Series 3 Prop shaft problems

Hi all, just wanting some advice really. when I bought my series 3 it had a n/a 2.5 Diesel engine fitted to the original 4 speed series box, I decided there wasn't enough poke to it so a 2.5 td engine went in which improved everything except high revving motorway speeds. I have now fit a 5 speed LT77 in but it sits a lot further back than the original box so I have had to make custom prop shafts as the front now needs to be longer and the rear one shorter. I was just wondering if anyone had done this mod before and how successful it was/is.
Thanks. Ben

Have a look at Bailey Morris in St Neots, Cambridgeshire, I think.
They might even have your required sizes in stock!

Thanks, I'll have a look. So is it a common upgrade??? Putting a 5 speed in