I just installed a Lock-Right locker in the rear of my '97 Sidekick Sport, and it's not acting quite right. It's a 1510 model, which Trail Tough assured me would work if I reused my old spider gear  & pinion shafts.  I notice that Trackers call for a 1512 model. What's different? When I turn sharply, such as pulling into of a driveway, or turning into a gas station, it groans loudly, and the whole vehicle shudders. This thing is Loud & scary! I know that Lock-Right recommends turning under throttle, but that's not always achievable. It feels like it's not unlocking, and I don't hear the "clicking" noise that it should have. I had a EZ Locker in a Samurai I used to own, and it never did this. It would just "click-click-click" when turning . This has me wondering if I'm going to bust an axle. Is this normal in an Automatic equipped vehicle?

uh a 1510 should not fit in a sidekick rear diff. you can use one with mods in the front diff but not the back. you are correct in it should be the 1512. thats what I have and it makes the click-click sound when turning with no load. recheck the product # and if its a 1510 get it out of there right away.

  A 1510 lockright will work in a kick rear diff. Owned my hybrid  rear axle for many years and have always used a 1510 lockright in it.  Maybe it was setup too tight?  Sometimes you need to use different sized shims on the spider gears and shave the center block.

Yea, I talked to Brent at Trail Tough yesterday about it, and it sounds like I need to take one of the shims off of each side gear, and sand a little more off of the center block.  Anyway, he's a nice guy, super customer service. He told me everything I need to look at since the instructions leave a little to be desired as far as specifics. I'll tear into it tomorrow and see what the problem is. Thanks for the replies!

Dont they have a "go no-go" tool to check the clearance between the disks?