By the way, Allisport is a solid choice — I’ve been running their stuff for a while and it really holds up under pressure. But I’d also suggest giving all your coolant hoses a once-over, especially if they’ve been on there for a few years. I had...
In 99% of cases, you can stick with the stock Defender front driveshaft when running a 300TDi with an LT230, since the transfer case sits pretty much where it does on a 2.5NA setup. That said, it’s always a good idea to measure the actual length...