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  1. Trailer Hitch Ball Mount
  2. CURT
  3. Fits 2 Inch Hitch
  4. Fixed Ball Mount
  5. Drop - 3 Inch
  6. Rise - 2 Inch
Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount - 7,500 lbs

Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount - 7,500 lbs

Item # C63KR
Our Price: $125.95
You Save: $40.00
Trailer Hitch Ball Mount
Shipping Weight: 12 lbs
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Curt RockerBall with ShockDrop technology provides comfort and control while towing. Corrosion-resistant, black powder coated ball mount measures 8-1/4" from center of hitch pin hole to center of ball hole. Includes anti-rattle kit. Great Prices for the best trailer hitch ball mount from CURT. Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount - 7,500 lbs part number C63KR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (102)
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  • Photos

CURT Trailer Hitch Ball Mount - C63KR

  • Fits 2 Inch Hitch
  • Fixed Ball Mount
  • Drop - 3 Inch
  • Rise - 2 Inch
  • 2 Inch Ball
  • One Ball
  • 7500 lbs GTW
  • CURT
  • Shock Absorbing
  • Steel Shank - Gloss Black
  • Chrome Ball

Curt RockerBall with ShockDrop technology provides comfort and control while towing. Corrosion-resistant, black powder coated ball mount measures 8-1/4" from center of hitch pin hole to center of ball hole. Includes anti-rattle kit.


  • Ball mount with ShockDrop hitch ball lets you hook up your trailer to your tow vehicle
    • Shank slides into hitch receiver on your vehicle
    • Ball provides connection point for trailer coupler
  • Integrated ShockDrop technology
    • Cushioned isolators reduce rattling and vibration for a more comfortable ride
    • Reduces shock loads to the vehicle during sudden braking or acceleration
    • Minimizes stress on tow vehicle's suspension and brakes for extended longevity
    • Virtually maintenance-free with no airbags or bearings to service
  • Fine threads on ball provide tight, strong grip
  • Anti-swivel ball base is constructed of forged steel for dependable towing power
    • Durable carbide black powder coat finish
  • Corrosion-resistant chrome finish on ball
  • Tested for safety to meet SAE J684 specifications
  • High-gloss black powder coat finish on sturdy steel ball mount resists rust
  • Anti-rattle kit stops rattling and prevents swaying of load
    • Threaded pin allows bracket to be tightly installed
    • Constructed from high-strength steel
    • Protected by a durable yellow zinc-plated finish


  • Application: 2" x 2" trailer hitch receivers
  • Gross towing weight: 7,500 lbs
  • Tongue weight: 750 lbs
  • Ball diameter: 2"
  • Shank dimensions: 2-1/8" long x 1" diameter
  • Ball mount length: 8-1/4" from center of hitch pin hole to center of ball hole
  • Drop: 3" from top of inside of hitch opening
  • Rise: 2"
  • Pin hole diameter: 5/8"
  • Limited lifetime warranty

Towing can be brutal, especially when your setup is outfitted with standard, metal-on-metal components. Steel and aluminum can only absorb so much vibration and chucking, so every time you hit a bump in the road, that shock gets transferred to the rest of your rig, leaving it vulnerable to wear and tear. Another unfortunate side effect is an uncomfortable ride for you and your passengers.

Protect your truck and trailer from road shock, vibrations, and rattling - and stay comfortable while you drive - with the shock-absorbing Curt RockerBall hitch ball.

Shock Absorbing ShockDrop Technology

Curt RockerBall with SockDrop Technology

The RockerBall hitch ball features Curt's innovative ShockDrop technology, which is engineered to suppress vibrations and rattling while you're towing. When you hit a bump, the ball compresses around the flexible, polyurethane core. This durable material absorbs excess shock at the coupling point so that it doesn't transfer from the truck to your trailer or vice versa. The result is increased control and comfort as you tow, as well as less wear and tear on your towing setup.

Premium Construction

Curt RockerBall Construction

This hitch ball is built to last with its forged steel construction and durable powder coat finish. The flexible, shock-absorbing polyurethane core withstands extreme heat for long-lasting performance, and the chrome-plated ball resists corrosion.

Curt RockerBall Zerk Fitting

The built-in zerk allows you to lubricate the isolator core when necessary, ensuring quiet and trouble-free operation.

How to Measure Drop on Standard Ball Mount

45050 Curt Ball Mount for 2" Hitches - 2" Rise, 4" Drop - 8-1/4" Long - 7,500 lbs

C69HR Curt Anti-Rattle Kit for 2" Trailer Hitches

40047 Curt RockerBall Trailer Ball w/ ShockDrop - 7,500 lbs - 2"

Installation Details C63KR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount - 7,500 lbs - C63KR

Average Customer Rating:  4.6 out of 5 stars   (101 Customer Reviews)

Curt RockerBall with ShockDrop technology provides comfort and control while towing. Corrosion-resistant, black powder coated ball mount measures 8-1/4" from center of hitch pin hole to center of ball hole. Includes anti-rattle kit.


