R230 rear auto locker

[KiwiTerrano]

Contemplating fitting an auto locker in the rear of my R51.

Trundles sells this one, which is listed for an H233b for a GQ/GU Patrol.

I presume this is a 33 spline diff.

Link below.

https://trundlesautomotive.co.nz/products/patrol-gq-gu-4wd-systems-lokka-front-diff-lock

 

I am considering fitting one in the rear of the my R51, which is an AU/NZ spec one with the R230 rear diff (see ARB catalogue). From what I can see this is also a 33 spline diff, with open centre, based off the same internals as the H233?

 

Anyone reckon this would work?

[Slartibartfast]

From what I've read, the rear of the Patrol is 33-spline, and the front is 31-spline. The 33-spline H233B is also used in the R50, but AFAIK the only ratchet locker for the 33-spline was made in Russia, so you may have a hard time tracking one down.

 

As for the H233 guts fitting the R230, I have no idea. If anyone knows, it's @hawairish.

[hawairish]

According to ARB, the R230 and H233B use the same 33-spline (both in spline count and axle shaft diameter).  That front Patrol unit won't work because it's 31-spline.  It's possible the 33-spline unit would fit an R230 carrier, given how close dimensionally they might be, but even if it does the R51 stub shafts use retaining clips to stay in place and it's unknown if it would clear the Lokka's side gears, or if the edges are chamfered to aide installation or removal, among other potential issues.

 

Air locker options exist.  ARB (RD137) or a cheaper TRE 4x4 (TR137), assuming you have 3.54 or higher numerically gears.

[Nd4SpdSe]

On 9/7/2023 at 1:23 PM, hawairish said:

According to ARB, the R230 and H233B use the same 33-spline (both in spline count and axle shaft diameter).  That front Patrol unit won't work because it's 31-spline.  It's possible the 33-spline unit would fit an R230 carrier, given how close dimensionally they might be, but even if it does the R51 stub shafts use retaining clips to stay in place and it's unknown if it would clear the Lokka's side gears, or if the edges are chamfered to aide installation or removal, among other potential issues.

 

Air locker options exist.  ARB (RD137) or a cheaper TRE 4x4 (TR137), assuming you have 3.54 or higher numerically gears.

TRE also makes them in electric, but also makes both for the 2.9/3.36 gears as well.

[KiwiTerrano]

Yes, to be honest I think I'll just run an E locker. Ideally I also want to get a set of diffs out of a diesel one to drop the gearing down a bit too before fitting a locker to compensate for the 33s.

[Nd4SpdSe]

I found a calulator for tire size vs diff ratio and found that going to my 285/70r18`s I would need a ratio of 3.13 to compensate, so going to 3.36 from the Armada/Titan is plenty, but I have seen others do the 3.54 and 3.69 from European trucks. 

I finally got my TRE E-Lockers in a few months ago and the`re wonderful. I haven`t used them much yet but on it`s first official outting I broke my rear driveshaft, likely from some previous damage which I don`t believe was me, but I was double-locked and bounced the truck when it happened. I`m honestly affraid to head back out until I get skid plates installed. There`s been much argument against converting to a steel driveshaft.

 

[Slartibartfast]

Bouncing does tend to break things, but I would not have expected the driveshaft to fail first. Would make sense if it had a dent from prior abuse.