The Y61 is also 50mm wider track than the Y60. No biggee if you are swapping both diffs as a complete package but you may encounter rim offset issues and tyre scrubbing if you have big rubber set up on the existing Y60 track.
Marks and prob some others make a rear diff adapter so you only have to swap the front diff from Y60 to Y61 and can leave the original Y60 diff in the back if you wish and just add the spacers. Reco GU axles come in the kit. Obviously if you have a donor vehicle or both diff and axle assy's already then no kit required
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