ARB Dana 30 27 Spline 3.73 Ratio Up Air Locking Differential - RD100

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  • ARB 4x4 Accessories | Part Number: ARBRD100
  • Popular Axle Manufacture:Dana
  • Axle Location:Rear|Front
  • Fitment:Universal Fit
  • Axle Type:Dana 30A KJ|Dana 30 JK|Dana 30 Reverse|Dana 30 TJ|Dana 30 Standard
  • Availability:In Stock
  • Axle Spline:27 Splines
  • Differential Type:Selectable Locker



The ARB Air Locker is a pneumatic locking differential that uses air to facilitate the locking of both axles. This action converts your differential from a conventional open to a full spool type axle supplying 100% power to both wheels to keep you going through the worst terrain. ARB onboard air compressor required to activate Air Lockers. Sold Separately.

Customer Reviews

4.7 4.7
3 Customer ratings
5.0 DIY ARB Dana 30 27 spline 3.73 RD100.

Everything went well! directions easy to follow. I had put the rear lockers in last year, again with no issues. Would not attempt this if you have no mechanical ability and patients. You do need some special tools torque wrench, axel housing spreader, back lash indicator, heat gun.

from Reno Nevada |
5.0 Worth Every penny!

Works great and doesn't affect driving or turning when not engaged unlike auto lockers that affect how sharp you can turn. You never know it is there until you flick the switch.

from Durant,OK |
4.0 Gotta be locked!

I have ARB Air Lockers in my 04 TJ. I love the on-board air compressor that came with my setup. I was able to use my lockers the day after I got them installed at Browns Camp in the Tillamook State Forest. The only thing that I would change about the system is to be able to select which axle I want to be locked.

from Portland, OR |


Question & Answers

5 Answered questions

Q: Does this locker replace the carrier in a Dana 30, or is a separate carrier still required? Answer this question

A: Yes it is a full carrier.

Answered by Kelly from 4WP Corporate Headquarters on 07/28/2021

Q: Will this lock fit a 2007 Ford Explorer? i think the front differential is a Dana 30 super 27 spline Answer this question

A: The ARBRD100 will not work on the 2007 Explorer Super 30 front end because the spider gears are not machined for the stub axle retainers on the IFS front end.

Answered by Kelly from 4WP Corporate Headquarters on 06/17/2021

Q: I have a 2015 Toyota Tacoma Trd Sport and I was wondering if this locker will fit in my truck for front and rear locker? Answer this question

A: Hello Depending on the gear ratio the front would use the RD111 or the RD121 and the rear is the RD129 Thanks

Answered by Rody on 07/10/2015

Q: By 3.73 and up do you mean numerically higher? Or higher gearing? I want to install this in a JK dana 30 front diff with 4.56 motive gear ring and pinions. Answer this question

A: Hello Yes 3.73 and up to 538 gears so this is the correct unit for your JK. Thanks

Answered by Rody on 04/22/2015

Q: I purchased a axle that already has this locker in it, I also purchased the ARB compressor CKSA12 to run the locker. I now need a solenoid and switch to provide air flow. Can you help. Answer this question

A: Hi Jery The part number for the solenoid is ARB180103 and the switches are located at the following link Thank You

Answered by Stevie on 12/27/2014


ARB has been manufacturing 4x4 parts for over 40 years. ARB Air Lockers will amplify the traction of your 4x4 on challenging trails. They give the off-road driver what you need in traction, control and performance. ARB believes in its products so it offers a five year, unlimited mile warranty across the air locker range. ARB 4x4 Accessories includes the suspension system brand Old Man Emu, maker of premium off-road shock absorbers. Old Man Emu premium shocks are developed and tuned specifically for each vehicle application. They come complete with vehicle specific mounting kits for fuss free installation. ARB parts are all developed, engineered and fabricated in-house in Australia. Shop ARB 4x4 Accessories Now


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