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  #1  
Old 02-13-2012, 08:13 PM
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rear diff oil...

anybody got a how to article on changing rear diff oil... 2000 f150 stock.
how many quarts of oil should I purchase. 3??
wanna try this myself this spring. cold use a pic or 2... thanks!!!
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  #2  
Old 02-13-2012, 08:28 PM
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just to let you know this was on the first page...

2001 screw rear differential fluid change
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  #3  
Old 02-13-2012, 08:36 PM
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Location: Bear, Delaware
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David C. Shoun dcshoun
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Simple. Go to the dealer or auto parts store and get 3 quarts (70-140?) gear oil. If you have a Limited Slip Diff. (check your axle code on door jam) then one small bottle of Friction Modifier is required.

Put drain tub under rear diff. cover area.... start loosening cover bolts. I do top to bottom. leave the bolts in... but loose. when all are loose, separate the bottom of the cover from the differential/gasket to let oil begin to drain out. As it gets slower continue loosening lower to top bolts to create more of a gap to let the oil flow out. When oil flow is minimized..... completely take out bolts and remove the cover. TAKE CARE AS NOT TO DAMAGE THE AXLE TAGS ATTACHED TO THE BOLTS. These need to be preserved!!!!!

Clean Differential cover of all old gasket / RTV sealant as well as the diff. surface where the cover will meet. Apply a good bead of new RTV sealant to the clean face of the rear going completely around (a circle) the bolt holes. Let stand till tacky... re-install diff. cover and LIGHTLY install bolts till RTV slightly squeezes out. wait a while... slowly continue to re-tighten bolts... paying attention as not to damage the axle tags as the bolts are finally tightened.... they will want to swing around as the bolt turns and get crimped up.

Easier done than written. Hope it helps
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Last edited by Red02FX4; 02-13-2012 at 08:38 PM.
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  #4  
Old 02-13-2012, 08:44 PM
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David C. Shoun dcshoun
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Quote:
Originally Posted by JPACK View Post
just to let you know this was on the first page...

2001 screw rear differential fluid change
Guess I shoulda typed.... get a HAYNES/CHILTON MANUAL first

you posted that link while I typed instructions I thought we were friends


SEARCH BUTTONS are our elves
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  #5  
Old 02-13-2012, 08:48 PM
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lol
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  #6  
Old 02-13-2012, 08:52 PM
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It's no joke about the friction modifier, make sure you add it.
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  #7  
Old 02-14-2012, 07:40 AM
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thanks I poked around here a bit then figured I'd just ask. great info. weather warms up. i'll give it a whirl.
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  #8  
Old 02-14-2012, 09:22 AM
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Quote:
Originally Posted by Red02FX4 View Post

SEARCH BUTTONS are our elves
Damn, I guess they can be are enemies as well. Specially when your feeling generous.
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  #9  
Old 02-14-2012, 04:14 PM
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David C. Shoun dcshoun
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Originally Posted by jbrew View Post
Damn, I guess they can be are enemies as well. Specially when your feeling generous.
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  #10  
Old 02-14-2012, 08:58 PM
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Just did it the other day... it's easy, but could get a little messy. I used Royal Purple, it already has the friction modifer added in. That link is my video. I'm no superstar mechanic and if I can do it anyone can. Good luck!
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  #11  
Old 02-15-2012, 01:10 AM
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Thanks to all of you guys, I pulled the rear cover today and drained my rear diff today. I pulled the spare tire out of the way, it needed a clean up and check anyway.

My diff cover was horrible rusty with 147K. I wire brushed it with a drill attachment after hosing it down with wd40. Cleaned it up with engine cleaner and hot soap water and then brakekleen to dry. I found a permatex rust inhibitor product I had never used in the garage, so I brushed it on and it is setting up in my garage overnight. It claims to provide a good primed surface for painting, guess I will see. I have some black gloss spray on undercarriage type coating to go on it tomorrow.

I bought two small containers of the friction modifier from ford to mix into 3 quarts of valvaline full syn 75-140 gear lube. I do not have a gasket, going to have to find some black rtv type sealer.

The best part today was using the air drive rachet to remove the bolts, feels like cheating. Thanks again for the great info, wish me luck for no leaks,lol.
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  #12  
Old 02-15-2012, 01:15 AM
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David C. Shoun dcshoun
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When I went to my local dealer about 2 months ago to get the gear oil and modifier, they said I would need 3 quarts oil and 1 bottle of modifier.... which is what I put in.
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  #13  
Old 02-15-2012, 06:41 PM
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Thanks Red, the dealer told me 2 bottles of the friction modifier was what I needed. I remember reading here the someone else was having some issues with their LS diff, and it took a 2nd bottle to get their problem cleared up?? I will probably go ahead and put in the 2 bottles in. Any harm with too much friction modifier? And what does the stuff do....why is it so important for the LS diff? I am about to put the cover back on today after getting the black underbody coating stuff to set up. The bolts were a mess of rust, so I primed and painted them with some silver hear paint I had.
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  #14  
Old 02-15-2012, 07:04 PM
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Friction modifer makes the clutches slip so you can go around a corner and not chatter or shudder. I suppose to much modifer would just make the lsd not work that well for offroad purposes or something.
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  #15  
Old 02-15-2012, 09:30 PM
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I asked both the separate companys I bought my traction locks from and both recommended 1 bottle of ford friction modifier so that's what I been running in my mach I and my truck. The one in the Mach I is different then our trucks but both have been working with out any issues..
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Old 02-15-2012, 09:30 PM


 
 
 
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