After 40+ pages it's probably time to summarize the points made, primarily along the lines of utility vs the latest upmarket products.
The original Defender
- Produced between 1983 and 2016, was primarily a utility vehicle for a variety of users, from farmers to work crews. It was simple to maintain and simple to fix in the field.
- The Defender underpinnings/drivetrain/powertrain were the basis for the Discovery I and Range Rover Classic.
- Engine electric connection was a virtual single wire for diesels.
- Simple cooling systems, field repairable.
- Land Rover went through the disaster of Britian's nationalization of their auto industry and the eventual breakups, 4 owners and financial stress, limiting investment- Investment in the Defender ended in the mid 90's while production ended 2016. Investment money went to the Discovery I. The Defender was withdrawn from the US market in 1997 due to lack of investment/upgrades
- The Defender, Discovery I and RRC were solid axle suspensions, some using Boge self-leveling units. The RRC eventually went to air suspension. Vehicles of this generation shared many design aspects across the industry. Field repair was as close as your local used parts yard or corner supplier. They rarely broke and would go for 500K miles before service.
- 3 differential drivetrains that could easily be upgraded with ARB lockers both front and rear
- Standard brake systems, easily rebuilt by owner, long lasting.
- Traction control began to appear on the RRC
- 15/16" wheels with large range of tires available. Easy to find off-road profiles.
- Large aftermarket support by a variety of vendors
- Lower maintenance intervals but less fragile
- Low maintenance cost as many repairs can be completed by owner.
The new LR3/LR4/Discovery3/Discovery4/Upmarket Defender/really the entire product line today.
- Produced from 2006 to today, targeting upmarket consumers, moving away from utility, farmers, work crews. Significant increase in complexity, limited field repairability.
- Supporting comfortable long range drives and higher speeds.
- Nürburgring ring testing highlights the move to urban vs rural usage.
- Large brake rotors to accommodate power/speed/braking.
- Torque vectoring brake systems, roughly 1/3rd the life of older systems, high brake dust/pollution.
- 19" to 22" wheels with low profile tires. Off-road tires hard to find.
- Fashion statements creep into product line. LR adopts BMW 'design language' adoption where all vehicles begin to look the same, just different sizes.
- High computer control chassis with tools such as IIDT for diagnostics/resets. Mostly not field repairable.
- Moving to even higher software control with OverTheAir updates.
- Infotainment systems highly reliant on urban communication systems
- Hybrid powertrains that are not field repairable. Engine management systems now run from front to back of chassis.
- Sophisticated cooling systems requiring multiple radiators and air duct routing.
- All air-suspension with increasing levels of traction control and the option to add a rear locker as a 'HD' option. Front locker was offered by Arb but is rare and no longer available?
- Traction control is intended to replace the need for lockers, works most of the time but has limited capabilities when all four wheels loose traction. Cases are loose gravel/rock, wet grass, slick mud.
- Majority of volume is traction control only, no lockers.
- Air suspension lifetime is in the range of 150K miles, depending on use profile and environment, some higher mileage and some lower mileage. Early issues at 30K miles have been experienced.
- Coil conversions are available once the air suspension is 'worn out', retain traction control with maintenance similar to ABS
-
FASKIT Air Suspension systems (and others) are available to defeat the LR air suspension system in the event of failure to allow getting off bump stops.
- Longer maintenance intervals but more fragile.
- High maintenance cost as dealer support is required.
- Limited aftermarket support as LR defines options.
- Overall LR product line is moving upmarket with even the new Defender, targeting the urban customer and the occasional off-road trip, no longer targeting utility/rural market.
I'm sure I missed some important differentiators but thought I would put this out there before the thread is locked.
The move by LR upmarket has been seen in the past. MG was the entry level British sports car with Jaguar the high-end. Austin Healey slotted their car between them. Today Tata has collapsed Jaguar and Land Rover into a single design team to enable 'efficiencies' (really redundancies) and cross-brand technology adoption as they move both upmarket, opening the bottom to Ineos Granadier and others.