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Switched to synthetic gear oil in my 69 Mustang, now I get it
Ran 30 weight in the rear diff for 15 years because that's what my dad swore by, but after a 90 degree day in Phoenix the whine got so loud I tried Valvoline synthetic 75W-140, and the trans shifted smoother than a new car, so what do you guys run in your older differentials?
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reese_lane291mo ago
You ran 30 weight gear oil in a diff for 15 years and it didn't grenade on you first?
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