USA Standard Gear Spartan Locker for Dana 30 Differential 27 Spline (SL D30-27)
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Availability:
In Stock.
Arrives
Jul 18 – Jul 20
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Style: Dana 30 Differential 27 Spline Count (SL D30-27)
Features
- Made from 9310 steel for added strength
- Replaces the spiders in a standard carrier case
- Mechanical locker delivers reliable 100% lockup
Description
The Spartan Locker, by USA Standard Gear, provides reliable traction at a low cost. The Spartan locker's design does not use the thrust washers and has a revolutionary spring and pin design that makes installation a snap!This automatic locker replaces the stock side and pinion gears while utilizing the factory open differential case. A new and stronger center pin fits in oval slots between two inner drivers. Under load the center pin forces the inner drivers outward to engage the outer axle couplers on each side of the case. This provides locked power to both drive wheels, providing greater traction. When turning, one driver is unloaded and the teeth can ratchet across each other creating differential action to reduce tire wear and make turning the vehicle easier. This is one of the most economical lockers on the market today.
Brand: USA Standard Gear
Recommended Uses For Product: Automotive
Special Feature: Lockable
Mounting Type: Floor Mount
Room Type: Home Office
Is Discontinued By Manufacturer : No
Item model number : SL D30-27
Date First Available : February 13, 2012
Manufacturer : USA Standard Gear
Country of Origin : Taiwan
Best Sellers Rank: #21,162 in Automotive (See Top 100 in Automotive) #2 in Automotive Replacement Differential Assembly Kits
#2 in Automotive Replacement Differential Assembly Kits:
Customer Reviews: 4.6 4.6 out of 5 stars 1,950 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jul 18 – Jul 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Style: Dana 30 Differential 27 Spline Count (SL...
This is a very nice locker. it works very well and installs easily with hand tools and no special tools, knowledge or equipment. (you just need a torque wrench, sockets a punch for the roll pin) Offroad this thing is amazing and will pull your jeep over things that were impossible before. However on-road this is VERY sensitive to tire pressure. Make sure you rotate your tires often and monitor tire pressure frequently. even 1-2 PSI is enough for it to act squirrely. This is especially noticeable for the first 1000 miles. During break in even in 2wd with the locker in in a front differential, It can lock up and make the jeep hard to handle. After it gets worn in - it works like a dream but if you put it in right before winter you will struggle. During break in the unlocks are LOUD -almost like a bang. You will get looks in parking lots where people think you broke something. The steering is much tighter in 4wd then before you put this locker in and it will not turn as tightly in 4wd. Offroad in 4lo with this in the front dana 30 you will have to make more multi point turns (or get a terra 2w low kit for your np231 so you can shift in and out of 2w/4w low on the fly to get the front to unlock) The TJ i put this in didn't work right until i ran it through a couple tanks of gas and flat towed it at 65 for about 650 miles - then it was good to go. In the YJ i put this in it wasn't "right" with the world until just after 1000 miles This does have some negative driving characteristics in 4wd as well. If it's icy you need to be very careful - if you have this in the front axle it will understeer and the locker will not always differentiate because it needs that friction with the road to do so. you will find yourself putting more and more wheel into a turn and then when it finally unlocks it will get squirrely. It will also understeer and is much more likely to loose lateral control in the ice. If you put one of these In the rear it will torque steer (pushing you in a straight line) for as long as you are on the gas. If you don't watch it closely you WILL do unintentional lane changes or donuts when its icy out on the road. Do not just toss the keys to your buddy who doesn't know how to drive an auto locker in in a light vehicle when its shitty out. It will take some time to learn to drive it, you drive allot with your foot - you learn to let off around curves, lane changes etc. Make sure to give yourself some time to adjust to how to drive one of these on the road. Spend some parking lot and back road time with it when its crappy out until you get used to it. When shifting out of 4wd the jeep will have a tendency to not unlock the front axle. If you let it roll with the trans in neutral and turn the wheel back and forth a bit it helps. This gets much much better after you break it it (that first 1000 or so) Finally if you didn't pay attention to the tire size limits - you are much more likely to break axle shafts with larger tires with one of these. Make sure you know out to pound out a u-joint or pull and inner CV . I didn't start breaking things until i went over 33s then it was quite often until i went to 4340 chromoly shafts. The inners are what tend to break on stock shafts and the CV cups blow up on the ZJ shafts. basically take your time, learn to drive it, keep in mind of the limitations and dont judge it until you have that first 1000 or so on it and enjoy the massive off-road advantages
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Reviewed in the United States on January 6, 2022 by Chris
Style: GM 8.5" Differential-28 Spline Count (SL...
