Installing LSD without having to re-setup gears

@Rob5589 so I've got the old diff out now. I measured backlash before taking it out (measured .003 to .004 - pending I did it right). I've only got the two spacers, one on each side, so I'm assuming the shims are underneath the carrier bearings. I have new bearings and a set of shims. Question: Is it easier to just reinstall the existing shims and mess around with different sized spacers, or will that not get me close enough to the true backlash and pattern I need? I feel like I need a setup bearing for this because I really don't think this DTT will be the same fit as the open diff. Thank you for your time and sorry to @Thumper4fun for highjacking your post. I hope we can add something to benefit from it for others.
 
@Rob5589 so I've got the old diff out now. I measured backlash before taking it out (measured .003 to .004 - pending I did it right). I've only got the two spacers, one on each side, so I'm assuming the shims are underneath the carrier bearings. I have new bearings and a set of shims. Question: Is it easier to just reinstall the existing shims and mess around with different sized spacers, or will that not get me close enough to the true backlash and pattern I need? I feel like I need a setup bearing for this because I really don't think this DTT will be the same fit as the open diff. Thank you for your time and sorry to @Thumper4fun for highjacking your post. I hope we can add something to benefit from it for others.
Those “spacers” are the carriers shims. I just regeared mine 44’s and there were no shims under the carrier bearings, just one thick shim on each side to adjust backlash. When reinstalling, I started by using the original thick spacers, checked backlash and adjusted by using different thickness shims until BL was within spec.
 
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Those “spacers” are the carriers shims. I just regeared mine 44’s and there were no shims under the carrier bearings, just one thick shim on each side to adjust backlash. When reinstalling, I started by using the original thick spacers, checked backlash and adjusted by using different thickness shims until BL was within spec.

The shims that came with my new bearings only fit around the housing. They're not large enough to fit where the spacers are. Guess I need to get a new shim set then. Thanks for the help.
 
The shims that came with my new bearings only fit around the housing. They're not large enough to fit where the spacers are. Guess I need to get a new shim set then. Thanks for the help.
I picked up a master install kit and it had a selection of shims for the inner and outer pinion as well as shims the same diameter as the thick shims