to stay up-to-date on our promotions, discounts, sales, special offers and more. A well made part, be prepared for a fight to get the old one out on the Grand Cherokee! To answer your question, I would buy the K500050 ball joints and bushings and press them into the original arms. The age old saying of “You get what you pay for” is certainly true here. It made my replacement a breeze! I just replaced my tie rod ends with Moog problem solver ball joints and I am impressed. Home. Moog uses an OE equivalent replacement bushing that would basically restore the arm to “factory fresh” if the original is worn out, but they don’t offer a Problem Solver version of that bushing. the bushings are coming apart. Polyurethane is resistant to heat, road chemicals, other oils, and UV rays. Just walk the internet. Anyway, I was as baffled as you were about a CK part not having the Problem Solver ball joint installed so I got in touch with a tech at Moog. If they’re sagging, cracked, or hollowed out it would be a good idea to replace them since you’re already changing out the ball joint. The first set I thought maybe was a defective part except both sides were the same. 2302(C)). It is a high-quality suspension part that is crafted to meet the daily demand of your driving. I find the marauder fun to drive so I’ll admit I push it at times so my goal would be to have the better quality arms. Based on a lot of recent discussion in the last decade or so, there have been catastrophic failures from OEM strut rods {In this case, the “strut rod” is a solid bar threaded at one end for a MOOG K8207 bushing set, and the other end is bent with a pair of holes for being bolted to the lower control arm.} I am pleased with this purchase and would recommend it. Parts Steering Suspension Driveline Wheel End. I have very nasty torque steer now. Super product which was a direct bolt in as advertised. WHERE WAS IT MADE. Both MOOG and the supplier I used list the RK arms as the value line and the CKs as the premium line. This is merely a precautionary statement. The OEM arms don't have zerk fittings, should this be a selling point? Fortunately, the story doesn’t end with “Moog introduced a cheaper part to compete with cheaper parts”. Then once the defective part is on it’s way back to us, we will have Moog send out the replacement part. They do NOT have the Moog Problem Solver ball joints installed in them and do NOT have grease fittings. Have you purchased Moog parts before? If you feel comfortable renting a press and installing the ball joint yourself you can save some money on top of the lower price for parts. VortecJeep Powered by Uranium-235. I’m just going to thank God along with you that your kid is ok and wish you both well as you look for a wheel hub. Or if you’d like to call or live chat our amazing customer service team they would be happy to answer any questions you may have. Given the price difference I would get the R-series. Be on the lookout for these initials in the MOOG product catalog. I am redoing the entire front suspension (minus shocks and coil springs – I think) with CK/K heavy duty Moog parts all around (notably, my vehicle has the heavy duty 4000# axle). In summary, they are 100 percent garbage, a waste of money and should be avoided. Moog offers the CK series arms which have the higher quality ball joints installed, but they are more expensive. For Chevy Impala Bel Air GMC G1000 Series Steering Tie Rod End Moog ES370R 080066147116. 2) If so, Is the metal frame of the control arm CK/K-level quality, even though the ball joint and bushing are (most likely) not? It is very difficult to even found those RK versions. First off, sorry to hear about your troubles with those RK control arms. MOOG products are covered by a 1-Year Warranty to be free from defects in material or workmanship. With a little wire brushing and some paint, the original arms should serve just fine as long as they’re still structurally sound. Find Moog Chassis Parts RK620054 Moog R-Series Control Arms and get Free Shipping on Orders Over $99 at Summit Racing! It’s also wear resistant opposed to a rubber bushing which can be damaged after repeated flexing and stretching. Hi, I cannot find the CK/K version of lower control arms RK621655 and RK621656. If you’re looking for something more resistant I would suggest going with polyurethane. Noticed Moog's R-series and Problem Solver series are shown with bolted ball joints that are grease-able. They said that this control arm is actually moving to an RK series because it’s a low-volume part. In short, Moog is definitely not exclusively made in America because they can not provide their immense coverage otherwise. Here is a blog post comparing rubber and polyurethane bushings if you would like some more information. It sounds like you’re putting your vehicle through a lot so you might consider looking at a hardier bushing set. Problem Solver® patented cover plate design allows for tighter tolerances vs traditional cover plate designs, providing a more durable and extended life part. There are pros and cons to both and if you would like to learn more about it head over to our Rubber vs Polyurethane Blog. I will say that for control arm bushings, and related, if the installed is not using the supplied grease or using a grease specific to use with polyurethane material, you may experience squeaking. These parts are not inexpensive. – Suspension.com Think twice before you install it, especially if you gonna pay for the labor (probably x2-x3 the […], Is there a molding difference in manufacture =, rk620718 r-series and ck 620718? My OEM LCA bushing regularly gets oil dripped on it so I’m wondering if they’re both rubber or something more oil resistant? The ball joints were inspected by the owner who is a ASE Certified Advance Level Specialist and ASE Certified Master Technician. Moog problem solver bushings are awesome, a new patented design using a polymer bushing with an internal balljoint to deal with the twisting motion which is what wears out rubber ones. Rock auto has a few different brands (Dorman, Mevotech, MAS, Moog, AC Delco). Moog used to be a solely “Made in the USA” company, but they have since grown and are manufacturing parts for several times as many makes and models as they did originally. All the part numbers on the boxes were verified as correct after checking and rechecking. Get started by selecting your vehicle application. Is there anything else for the front end I'm missing? Browse the forums. Short Answer: R Series is a value-driven replacement part while the CK Series incorporates Moog's premium Problem Solver components for a better than OE upgrade. 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