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Spartan Locker

Discussion in 'Modified 2002 - 2005 Explorers' started by skysthelymyt, April 8, 2012.

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    1. skysthelymyt

      skysthelymyt Active Member

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      Well, after reading a lot of threads about different lockers I decided to go with a US Standard Gear Spartan Locker. Like any lunchbox style locker, it goes in the place of the spider gears. The install of the locker was very easy. I used the thread http://www.explorerforum.com/forums/showthread.php?t=318076 to help during install.
      The locker came in a nice box.

      [​IMG]

      [​IMG]

      [​IMG]

      It came with a set of instructions on how to install the locker inside the open carrier. The Spartan Locker DID NOT have to be modified in any way to fit the ford 8.8 IRS. The axle spacers had the correct inside diameter.

      [​IMG]

      [​IMG]

      Not the best way to measure the inside diameter but hey, it worked.
      Getting the diff out wasn't all that hard. I had a buddy with me helping getting it out.

      I cleaned the inside of the diff with break cleaner (not perfect) but I got the major stuff off.

      [​IMG]

      Btw, the tolerance for the Spartan Locker is between .145-.170 inches. That was measured with feeler gauges. Do not use thrust washers for this locker. It specifically states not to use them. So make sure you get them out when you remove the spider gears.
      After install:

      [​IMG]

      After you get everything back together, go have some fun!!!

      [​IMG]

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      It works excellent. NO problems. I don't hardly hear it on the road. You can hear it when making sharp turns in a parking lot. I used Lucas 85w-140 gear oil. And if you have a noisy rear end, this gear oil will help lessen that noise. It is about 10$ a bottle and you need to get two. (Ford manual says to put 1.7 quarts in rear axle)

      Any questions, feel free to ask.
       
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    3. Wills05xlt4x4

      Wills05xlt4x4 Elite Explorer

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      Great write up. Can't wait to regear and lock mine this summer
       
    4. Ronin8002

      Ronin8002 Elite Explorer

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      Nice work and great writeup. The 8.8 Spartan came out a while after i did the aussi so i wondered how it might have worked. Glad to see it's a direct fit. Hope you make good use of the added traction!
       
    5. Blee1099

      Blee1099 Evil Asian Moderator Emeritus EF Vendor

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      One good thing about the Spartan is that its made by Yukon gears and it has a hardened shaft already..
       
    6. rangermidtn

      rangermidtn Elite Explorer

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      Nice! How much did it cost?
       
    7. Wills05xlt4x4

      Wills05xlt4x4 Elite Explorer

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    8. rangermidtn

      rangermidtn Elite Explorer

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    9. skysthelymyt

      skysthelymyt Active Member

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    10. Mr. Truckles

      Mr. Truckles Elite Explorer

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      Great deal! This is exactly what the 3rd gens need. With a super rigid frame and IRS it rlly doesn't take much to lift a wheel even with the sway bars disconnected.
       
    11. Ronin8002

      Ronin8002 Elite Explorer

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      I've updated the Aussie Locker install thread in the stickies to mention that the Spartan locker is a direct fit install. Hopefully that will encourage more people to start doing this now.
       
    12. Triton8273

      Triton8273 B

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      Should it still be a direct fit if I do a 4.10 or 4.56 swap?

      Still trying to understand how gearing works.
       
    13. Ronin8002

      Ronin8002 Elite Explorer

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      Yep. The ring and pinion gears change but the carrier and CV axles stay the same. Since those two things (carrier/axles) are the factors that affect fitment for our diffs then you should not have any issue fitting the locker when you do a gear swap.

      However, with 4.56 gears you will probably have to grind the edge off one of the ring gear teeth to allow the cross pin to be inserted into the carrier. As I understand it, this is done frequently with all the higher ratio gears and it has no impact on anything.
       
    14. skysthelymyt

      skysthelymyt Active Member

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      Thanks.
      I hope so too.
       
