As far as I know, the only difference is the length of the pinion on the diff, when changing from the rotoflex to a uni you need to put a 10mm spacer in the D2 diff pinion, so if your using the D2 casing you'll need to put the spacer in, I don't know if this needs to be done if it's a straight swap using the complete centre and housing from the D1.
I think there is a slight difference between the centres and the housings.
Baz.
Cheers Baz.
2011 Discovery 4 SE 2.7L
1990 Perentie FFR EX Aust Army
1967 Series IIa 109 (Farm Truck)
2007 BMW R1200GS
1979 BMW R80/7
1983 BMW R100TIC Ex ACT Police
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