SJ413 diff into Samurai worth doing?

[Ruru19]

Hi all, I was questioning putting a SJ413 diff (3.909 ratio) into the samurai (3.727 ratio) this giving a reduction of 4.66% (If I've calculated right) is it worth doing or just silly?

[ScottieJ]

If you are on larger tyres than stock then yes

[Ruru19]

Ok thanks, was thinking on the first part of the build to go with 235/75/15 tyres and a 410 t-case, but eventually will be running 31/10.5/15s with a 4.16 rocklobster liked the idea of the sj413 diffs to make up the size to gearing and put a lockright in the front. Thanks again Scottie.

[Jordi]

I found just a 4.16 t/box and standard diffs was fine on 31s.

If the old diffs are ok and your definitely swapping the t/box i’d leave the standard diffs in.

[Ruru19]

Ok, as I have a complet set on front and rear axles was going to recondition once the build was done and stick SJ413 diffs in, would mean I can have both to hand to try out, wanted to add a lockright in the front anyway. So seemed a nice option to have.

[ScottieJ]

410 transfer box on its own is the right correction for 235/75r15 to get you back to pretty much bang on the stock on road ratio. Once the 31s go on dropping the diffs to 3.909 will again take you pretty much back to the original on road gearing, i.e. within 1-2mph of the same rpm to speed in each gear that you would have on stock height tyres with stock gearing.

Personally I would not fit a lock right in the front, it will destroy your turning circle in mud offroad.

[mike harris]

Lock rites !!!

Get it in there !!

[mike harris]

Get that lock rite in there !!! Take it from my experience, makes the truck so much better Offroad !

Front locker best modification, just behind Subaru Impreza master cylinder !

Fit free wheeling Hubs, turn the axle off for road use.

If you need any help or anything man just ask always happy to help another lock rite lover out !