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How do I know if I have a limited rear end? Do I need about 3 quarts of 75w140? What gasket maker do i use, I found Permatex gear old maker #81182? Found this seems helpful,
19 is open. There should be another tag on the diff. One says oil weight, the other has ratio and ring gear size. 355 88 on mine. A limited lsip would be 3L55.
You can also wait until you get the cover off. You can tell by what's inside. There's also the wheel spinning test.
Sorry trying to understand. Is open diff. another word for positraction, where both wheels spin at the same time? I was always told to add 2oz of a friction modifier to a possi.is that still the case?
I know it calls for 75/140. That is pretty heavy oil for a truck with such low trailering capacity and GVW. Both my 9.75" are on 75/90 now with LSD additive.
My dually has that heavy of oil for reference.
Yours is an open diff, no need for additive unless you want a lighter wallet.
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Door tag says axle 19. So I have a positrack? Diff. tag says 75w140. 3 55 88. Do I need to add 2oz of friction modifier?
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rear end fluid change due2001 ford f150.