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XKR 4.0 to 4.2 engine & transmission change

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😀 Hello, my first post.  I have a 1998 XKR with a very tired 4.0 ltr engine and faulty transmission.  I can buy a 4.2 ltr complete with transmission and engine control module from a later XKR.  Has anyone out there actually made this swap?  It seems that physically it shouldn't be difficult but I'm a bit concerned about the electronic/electrical interface.  I would really value advice from anyone that has actually done this swap.  It often seems that when the going gets tough a lot of the experts revise their advice to " well a bloke told me" or " I heard of a bloke that did it".  Sorry but I really just need to hear from anybody that has actually done it. Many Thanks.

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