hi guys.
i just put an OEM factory LSD into my zenki t series.
it's 2nd hand so cant say it would be in the best condition.
it will not lock in first gear, just singles
it will lock in 2nd and 3rd though.
is this normal?

also, does anyone know how these LSD's work,
-by springs?
-by clutch packs?

any info would be highly appreciated.
Fil.