This all-in-one kit does everything it promises to do. I wish I'd learned about it sooner.


Great product!


So I’ve been wanting the rocker ball for a while now and I’ve finally bought it. I bought the kit and it comes with a regular curt hitch, anti rattle kit, and the Rocker Ball. Construction seems solid on all Items. The hitch did arrived with a small area the size of half a penny of the powder coating chipped. I think it might’ve occurred during transit. Installation is fast BUT and a big BUT is very difficult to keep the rocker ball aligned to the hitch while you are torquing the nut. Mine ended up being noticeable sideways when I finished torquing it. I had to try it a couple of times and even then I couldn’t torque it all the way without 1. The rockerball assembly going sideways and 2. Without the tabs on the metal bracket bending.( one corner did bend. Anyways seems like a good product and if you don’t care of the Rockerball not being sorta aligned ( I honestly think that it shouldn’t be of fwhen fully tightened because then the rocker ball is not going to move straight back and straight forward) then I supposed it’s ok... If you are like me that gets bothered by details like this then find something else. I would’ve returned it but I scratched the hitch trying to get the Rockerball sorta aligned. Anyways take my experience with a grain of salt and good luck.


The hitch works great as advertised. A great company to deal with along with their prices.

Michael L.


As if it was still new. Great product.







This hitch ball works great no slamming back & forth when stopping are starting. Just the right height for my F150 with a 4 inch curt drop receiver. I would definitely purchased again. Ran it with an unloaded trailer & a trailer with weight around 2500 lb. You want be disappointed in the purchase.


I just purchased a new hideaway hitch system. But the hitch sits only 15 inches off the ground at best. And, my trailer coupling is 22-23 inches off ground. So l needed 7-8 inches of rise on the new 1.25 inch receiver system.

Internet research took me to etrailer and the Brophy hitch. I got 5.5 inches with the Brophy hitch, the highest available for a 1.25 inch receiver I could find. The others are limited to 5 inches max. I added another 1.5 inches with your Curt shock absorbing hitch. Voila, with a combined 7 inches of rise and on level ground the trailer now rides perfectly level!!!! Both parts were very easy to connect.

Delivery was speedy. Thank you for saving the day and my investment in an expensive new hideaway hitch!


Greatest difference is felt with a full trailer vs empty. For reference, I haul a 3700 horse trailer and with one or two horses on board, this makes a noticeable difference in the reduction of ‘jolts’ when road seams, potholes are encountered. No noticeable difference when empty, but I am rarely empty. Good value for outcome.


I received my order one day late but everything turned out good and I already tried out the ball hitch and lock assembly and seems to tow pretty good so far


Somewhat disappointed in Curt with this product and I have always been a big Curt fan. The first one of these I ordered was the listed 3" drop unit. The base of the rocker ball is almost 1 7/8" tall so on a 4 inch drop ball mount its really only a 2 inch drop hitch so be aware when ordering. I had to send the first back and reorder the larger drop unit. When I received the larger drop unit I put it in the receiver like many other hitches I have used and proceeded to properly torque the ball down. Because the rocker ball has a pivot point its very important that it stay parallel to the receiver. Curt includes a sheet metal plate that shims in between the ball mount and the ball to prevent it from turning. The plate is no where near strong enough though and at 224 ft/lb the plate bent and the ball rotated. After the plate is bent it is almost impossible to get he thing torqued down right and lined up.


Drove from San Diego to Alaska - smooth ride w/trailer...


love using the rocker ball


Kimberly, our Sales rep, was incredibly patient and amazing and guided us through our options and availability. The products arrived on time and as expected. In a world of choices you all went above and beyond any expectations.


Like most any lock they can be a little temperamental after being out in weather a while, but a shot of lock lube or WD40 takes care of that. "Training the lock to your given key is a breeze, and I definitely like the convenience of not having to try and recall which key is needed to use them!


Just received it. I haven't had a chance to use it yet, but the quality is excellent!


makes for a better ride for sure !!


Fast Service. Excellent quality


We have a small trailer pulling behind an SUV. This really cuts down the rocking as we drive.


I thank it is everything that it should be. Works great


Works great, it's a noticeably smoother ride than other hitch balls I've used.


Received product before due date however, both our WD Hitches do not have the standard piece to allow the Anti-Rotation Plate to be useful. Pictures attached.
Checking with etrailer to see what can be done before modifying either the ball or the hitches. Only other issue was packaging, it was well packed on bottom side but not on top which allowed the product to distort the box it was shipped in but it did come fully in tact with no visible harm. Mentioning this for future delivery of such items.

