Drivetrain Questions Gears and stuff!!!!

[Paso76GMCstepper]

Ok I have a 76 GMC K15 350/SM465/NP205

I have a GM 12 Bolt in the rear. I took the cover off yesterday to change the gasket and change everything to Synthetic Gear Lube.

I know its limited slip but does someone have a site I can look up pictures for this rear end. Can there be different limited slip set ups in this rear end??

Also It has a DANA 44 front end. On the tag it says its 3.07 gears. So this is pretty high geared for a 4X4 Truck. If the front is 3.07 then the rear is the same right?

I am regasketing and sealing the trans and T-case so I am putting Mobil 1 Synthetic 90 gear oil in everything. All new ujoints, clutch and everything.