I have the Blistien 4600 at OEM ride height and OEM sized tires. They seem to be a minor improvement over the OEM ride, perhaps slight overdamping to make it handle better and ride firmer, but that is just a very vague perception. One of my front shock/struts was blown when I pulled it, so my OEM ride/handling was definitely degraded by the time I replaced them with Blistien's. They appear more durable than the OEM shocks/struts, so I'd agree they are an upgrade in performance and durability, considering the price if you comparison shop (the same if NOT less than the OEM part, but a little more than cheap aftermarket replacements that won't perform or last nearly as well), they are well worth it. NOT sure I would agree they are "Major" upgrade, don't expect a "Major" difference unless your shocks/struts were in really bad shape, and in that case it would be getting the original ride/handling back plus then a little more.
Judging shocks is such a vague endeavor anyway, for two reasons. One the math is so incredibly complex amateurs like you and I can't compare them by numbers, and shocks are one where the bigger or smaller number is NOT best, its the "RIGHT" number (or a whole table of numbers really). Mechanics and Technicians aren't capable of judging a shock on specs alone either, that is why you won't find specs for shocks, I'm talking engineers that specialize in suspensions are the only one's capable of evaluating a shock on its specs, everyone else has to trust brand reputation and experience of others giving qualitative evidence of how well it performs. Two, most people replace older worn out shocks, so the ride slowly degraded over time, so folks become accustomed to the degraded ride like a frog in a pot of water heated slowly. Thus fresh shocks give the perception of great improvement in ride/handling, when in reality the original ride/handling was just restored by replacing the worn out shocks. The ride/handling might NOT be as good OEM, just better than ride of the worn out shocks.
Blistien only "lists" their 5100 shock for the Jeep Grand Cherokee (JGC), the WK and XK are the same platform (different body codes) and share the same suspension parts. So any shocks for a JGC will fit and work (maybe NOT as well) in the same year/generation Commander.
There is thread on here about a guy complaining that he put Blistien 5100 on his Commander, had one blow, and Blistien refused to honor the warranty. Blistien claimed that he was off-roading because the photos he sent had the suspension splattered in mud, which voids the warranty. But mostly because Blistien does NOT list or sell the 5100 for the Commander, although some resellers knowing it will fit, will sell them for the Commander (Blistien can't be held responsible for other company's reselling their product differently then they intended).
Still no word from Blistien why they don't list their 5100 for the Commander, when Chrysler itself builds both the WK and XK (platform/body codes) with the same shocks?
Your mechanic has to worry about liability, that alone could be a reason why he might refuse to install a part not intended for your vehicle, especially suspension, which undeniable can be a factor in many accidents.
The 5100 shock is 2" longer, making a good shock for lifted vehicles. The 5100 front shock/strut has an adjustable perch, and at its lowest setting is 3/4" higher than the stock ride height. So this throws off the ride height when using a lift kit, that most are designed to raise the front slightly more than the rear and level out the Commander. There are lots of threads about this, either folks in the know recommending NOT to use the 5100 shock in the front to avoid the mismatch in ride heights or buying different or swapping around or stacking spacers to even out the differences to get an even ride height. If you're happy with your ride height, that alone is a good reason to avoid the 5100 in the front because it would change it and you would spending money and time trying to get it back to a ride height you like. I'm NOT sure, but judging from the few things I read, if you used the 5100 at the lowest setting on a non-lifted Commander or JGC, it would raise the front 3/4" and would level out the vehicle very nicely with the OEM ride height in the rear.
Replacing springs? Ok, modern high quality OEM springs will last many millions of cycles, easily 200k miles or more. I wouldn't hesitate to use a junkyard spring, that is how well they last. True the old Leaf Springs, for various reasons did NOT last or were easy to damage that resulted in them sagging. Today, modern coil springs? The only reason they would sag or degrade in performance was if they suffered damage. And extreme use could damage them, so its possible but NOT likely in most vehicles. We are talking extreme off-roading, overloading the rear suspension while towing, etc, etc.
On top of that, if you want a lift and replace your springs, why didn't you buy aftermarket springs that are taller? Usually, granted NOT always, raising a vehicle with taller springs produces far better performance then raising it with just blocks stuck under the springs.
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Last edited by Mongo; 12-11-2015 at 08:47 AM.