- OP 🔹
- #21
Not sure but most likely. Go to the Lube Locker website they have pics as well.
This is what I installed.
This is what I installed.
Front diff fluid change
- OP 🔹 Trophyhunter01
- Start date
that photo looks like a common open diff. wheres all the clutch plates at ?
if you look at the first photo it appears to be a common front open diff. they must be just using the braking modules to direct power to the less traction wheel.
No, it's a limited slip diff. They look very similar to open diffs because you can't directly see the clutches.
The clutches are behind the side gears. Here's a pic.
well i stand corrected and good to know. it didnt appear there was enough room to have any plates in there
Dumb question...maybe.
Since these trucks are not turning anything in the front diff unless in 4x4, shouldn't that fluid last....almost forever?
Since these trucks are not turning anything in the front diff unless in 4x4, shouldn't that fluid last....almost forever?
- Jul 26, 2025
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- '25 F350 XLT Tremor 7.3 Guzziller Carbonized Grey
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Good question.
I think the affirmative to your scenario would be if the limited slip differential in question were an all-steel unit like the TorSen or the Eaton Detroit Truetrac.
But what's in our factory Super Duty Tremors is a clutch-style limited slip, and depending on how great a percentage the rig is in 4 X 4 (plowing, long rugged stages off highway involving a lot of steering) the greater amount of friction material shed in the fluid.
In rear-drive applications, any PosiTraction or TracLok clutch-type LS' suggested service is +/- 30,000 miles and this may involve some disassembly at the very least to mic clutch plates for wear in addition to a fluid swap + modifier.
I would MUCH rather have a Truetrac in the front of my truck for the sheer simplicity of it all. No wires, no air lines (lockers) just a near-miraculous limited slip design that is almost a "million-mile" unit.
It's unlikely that the fluid will get contaminated from use. Unless you use 4wd a LOT.
However, diff have breathers and exchange air.
As the temp changes, it will draw in air/moisture and that will contaminate the fluid over time.
So even if you don't use the 4wd, it's still a good idea to change the fluid at some point.
It doesn't turn with a load on it, but it does turn. The minimal friction from the transfer case gears and hubs does spin the front.
I have a 2021 tremor, with the 7.3 gas. Would I have the Dana 60 front end, and the m275 rear end? Do you happen to know for sure? I'm trying to find the correct gaskets, and fluid for when I do a fluid change in the upcoming weeks.
I’d hop down there and look, there should be some info on the axle near the pumpkin or if you shoot a photo of the covers someone on here can probably chime in.
- Jul 26, 2025
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I believe the '24s and the 25+ Tremors have the M235 (235mm = 9.75") front axle. These are easier to spin (more fuel efficiency by, what? .0235 MPG? - I jest) but are alledged to have Dana 60-sized axle flanges/U-joints/whatever else may be involved at the axle ends).
The rear in the F250/350 Tremors is the 11.6" Sterling.
The rear in the F250/350 Tremors is the 11.6" Sterling.
Watching that video it looks like the Superduty Tremor has a Crisco Locker. I really liked the Torsen front locker in my F-150 Tremor. Too bad it's not robust enough for a SD truck. The Raptor R lost the front Torsen as well, I'm guessing for the extra power it has.
Thanks.
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- OP 🔹
- #35
That is not a D60 with all those bolts. That looks like a rear differential to me. There are a couple of good threads on here about what differential is in what year model, use the search tool. If that is the rear just remove the bottom bolt and drain the fluid, if it looks good just replace and don’t remove the cover.
That is the rear, sorry if I made it confusing. I think it's the M275. Thanks
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- Sep 20, 2023
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@Nick@ApolloOff-Road summed it up best:
"All Tremors have the Dana M275 rear axle in them. Regardless if they are F-250 or F-350.
F-250 Non-Tremor Non-HD Tow Package has the Sterling Axle.
F-250 Tremor has the Dana M275.
F-250 HD Tow Package has the Dana M275.
F-350 SRW has the Dana M275.
F-350 DRW has the Dana M300.
All front axles are Dana 60. And Tremors have a front limited slip."
So you have a Dana 60 and Dana M275 rear.
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Thanks, again.
