Not wanting to stick a nose it where it isn't required but the WR and coupe quattro gearboxes have different final drive ratios, which ever you end up with needs to be matched to a rear diff with the same ratio or your going to break the transmission/prop or drive shafts /rear diff (not necessarily in that order) Probably preaching to the converted but heyho.
Roger Galvin
Technical Secretary, qOC
quattro Workshop
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