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1996 XLT Rear Diff - Best Fluid

Discussion in 'Explorer & Ranger Transmissions, Transfer Cases, &' started by SCB2525, May 6, 2009.

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    1. SCB2525

      SCB2525 Member

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      City, State:
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      Year and Model:
      1996 XLT
      What is the proper fluid? I have 2 quarts of Redline 75W-90 without limited slip additive. How do I know I have a limited slip diff? If I do, where should I get the additive?
       
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    3. IZwack

      IZwack Moderator Emeritus

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      That weight should work provided you're not towing heavy stuff. Additives can be purchased from the dealer or sometimes auto parts stores - it usually costs around $5 I think.

      You can tell if you have a limited slip if you have a "D" in the axle code in the sticker located on the side of the driver's door.

      [​IMG]
       
    4. SCB2525

      SCB2525 Member

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      Well what does it call for? This truck doesn't tow, but if a 75w-140 would significantly cut down on vibration or protect that much better, I may go for that.
       
    5. SCB2525

      SCB2525 Member

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      I've looked around and there's conflicts as to what people say to use. Some say 75/90 is fine but others say Ford updated their recommendation to 75/140 due to wear issues. Truck has 177k and I don't know if the fluid has ever been changed. Still, its given no troubles or noises but I just want to get some of the deferred maintenance up to snuff. Trans was rebuilt about 20k ago and the transfer case fluid changed about the same time with Redline High Temp ATF. Driveshaft splines were greased shortly after it became my vehicle and its sounding like it needs it again. I think I may use Amsoil open gear grease to try and keep it lubed longer.

      When I do the differential should I get the gasket off Rock Auto or just use RTV?
       
      Last edited: May 6, 2009
    6. IZwack

      IZwack Moderator Emeritus

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      Either really - I personally just use RTV. But some people will argue that a gasket with RTV on both sides is much better.
       
    7. techieman33

      techieman33 Explorer Addict

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      the 75/90 should be fine, as long as it's good quality oil. I'm running amsoil 75/110 in mine with no troubles, that what the dealer reccomended. And my axle probably sees a whole lot more stain than yours does.
       
    8. SCB2525

      SCB2525 Member

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      I'd say Redline is quality. If 75/90 is what's in there now, I don't think it'd be bad to replace it in kind. Also, anyone ever utilize a magnet? I wouldn't think putting one inside would be very good, but how about throwing a hard drive magnet on the outside near the bottom? I just don't know how effective that would be.

      What is the capacity on these? Should I expect to be good with 2 quarts?

      I really wonder if its ever been changed. If it never has been, you think I stand to bump up my MPG?
       
    9. HahnsB2

      HahnsB2 Active Member

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      They take about 2.5 quarts, so buy 3.
       
    10. RickMar

      RickMar Active Member

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    11. SCB2525

      SCB2525 Member

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      I checked the code this morning but it didn't match the same format as the one above. The axle code was I believe 45, which according to a rundown I found in another thread, means I don't have a LS diff.

      If I have to get a third quart, I'm on the fence as to whether I might as well go all 75/140. My problem is I got this fluid online several months ago and I'm not sure what I'd do with it. My nearest Redline dealer is like 20 miles away. I wonder if they'd swap the 2 75/90s for 75/140s as long as I got a third 75/140 and a few quarts of ATF for when I plan to change the fluid in the M5OD in my dad's '91 F-150. Otherwise I might be willing to sell these two quarts of 75/90 if anyone's interested.
       
    12. nitro71

      nitro71 Well-Known Member

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      D or L is limited slip.

      http://www.explorerforum.com/ntrprize/Axle.htm

      If you off road it put whatever is cheap in as you'll probably want to replace it occasionally anyways. My blazer had water getting in the diffs once in a while.
       
    13. techieman33

      techieman33 Explorer Addict

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      If your 2wd that 2 quarts would be enough to fill up the front diff.
       
