Rear Diff Question
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Senior User
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From: Middle Geogia
Rear Diff Question
I just bought a used 2000 F250 7.3L SWB. I was reading the manual last night and it stated that some of the Ford rear diffs came with synthetic oil installed from the factory, and that it should not be touched. How can I tell if I have such a diff?
Thanks.
Thanks.
Last edited by HDMustF250; Jan 14, 2004 at 07:39 AM.
Post Fiend
Joined: Jan 2002
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From: USA
Chk the tag on the diff
it will say 75w-140 synthetic
depending on whether you have a ls unit
it will have another tag that reads
3L 73 or 4L10 or 4Lxx
The L stands for limited slip
When changing the fluid in the rear dif ,you add a friction modifier to help the clutch packs not be to grabby.
You can change the fluid as often as you like just add the proper amount of additive .
This will actually keep the vss sensor clean ,which will cause less problems in the future.
Rich
it will say 75w-140 synthetic
depending on whether you have a ls unit
it will have another tag that reads
3L 73 or 4L10 or 4Lxx
The L stands for limited slip
When changing the fluid in the rear dif ,you add a friction modifier to help the clutch packs not be to grabby.
You can change the fluid as often as you like just add the proper amount of additive .
This will actually keep the vss sensor clean ,which will cause less problems in the future.
Rich
Freshman User
Joined: Aug 2003
Posts: 38
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From: CA Desert
I replaced my "hohum stock"diff covers with polished aluminum covers and used Redline synthetic. Worked well for me.
"Ford rear diffs came with synthetic oil installed from the factory,
and that it should not be touched."
My question would be, why not? Anyway, I'm happy with the setup I have now.
RedCrewCab
"Ford rear diffs came with synthetic oil installed from the factory,
and that it should not be touched."
My question would be, why not? Anyway, I'm happy with the setup I have now.
RedCrewCab
Senior User
Joined: Sep 2003
Posts: 185
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Originally posted by NoMo
The Sterling axle on all single rear wheel trucks requires synthetic fluid. The Dana axles (front on a 4x4 or rear on a dually) do not require synthetic fluid.
The Sterling axle on all single rear wheel trucks requires synthetic fluid. The Dana axles (front on a 4x4 or rear on a dually) do not require synthetic fluid.
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Post Fiend
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From: USA
well it would be real stiff in the winter like they used to be at -30 F
Its lighter in weight to help with mpg's problably
Just like our 6 speeds use ATF now!
less resistance
Rich
Its lighter in weight to help with mpg's problably
Just like our 6 speeds use ATF now!
less resistance
Rich
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Thread Starter
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Senior User
Joined: Jan 2004
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From: Middle Geogia
Thanks I was wondering why the 6 speeds used ATF.
I have checked all of the places for a code for the rear diff. No luck. It seems to run at 60 mph at 1750 rpms. Which is a little higher than the mathematical equation for 3.73 and a little lower than 4.10. Any ideas?
I have checked all of the places for a code for the rear diff. No luck. It seems to run at 60 mph at 1750 rpms. Which is a little higher than the mathematical equation for 3.73 and a little lower than 4.10. Any ideas?