It's a cone style SG unit.
I've been looking in the service manual, but it says the unit isn't servicable, so how does a guy get it apart, and back together without messing it up?
Thanks for the reply.
I've done this with a cone type Suregrip. You will need to remove the suregrip unit and disassemble it to remove the thrust block. BUT WAIT!!!
1. Did you buy new axles with greens installed? If yes, have you asked axle manufacturer if you need to move thrust block? As you said some require, some do not, it depends on axle length. If you're using stock axles, then yes you will need to remove the thrust block.
2. If you need to remove Suregrip you first need to check gear backlash with dial indicator (see FSM for procedure). Then you will need spanner wrenches (borrow, loan, or make your own) so you can properly set backlash to original specs.
This is not that tough if you follow procedure for removing/installing suregrip and setting backlash. The Suregrip does come apart easily (a few bolts), it's not servicable (rebuildable) in the same manner as the clutch Suregrip...but that's another story.