    14. RickMar

      RickMar Active Member

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      Axle Ratio and Transmission Codes — Ranger, Explorer
      Axle Ratio and Transmission Codes — Ranger, Explorer


      1996 Explorer
      CODE -Type -RATIO
      41 Conventional 3.27
      45 Conventional 3.55
      D4 Limited Slip 3.73
      46 Conventional 3.73
      D1 Limited Slip 3.27
      42 Conventional 4.10
      D2 Limited Slip 4.10
      All above have 3200 Pound Capacity

      Rear Axle 3
      Ford Conventional and Traction-Lok® 8.8 Inch
      Approximate Capacities 5.5 Pt. (2.75 Quarts)

      3 Fill to 1/4 inch to 9/16 inch below bottom of fill hole
      I hope this helps.

      Rick
       
    15. IZwack

      IZwack Moderator Emeritus

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      ^-- those numbers only apply to Explorers, not Rangers. Just look here for the entire list: http://www.explorerforum.com/ntrprize/Axle.htm
       
    16. SCB2525

      SCB2525 Member

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      Lots of good info, thanks guys.

      Does anyone know what is OE in a 3:55 conventional diff? 75/90 or 75/140?

      Also, anyone know if an aftermarket cover is available with a drain plug? Relatively cheap that is? I'd probably change it a lot more often if it was that easy.
       
    17. RickMar

      RickMar Active Member

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      Rear Axle Conventional (5.5 - 5.8 pts.) 80W90 Axle Lubricant

      Ford Part #XY-90-QL
      Ford Specification ESP-M2C154-A
      Ford Part Name -Premium Rear Axle Lubricant
      I hope this helps.
      Rick
       
    18. jlsparky7

      jlsparky7 Well-Known Member

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      Redline is good stuff and that weight will be fine. Check my signature for a differential flush how to video. With a 100% synthetic gear oil you DO NOT need the additive unless there is vibrations after the fluid change.

      The best gear lube in my opinion is Amsoil.
       
    19. IZwack

      IZwack Moderator Emeritus

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      This isnt aimed to you jlsparky7, but I just wanted to add my personal experience with Amsoil gear oil:

      Last fall, I drained the shuttle van's rear axle's gear oil and refilled with Amsoil. After that, the van has had this hum at like 55 mph. When the Explorer is done and ready to be towed, I will flush the Amsoil out and see if Redline does any better. If that doesnt work, back to good ol' Mobil-1 (although expensive).
       
    20. SCB2525

      SCB2525 Member

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      Well I'm going to have to mix the Redline with a topper of Mobil-1 it seems, as the only Redline distributor in the area is only open M-F and I was busy all day. I need to get this done this weekend, so its going to be 2qts Redline and the rest M-1.

      Anyone think that wouldn't be OK?
       
    21. IZwack

      IZwack Moderator Emeritus

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      I'm sure it'll be okay.
       
    22. nitro71

      nitro71 Well-Known Member

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      Mix away.. You can mix motor oils at will. Can't see that gear lube is any different.
       
    23. SCB2525

      SCB2525 Member

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      If the differential cover listed by Advance Auto comes with a gasket (which it seems to looking at the picture of the same exact part on Rock Auto), I think I'm gonna get one. It's only $19 and the gasket is $5 anyway. I'll hit it with a couple coats of black high-temp.

      If I do that, I might as well go all the way and get new bolts too (I've inspected mine, they're not in good shape). Does anyone know what size they are?

      I know I keep coming back to this with new questions and I don't mean to pester but I just want to prepare as much as possible and do this right and once (that is until the fluid needs changing via mileage).
       
    24. SCB2525

      SCB2525 Member

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      So I changed the fluid with the aforementioned Redline/M-1 mix, used a gasket without RTV and slapped the old cover on after cleaning it inside and out (it wasn't that bad after all when cleaned). Then I painted the cover with some high-heat textured Rustoleum. The old fluid wasn't as bad as I thought it would be; someone must have changed it at some point. It was still definitely at the point of needing changing, it just wasn't "oh my god this is so deteriorated its sad" bad. I didn't know old gear oil stank so much.

      No leaks in the last few days I've checked so everything worked out. A new tank of gas will tell whether I gained any fuel economy as a result.

      Thanks a lot all!
       
    25. techieman33

      techieman33 Explorer Addict

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      My amsoil was nasty after maybe 10k miles, we're pretty sure it's from tearing up the L/S clutches, now how would that happen:scratch:





























      Oh wait I know:burnout::smoke:
       
    26. SCB2525

      SCB2525 Member

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      According to the last 2 fillups, I've gained a solid 2-3 MPG.
       

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