It's been a little while so I just thought I'd chime back in here with a long term update on the prototype lift springs Eibach put on my truck. I've put on a little more than 10k miles since the install and I'm still really enjoying the daily driving. I would still describe it as a more planted feel, but without the harshness that might be expected. The truck currently sits slightly nose-high by roughly 1/2".
I'm almost ashamed to say, but I just finally had a chance to get out on some trails last weekend. We have a jeep now too, so the truck doesn't see much off road time. With the more planted (or firm) ON-road feel I was honestly a little worried about how that would translate OFF-road. I was completely blown away. I really only had about 1/2 a day to run around Anza Borrego so I ran at the full 38-40 street tire pressure. I would normally air down to 17-19, but even at full pressure the truck was a dream. The chatter and harsh rebound I had on the same terrain with my last TRX was gone. Really really impressed!
The one negative, not surprisingly is that the suspension is more prone hit full extension sooner. The 'thud' from full droop comes a little sooner and a bit more often than it did before. I say it is what it is. To me it's outweighed by all the pros. Aside from using the TazerDT to reset the suspension, I've never had the dealer do any kind of suspension recalibration. Not sure if that would make any difference, but I may ask next time I'm in to see if that would make any difference.
Side note: I had one of my CV boots leak a few months back. The dealer replaced the entire axle assembly on the one side. YMMV, but my dealer had zero issue warrantying the CV boot even with the glaring red front springs. On the work order they noted that one of the crimps on the boot was overtightened causing the tear. Who knows. I'm inclined to believe though that the increased CV angle MIGHT cause more wear on the boots, but my anecdotal research suggests that some trucks have boot issues while others don't - lifted AND stock.
View attachment 88961