I am in the middle of this project along with sub-frame collars from Z1.
1. I purchased the removal tool from GK Tech, similar to Z1. This helped in removing the old bushing core and I used it to install the new bushing. However, it was useless in removing the old sleeve. IMO you will need a reciprocating saw to remove.
2. Make sure to have the bushing flush with the front of the frame. Failure to do this will mean the mounting holes for the other two bushings will not align. And you'll need to redo the rear bushing.
3. I agree having a 2nd person will help a lot in finessing the diff into place.
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