Differential Fluid
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New User
Joined: Feb 2004
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Differential Fluid
Why does Ford recommend a 75-140 Synthetic for the rear differential?
All the big truck shops around here use 75-90 when they service rigs, and will sell it to me for ~$2.50/quart if I bring my own container. Only a couple places stock the 75-140 and it's $15/quart as no-one usees it enough to carry in bulk.
If Peterbuilt, Kenworth etc recommend 75-90, why the 75-140 for Ford?
All the big truck shops around here use 75-90 when they service rigs, and will sell it to me for ~$2.50/quart if I bring my own container. Only a couple places stock the 75-140 and it's $15/quart as no-one usees it enough to carry in bulk.
If Peterbuilt, Kenworth etc recommend 75-90, why the 75-140 for Ford?
Fleet Mechanic
Joined: Dec 2002
Posts: 1,664
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I don't know why,someone said because of the torque on a small differently.
But I just changed mine and put Amsoil in at $12.99 a quart. But Wal Mart has it not,I've seen it for about $6.00.
Make sure you clear the vent tube and fitting for it at axle. Mine was getting plugged at fitting. Rust I believe. I reamed it clear with a small caliber gun barrel reamer. A guy blew his seals because of clogged vents.
Capt.
But I just changed mine and put Amsoil in at $12.99 a quart. But Wal Mart has it not,I've seen it for about $6.00.
Make sure you clear the vent tube and fitting for it at axle. Mine was getting plugged at fitting. Rust I believe. I reamed it clear with a small caliber gun barrel reamer. A guy blew his seals because of clogged vents.
Capt.
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Joined: Sep 2004
Posts: 17
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From: Australia
It is a LSD.
The clutches are very harsh on oil and if the oil breaks down the clutchs will do things you don't like & eventually die.
The 75w140 is GL-6 and a full synthetic oil, that is why it is expensive.
I think you'll find those other diffs are not LSD, but even if they are, they are in vehicles that will never be abused in the way some of the F250's are, (wheel spin, fast hard cornering).
The clutches are very harsh on oil and if the oil breaks down the clutchs will do things you don't like & eventually die.
The 75w140 is GL-6 and a full synthetic oil, that is why it is expensive.
I think you'll find those other diffs are not LSD, but even if they are, they are in vehicles that will never be abused in the way some of the F250's are, (wheel spin, fast hard cornering).
