It sounds to me that you are taking the correct approach.
The Gbox most always supplied would be the R380 5 speed with a 1.4:1 LT230 transfer case. Auto Defenders would only have been the NAS '97 D90 model, not likely to turn up in the UK. If you decided to go the auto box route, you can easily put in a ZF4 from a Rangie, but the bellhousing would be different, as would the flywheel. ( I am not sure about the flexplate, and torque converter for the 300 Tdi, but I would guess there is one, as there were plenty of Diesel auto Range Rovers. The rear transmission mount crossmember is different also, none of which are showstoppers. The transmission oil cooler for the R380 won't be sufficient for a ZF, so you would have to add the extra cooler from a Rangie also. I would think you ought to find a good 3 door 110 from the eraly '90s pretty reasonably. A 3 door makes a better expedition truck unless you'll be having more than one passenger.
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