Shipped fast, easy to install and made a huge difference on how my tj gets around. Wish it still had paper instructions and not online. Great company to deal with as always.
Reviewed in the United States on September 28, 2024 by Nick Rowland
Style: Dana 30 Differential 27 Spline Count (SL...
I installed it into a Dana 30 HP for my 99 XJ. Really easy to install, it took a couple of hours. Perfect fit, follow the instructions to the dot and you will be pleased. For my application, it is really quite, I can barely hear it while turning. BE AWARE, it might lock and unlock (in 2WD) the first 10 miles. I drove my Jeep to a parking lot and drove in circles forward and backward for a few minutes to help lubrication and to brake-in the locker. Then I drive around town for 20 min. Finally, I took it to a fire road to see how the locker works, I put it in 4 low works like a dream. It is a day and night difference. Ever since I have driven the jeep on the freeway for over 200 miles (commuting) and that has helped with lubrication. Now the locker is even quieter. I am planning on replacing the diff fluid in a few more hundred miles to remove any potential debrief from the brake-in process.. Instructions don't say anything about it but I figure gear oil is cheaper so why not. I should be going to Moab and other off-road trails in the following months, I will give an update on how it holds. UPDATE 10/23/2019 - I have run it for about 1000 miles, I have got really quire, even when I am at full lock turning in parking lots. I run Valvoline 80w-90. I have taken it off-road (Moderate trails) and it has performed great. Something that I have noticed is that right after using it on the trails, I would go back into 2WD and it gets way noisy!!!! but after driving for 20 miles it goes back to quite mode!! Loving it! IT WOULD LOCK AND UNLOCK once in a while when backing up and turning, but you can feel it in the steering wheel, it makes a loud pop noise, but if you were the one installing it you won't freak out, you would be able to tell "bad breaking noyses" from the locker loading and unloading lol 11/21/2019 Took it to rattlesnake trail (moderate to difficult) in Utah. I performed great. I was able to struggle less than my buddies with larger tires and open differentials. I have put around 3k miles on it. The more I drive it the quieter it gets. Now I can only hear it sometimes when turning full-lock on parking lots. It stopped locking-unlocking on his own while driving in 2WD on parking lots and tight places. I will keep you all posted. 12/19/2019 I have driven it for 4k miles now. I went to Moab last weekend. Wheeling on slick rock was like driving on pavement sometimes. The Locker would bind and lock and unlock pretty hard. So I had to take my turns pretty easy and some times I would cost in neutral. (I have a 5 speed). I still love it, I got me over obstacles way smoother than my buddies with bigger tires. I was able to take the hard lines on trail w/o major issues. The locker has gone quieter after many miles. I can hardly hear it while turning in parking lots.
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Reviewed in the United States on September 10, 2019 by Analy
Style: Dana 30 Differential 27 Spline Count (SL...
Easy installation just have to follow instructions. Works great.
Reviewed in the United States on September 2, 2024 by Chris Bivens
Style: Chrysler 8.25 Differential 29 Spline Cou...
It takes a bit to get used to the rear axle always being locked. In rain or snow be careful on sharp turns the rear will occasionally want to slide. The clicking of the ratcheting is not bad at all. Most audible in parking lots making sharp turns. In snow USE 4X4 or the rear will constantly try to pass the front. On the positive side. This thing is real tough! It locks up tight and really makes your vehicle get traction. Best way to get an inexpensive locker.
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Reviewed in the United States on May 8, 2024 by Mark