Dumb questions

[ScottieJ]

is the diff the same size as the lj ones bolt pattern wise? if so its 410, should be 4.11:1

Doesn't fit in the axle, should SJ diffs fit into LJ axle? and the bolt spacing is different

only 410 diffs, it used to be common to use lj diffs to lower the ratios in 410s. unless they don't fit the other way around, however i'm confused by the bolt pattern being different, it shouldn't be.

410= 4.11:1 (37crown wheel > 9pinion)
413= 3.909:1 (43 crown wheel > 11pinion)
Samurai= 3.727:1 (41 crownwheel > 11 pinion)

edit: found this on another site
lj10/lj20 centres are smaller and not interchangeable with later Lj50/lj80/410 / maruti diffs

Lj10/20/50/80(mark1)/81 all have 22spline side gears front and rear
LJ80(mark2) and sj410 has 26 spline side gears in the rear

26spline side gears only fit in the Lj80(mark2) or 410 carrier which can be swapped into the earlier lj50/80/81 diffs
lock right 1510 works with either lj80(mark2) or 410 26spline side gears.
Lj80 and earlier side gears have a square tooth profile
sj410 side gears have a rounded tooth profile .

[andyrew]

Have you tried dropping it on your foot to see if it hurts as much as
an lj diff?

[ROBBIE]

Have you tried dropping it on your foot to see if it hurts as much as
an lj diff?

On the other foot, have a matched pair? unlike diffs which I don't seem to have