Rear Diff oil question
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Senior User
Joined: Oct 2004
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From: Virginia
Rear Diff oil question
Owners manual calls for 80W 90 for the rear diff in my B4000. I want to replace the fluid with synthetic but none of the stores around here seem to carry a synthetic 80w90 gear oil. I found a synthetic blend, but not a "full" synthetic. Would something like Royal Purple or Mobil 1 75w90 be acceptable or would i risk damaging something? I cant see how it would make that much of a difference but I'm no expert.
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Joined: Jan 2003
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Originally Posted by ctboyle03
Owners manual calls for 80W 90 for the rear diff in my B4000. I want to replace the fluid with synthetic but none of the stores around here seem to carry a synthetic 80w90 gear oil. I found a synthetic blend, but not a "full" synthetic. Would something like Royal Purple or Mobil 1 75w90 be acceptable or would i risk damaging something? I cant see how it would make that much of a difference but I'm no expert.
This is a pretty good article I just found:
http://www.valvoline.com/carcare/art...=ccr20040601ov
