Spartan Locker Helical Limited Slip Differential Worm Gear Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD)

When the jeep was open/open, you had to wait for the BLD to tranfer power. My next upgrade was a detroit locker in the front dana 30. 100% traction everywhere. But, qwirky steering, especially when trying to go fast. No problems in 2wd. So, the detroit popped and I needed a quick solution. I bought and installed the helical with new bearings. Wow! It grips hard! But no torque steer like the locker. Now, BLD plays a big role with the helical and the response is instant. Feels like a locker even with one wheel in the air. You know, just like tapping the brakes. Well, guess what the BLD does for you at the speed of light. FYI, my rear diff is open! Love to put a detroit back there! But, don't want to risk limp mode or driveabilty. So, I am saving for a selectable in the rear dana 44. Anyways, the helical in the front dana 30 is a major upgrade for roughly $350 plus install, which can be done with minimal tools. You will want someone who knows how to shim and get the right clearence. Take your jeep to the next level with this simple upgrade without spending a ton and no driveabilty issues in any weather!

I installed it in a Jeep Wrangler TJ. I adjusted the gear without any problems. I did a test drive without the rear shaft. My right wheel was standing on the concrete. I landed on the wet grass with my left wheel. I looked out of the car at the left wheel and pressed the gas pedal hard. The right wheel squealed, and the left wheel turned exactly the same. Not a bit more.This is an excellent differential and I recommend this purchase

The media could not be loaded. I just installed 4.56 gears in my xj and had to get a new carrier for that ratio. This locker seemed like the perfect option, and yes I am calling it a locker. It looked very high quality and had zero runout when I was setting up my gears. For the price these go for you get a new carrier that fits 3.73 and up gears and a locker that is completely undetectable on the road in 2 or 4 wheel drive from what I can tell. And it literally shocked me at how much traction it provides off road. The video I shared is of the first off road trip with the new gears and this locker. My rear end in the back is still just an open carrier so you can really see just how good this Spartan helical locker is when my jeep Gets in a bind. When I started spinning and not going forward, I just tapped the brakes and it locked the front axle up immediately and popped me up and over that rock. I was shocked at how good it worked and was a little bit more jerky with the throttle than I needed to be but the jeep got it done! I hope they make one of these for my chrysler 8.25 rear end and I will definitely buy it. Awesome product, I would give it 10 out of 5 stars if I could.

It took me a week of evenings to get my gears set up (results may vary). Paired with the new 4.88s this is one of the best upgrades I have added to my lil YJ. Smooth, quiet and unnoticeable under normal driving conditions, even in 4wd. No pulling or hard steering, but definitely improves traction. Proper brake input and it basically turns into a locker, way cool. Probably not good for rock crawling, but I don't do that. This helical LSD has helped transform my Jeep into a VERY capable off road rig.

Went in easy (relatively) works great!

Great company and products

I really can’t leave a worthy review at this time. I am in the process of acquiring parts for my axle rebuild.

This Spartan Locker is awesome. Super quiet, a breeze to install, as long as you know what you’re doing, and works flawlessly. I would highly recommend this unit, especially for the price. It’s every bit as good as an Eaton Detroit Locker but for less, and it may be a better design. I love it! I installed this along with new 4.56 gearing, and man my XJ can now go anywhere! Just buy it!