So I figured based on
@naks post above, that the subframe lift by J Auston Fab would get some more conversation than it has thus far.
Momma told me that if I don't have anything nice to say...
Seriously though, the reason this lift kit isn't getting much conversation is twofold. First, J. Auston Fab has been around for decades but that entity is practically a ghost. I don't know if this is by design or not, but it is what it is. They finally got an IG a few years ago, and I think that's because they finally started getting some business on Gen 2 RRS lift kits due to that Supercharged red one that they did a subframe lift on; J Auston actually started with H1's though funny enough, so that shops involvement with LR products is fairly recent. I believe their last project was an L405 LWB on 35"s.
More importantly however is the price: A 2 inch subframe lift is $5,250, a 3 inch lift is $7,250, and a 5 inch lift is $10,500. I don't care how rich you are, that's a TON of money. I know, I know, I know...people blow $5,000 all day on Jeep suspension lifts and axles, but that's kinda become it's own absurd subset of individuals in a much broader community. The Defender market is relatively small, and I don't ever see myself dishing out $5,500 (plus labor) to get a 2 inch lift. Yes, the subframe lift keeps the stock driveline angles, but it requires a TON of work to do it (Dropping both subframes, wheel spacers, cooler mod, custom exhaust routing, trimming, etc...). Furthermore, their claims about maintaining a factory warranty are dubious. I'm familiar with Magnuson Moss, and the reality is that you've still tampered with the suspension. No amount of expert witnesses (if you decide to fight the denial in court) are going to be able to get away from the fact that you've modified the basic architecture of the vehicle. You can argue all you want about maintaining stock driveline angles on everything and maintaining stock airbag pressures, but I'd still slam you as Defense Counsel for running a 35" tire because the vehicle was not designed for that sort of unsprung weight and rotational mass.
Furthermore, (and please correct me if I'm wrong), but these subframe kits don't magically create lift out of thin air...there has to be a compromise. The subframe is dropped by whatever the corresponding lift amount is from my understanding. So great, the body gets lifted, but at what cost? You're dropping the subframes back closer to the ground and no longer maintaining a relatively flat bottom. This all leads me to my final point here: are you really going to do more than a 35" on a New Defender and still keep it usable? You can get a 1" rod lift and stuff a 33"/34" without issue/compromise. You can technically stuff a 35" with the LK8 1.5 rod lift, but now you're compromising and losing downward travel (Nobody has been able to give me a straight answer as to whether the New Defender will self-raise if it encounters rough terrain - if it doesn't, then I'd argue 1.5 inch lift is fine as long as you lock the vehicle in "normal" mode when off road). I still maintain that the solution here isn't as drastic as a subframe kit, but rather something akin to the old LK8 LR3/4/RRS SYA kit. You'd be able to maintain stock airbag pressures and would only be dealing with the increased angles in the drivetrain. Not an ideal solution, but frankly it's really a non-issue because I guarantee it's going to be the same amount of wear on the drivetrain that someone running exclusively the 1.5 inch lift rods would be incurring. If that's the case, then I'd be shocked if this new Defender is any different from previous air sprung LR's in the sense that the overwhelming majority of us never encountered issues with running a mild lift. So what would change here? This kit works, but it's overkill for 95% of us and it's priced in such a manner that I don't think it merits a conversation since 95% of people will be priced out of it as well.