What year/model Defender? OE, aftermarket propshaft?
I'm pretty sure no OE D90 has a double cardan u-joint. Some aftermarket propshafts require the adapter which is supplied with the shaft.
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic