Make yourself a free account on Topix and enter the VIN. It will tell you everything that is available to it on the car. I have the details of all four Land Rovers that are in my family. Less info available for D3's than D4's though.
It is easy to see by looking at the diff if you have access to the car. It has a bit like an electric motor attached to the top if it is an ediff.
Ediff makes no difference to the capability of the car so you don't need to get hung up on it. It will save some of the single wheel braking in extreme conditions but the traction control works fine without it. In fact, my 2014 L405 Range Rover performs better in crossed up axle conditions without a diff lock than my D4 does with a diff lock. They both get through but the L405 does it much easier. My son's V8 D3 with no diff lock does it a bit harder again but still gets through with no problems. Just a bit more slipping of wheels until the traction control sorts it out.
Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
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