I've was just shooting for an over simplified comparison. 8 speeds is better than 4 with an overdrive if you're stuck in high range. I'm sure if you took the time you could do all the calculations with diff gearing, torque converter, tire size etc. Maybe I'm wrong when you factor all that in.
There's a small advantage of having an 8 speed transmission in the D5, 1st gear is 4.7:1 ratio. Compared to a D1 with 3 speed transmission, 1st gear is 2.48:1. I have no idea what the final drive ratio is, but all things being equal a D5 with no low range isn't quite as crippling as a say a D1...
LR lists various springs in different class ratings for the D5 in their parts catalog. I think that's the only option at the moment. The lack of low range in the coil version would be more my concern.
That's a great deal if it's truly in good condition. I was looking for that car essentially and I'm in St. Louis. 🤦♂️ I'd jump on that if I didn't just reluctantly get out of the Land Rover game for a bit.
When you add air-suspension to the 90 it comes out to basically the same price as a 110 which includes air-suspension as standard. You really have to want a 90, because value wise they don't make much sense.