Yes, I did a search first.

Is ARB the only locker available for the D1?

Cause if it is, that sucks.(I hate air lockers.)

 

for example:

Detroit Locker Part EAT187SL173A - Detroit Locker Differential

 

Detroit, Ashcroft, KAM, ARB, theres a few others out there too. The KAM is electric activated similar to ARB's but no air lines. The Ashcrofts are air operated. Detroit is the only non selectable locker that I know of and then theres TruTracs but I consider that more of a limited slip then a locker. Also DII's and Defenders all take the same diff if that helps broaden your search a little.

 

Brian knows his lockers. Lucky 8 has all of these too if you want to read about them and compare prices

 

I am most likely going to pick up a TrueTrac for the front and a Detroit for the rear.

Here's a good article

Detroit TrueTrac® Differential

 

I keep forgetting to look at Lucky8. Thanks for the info.