ring&pinion set info

[filh]

bought a ring&pinion set (4,7:1) from Spence Weir , but I d'like to get infos .
the pinion gear is marked on side with : 176=0 . I guess it's about pinion
depth , but I don't know the unit or value?
And I also would like to know how you measure that on housing?
I of course don't have the Toyota special tools.
If any body have information, or pics to see how I can clear that pinion depth tuning .
Just a little precison, the kit comes with a solid spacer and shims to adjust the bearing preload .
Thanks for helping a poor rallymen , sad with his long 4,3:1 ratio.

Phil