    15. Wills05xlt4x4

      Wills05xlt4x4 Elite Explorer

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      That is something that would void a warranty without a noched pin... Even though they are weaker...
      Im going 4.56 and I'm most likely get the noched pin allthough they don't have but a yr or so warranty on the ring and pinion...
       
    16. Ronin8002

      Ronin8002 Elite Explorer

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      I don't much about the full carrier lockers like the Ox, but I would think that with the way they work there would be less of a problem running a notched pin than with a lunchbox...maybe the stress on the pin is the same between the two types though...don't know.

      Didn't think about the warranty thing, good point.
       
    17. rangermidtn

      rangermidtn Elite Explorer

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      I ordered mine today! Can not wait to get it.
       
    18. Ronin8002

      Ronin8002 Elite Explorer

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      actually after looking at some pics it looks like all the full case lockers just bolt right to the ring gear, there's no cross pin because it that kind doesn't need one.

      So I guess the whole notched cross pin thing vs notching the gear tooth doesn't really come into play unless you're doing a lunchbox locker or spider gears
       
    19. Ronin8002

      Ronin8002 Elite Explorer

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      sweet!
       
    20. xplorerguru

      xplorerguru Active Member

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      This is AWESOME!!!
       
    21. skysthelymyt

      skysthelymyt Active Member

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      It's awesome. I have enjoyed having it so far this week. I can't hear it with the radio on. With the windows down and radio off while in a tight turn I can hear it barely. If you are very light on the pedal from a stop into a turn, it will unlock and won't make any noticeable noise. It was worth every penny in my opinion.
       
    22. Tarpman

      Tarpman Active Member

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      I'm getting ready to have my rear diff rebuilt. I currently have 3.55 ratio. will this work for me? Will it bolt right in, or do I have to go with 3.73 or higher numerically (lower gears)? I was thinking of going lower anyway but i get almost 20 mpg on highway and 95% or more of my driving is commuting. I'M running 265/70/16 but going back to 265/75/16. To do all of this do I have to get a different differential?
       
    23. Ronin8002

      Ronin8002 Elite Explorer

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      As long as your current differential is open and not limited slip it will bolt right in. The gears have no impact unless you go 4.56 or higher, in which case you'll have cross pin clearance difficulties.
       
    24. skysthelymyt

      skysthelymyt Active Member

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      Agreed. I have 3.55 now and it was not a problem to put it in. The Ford 8.8 does not have a carrier break so as long as you have an open diff then it can be done. Since you are only going with 3.73 then you will not have a problem.
       
    25. Tarpman

      Tarpman Active Member

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      Thanks for quick response guys. Is going from 3.55 to 3.73 big difference. Right now engine is at 1800 rpms at 70 MPH. A friend who does the same thing Btf does (off road fab) says don't change because my mileage will suffer, and is it hard to drive on the street with a locker. Never done it. How about drivrtrain ware? I'll be on the street mostly just thought it would be nice to have a locker when I needed it. Had a LSD on a couple other trucks and it wasn't that great but they were Ford LSDs maybe that makes a difference, huh. Need good advice before I spend the money.
       
    26. Ronin8002

      Ronin8002 Elite Explorer

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      no, going to 3.73 from 3.55 won't be a big difference. Generally you should go "up" two increments to make it even worthwhile from a cost standpoint, unless you just swap in a used 3.73 diff.

      Personally I think the 3.55 gears are a bit short but they do make for good highway mileage if you don't have a lot of hills and stay with the stock tire size.

      I've had my locker in for almost a year now in my DD and most of my driving is on the street. It won't cause additional wear on the drivetrain that I know of. might cause additional wear on the rear tires if you like to power through turns with the rear locked though ;). I mostly coast or use light throttle in the turns and haven't had any issue with the tires. Main thing is to just remember you have a locker and watch the turns when in slick conditions on the road. Other than than, when you are driving straight or in good conditions you won't really notice it's back there.

      Use a good quality gear oil in the 75W-140 weight and it should last you a long time.
       

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