchased a 4000 lb camping trailer and am wondering, should I change out the fluid that's in there? I've read where it should be done at 100K and also that it's good for the life of the vehicle, as long as it (diff.) hasn't been under water, which mine hasn't. What do you guys think?
Thanks,
KC
My 97 F150, 4x4, 4R70W, 105K miles runs great. I just purchased a 4000 lb camping trailer and am wondering, should I change out the fluid that's in there? I've read where it should be done at 100K and also that it's good for the life of the vehicle, as long as it (diff.) hasn't been under water, which mine hasn't. What do you guys think?
Thanks,
KC
#2
#5
#7
I was looking at using a cheap Wal-mart brand called Super Tech, 75w140 full synthetic because it cost $10/qt. Mobil 1 wanted $17/qt. I've been reading these forums and have heard that Royal Purple is the stuff to use. I decided to look online for Royal Purple to see where I can get it here in Jerkwater. I was shocked to find a place online that is selling the RP 75W140 for $9.99/qt!!!!
Going to buy it as soon as I get home (work firewall won't let me). Can you believe that deal? :-)
Going to buy it as soon as I get home (work firewall won't let me). Can you believe that deal? :-)
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#9
Middle of project... fluid is out, pan is back on, but that fraking fill nut won't break free! I've been spraying it w/ WD-40 and using a 3/8" extension, but it feels like I'm going to strip the square nut out. Is there a secret or do I need a special tool for this? I thought a 3/8 extension is what everyone used...
#10
#11
Whew! Found a torch and 2 hours later that sucker finally broke free. Why the frak would Ford put that nut in there so tight? Holy crap! I gave hit one last blow with the hammer and it barely moved! I kept at it and little by little it loosened up... wow! I was thinking this project was gonna take maybe an hour.... ended up being closer to 4. But... no leaks and saved myself some cash!
#13
For just this reason, I have heard it recomended more than once to make sure you can loosen the fill plug before you drain the old fluid. That way if you can't get the fill plug loose, you still have fluid in there and can drive the vehicle if necessary, while you consider your options. Same idea applies to transfer case and manual transmission fluid changes.
#14
For just this reason, I have heard it recomended more than once to make sure you can loosen the fill plug before you drain the old fluid. That way if you can't get the fill plug loose, you still have fluid in there and can drive the vehicle if necessary, while you consider your options. Same idea applies to transfer case and manual transmission fluid changes.
#15
Just make sure you heed the advice... loosen the plug BEFORE you drain! If only I would learn!