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Old Nov 22, 2006 | 10:05 AM
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fill hole

Hi, ok I've read a lot and the one thing I can't find or maybe I missed it is where is the fill hole on the differential of a 1997 F150 XLT 4x2? I've read all about the friction modifier and that seems to be my problem but I can't find a way to add any. When I accelerate I get a slight shudder until I get to about 1000 RPM then it quits and runs fine. Obviously I'm not a mechanic and know very little about newer trucks so any help would be greatly appreciated. Thank you.
 
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Old Nov 22, 2006 | 10:12 AM
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I do believe my fill hole is on the front of the diff, and you need a 1/2 ratchet to get it open. Friction modifier can be bought directly from ford.
 
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Old Nov 22, 2006 | 11:36 AM
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Ok I'll go out again after it quits raining here and the tide recedes out of the yard. I don't remember seeing any kind of nut anywhere and my Brother in Law didn't remember seeing any either and that was what had me stumped but I will check again. Thanks my friend.
 
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Old Nov 22, 2006 | 11:50 AM
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It's on the front left, you will need a 3/8 ratchet and small extention to remove the plug. Extention just makes it easier.
 
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Old Nov 22, 2006 | 12:41 PM
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Ok thanks again guys I think I will brave the rain and go out and look again.


Just got back in and found it hidden back in there ao now I can take the cover off, drain it, clean it and refill. Thanks a million guys great site.
 

Last edited by spud55; Nov 22, 2006 at 12:49 PM.
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