Differential fluid change - Additive?
Senior User
Joined: Oct 2006
Posts: 332
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From: SE of Bennett Colorado
An old thread I know, but at least I used search! 
I'm about to do a rear diff fluid change on a 89 F250, 4x4, with diff tagged as 4L10 10 2 8H13 (4:10 limited Slip?)
I got 75-90 oil to put in it (it's just a farm truck, no synthetic required).
Just be certain, since I have limited slip I need to go back to 'the store' and get friction additive??
I'm about to do a rear diff fluid change on a 89 F250, 4x4, with diff tagged as 4L10 10 2 8H13 (4:10 limited Slip?)
I got 75-90 oil to put in it (it's just a farm truck, no synthetic required).
Just be certain, since I have limited slip I need to go back to 'the store' and get friction additive??
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