im flushing out my diff today and puting some new fluids in it. what kind of fluids do i get though?

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2001 XLT 4x4 V6 4.0L auto
SAS'd D44 and 8.8. dual lockers, 38s, 12 bolt h1's, some other odds and ends

75w140 synth oil

if you run full synthetic gear oil, then you don't need the friction modifier, but if you run a conventional gear oil then you will need friction modifier

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alright thx man appreciate all ur advice

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2001 XLT 4x4 V6 4.0L auto
SAS'd D44 and 8.8. dual lockers, 38s, 12 bolt h1's, some other odds and ends

Royal Purple is what I put into mine I think it took 2 1/2 bottles to fill I was over a year ago so maybe wrong

Just use the fill hole on the driver side that is toward the front of the truck. Make sure truck is on level ground. Fill with fluid till it starts to pour out the hole

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Here is a picture to show where to fill the axle

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I know that my 8.8 requires 75W90 if I'm using synthetic. Also, you don't need a friction modifier since you have an open diff.

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2006 Ford Ranger Sport 4.0 2WD on 32x11.50R15s
-3" Doetsch Spindle Lift


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Only L/S needs friction modifier right?

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Yup. I'm not sure if you need it with a locker, but yeah open diff doesn't need it, L/S does.

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2006 Ford Ranger Sport 4.0 2WD on 32x11.50R15s
-3" Doetsch Spindle Lift


Using the forum:
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Creating a signature (do this before asking any questions)
Upload an Avatar (image of your Ranger)
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Okay I used the 75140 synthetic royal purple

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Be careful with some synthetic oils. Some don't contain enough friction modifier and can cause the l/s clutches to chatter. You need it for l/s diffs but not open or locker diffs with the exception of the Auburn ECTED. Not sure if it needs it since it is both a locker and l/s.

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2010 Magnetic Grey Metallic Toyota Tacoma Double Cab TRD offroad 4wd

what size bit do i need to take out the filler cap screw?

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2001 XLT 4x4 V6 4.0L auto
SAS'd D44 and 8.8. dual lockers, 38s, 12 bolt h1's, some other odds and ends

Just a 3/8inch drive.

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2010 Magnetic Grey Metallic Toyota Tacoma Double Cab TRD offroad 4wd

Mine was a 3/8 square I just used a ratchet with extension on there and pulled it out

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ok cool so i dont need to go and buy a bit? just the 3/8 inch drive head?
and tom said his 8.8 used 75w 90....is 75w 140 gunna work in mine?

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2001 XLT 4x4 V6 4.0L auto
SAS'd D44 and 8.8. dual lockers, 38s, 12 bolt h1's, some other odds and ends

how do you know if you have a l/s differential

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).