Show More Reviews

See what our Experts say about this CURT Trailer Hitch Ball Mount

  • Can Curt Rockerball be Used with Surge Brakes on Trailer
    The Curt Rockerballs like the # C63KR will not interfere with your surge brakes. The movement they allow would not prevent the inertia of your vehicle applying the brakes from activating your surge actuator.
    view full answer...
  • Recommended Ball Mount That Eliminates Rattle For My Jet Ski Trailer
    When it comes to eliminating rattle while pulling your light weight trailer The Curt RockerBall Anti-Rattle Towing Kit - 2 inch Ball - 8-1/4 inch Long Mount - 7,500 pounds # C63KR will get the job done for you. The ball mount has a high-gloss black powder coat finish on a sturdy steel ball mount that helps prevent rust. The mount has a threaded pin which allows the bracket to be tightly installed and helps stop the rattling and prevents the swaying while hauling loads. The mount has cushioned...
    view full answer...
  • What Ball Mount Comes with Curt Rockerball Ball Mount Kit with 3 inch Drop C63KR
    The ball mount that comes with the # C63KR has a 3 inch drop but since you already have the ball all you'd need is the ball mount of the kit which would be part # C93KR. The Rockerball is not available with a 50 mm ball size.
    view full answer...
  • Shock Absorbing Hitch Ball Mount Compatibility
    The Curt Rockerball Shock Absorbing Hitch Ball has anti-Rotation Plate that is not compatible with all hitch mounts. This hitch ball is recommended to be mounted onto standard ball mounts not shock absorbing ones. I recommend the Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount item # C63KR.
    view full answer...
  • Compatibility of Gen-Y Glyder Shock Absorbing Ball Mount With Surge Brakes and Lower Tongue Weight
    There will be no issues with using surge brakes along with the Gen-Y Glyder Shock Absorbing Ball Mount for 2" Hitches - 6" Drop - 7K # 325-GH-12005. Also, the Glyder can be used with a lower tongue weight and an empty trailer. The only problem is you need to be at the 4-700 lb range in order to benefit from the built-in shock absorption. If your loaded tongue weight is going to be 250-300 lbs then I would not recommend using this ball mount. Instead, I would recommend the Curt RockerBall...
    view full answer...
  • Gen-Y or Curt RockerBall For 300-400 lb Tongue Weight in 2 Inch Hitch
    For your tongue weight, you are right about the Gen-Y Glyder like # 325-GH-12001 not being the best option as that requires a tongue weight of at least 400 lbs to reap the benefits. So for your tongue weight below that, I recommend the RockerBall for the best shock absorption. The Convert-A-Ball and its polyurethane interior won't give you as much cushioning as the RockerBall (which is not compatible with the Convert-A-Ball or other cushioned ball mounts), which is why I like it more....
    view full answer...
  • Can The Curt RockerBall Be Used With Convert-A-Ball Shock Absorbing Ball Mount?
    I personally spoke to Curt who informed me their Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047 should not be used with the Convert-A-Ball Ball Mounts including # CAB-UM. For the best experience I recommend using a ball mount with the correct amount of drop with the RockerBall and a anti-rattle. This will eliminate the play between the ball mount and your receiver allowing the RockerBall to absorb the trailer shock. We have a couple kits which have all the parts listed below otherwise...
    view full answer...
  • Is There a Curt RockerBall Anti-Rattle Towing Kit with 2" Ball and 3" Drop
    It sounds like you are looking at the Curt RockerBall Anti-Rattle Towing Kits but wanting one with a 2" hitch ball and 3" drop ball mount. If that is the case then you will just need to use part # C63KR. In regards to the Convert-A-Ball Ball Mount like part # AMSCV-2, they both use a polyurethane bushing to reduce shock. The benefit however of the RockerBall is that it can be lubed so it will ideally last longer and reduce noise more.
    view full answer...
  • Shock Absorbing Hitch Ball with 1-1/4 Shank and 2-5/16 Ball for 2 Ball Mounts
    If the trailer requires a 2-5/16 ball, you don't want to use the 2" ball to pull the trailer. The 2-5/16 ball has a larger shank so it is not interchangeable with the Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount - 7,500 lbs Item # C63KR I recommend Curt RockerBall Shock Absorbing 2-5/16" Hitch Ball - 1-1/4" Diameter Shank - Chrome - 12K Item # C29FR and Curt Solid Ball Mount for 2" Hitches - 3" Rise, 4" Drop - 10" Long - 12K Item # C45313. It will give you the extra...
    view full answer...
  • Recommended Ball Mount for 2017 Ford F-150 with 16.5" Coupler Height
    In order to choose the correct ball mount you'll need to measure from the ground to the top inside edge of the trailer hitch and then subtract the distance from the ground to the bottom of the trailer coupler while level. If this is where you measured from then you'll need around a 3" drop. The Curt RockerBall Anti-Rattle Towing Kit part # C63KR or B&W Tow & Stow 2-Ball Mount part # BWTS10033B are excellent options for this.
    view full answer...
  • Recommended Locking Hitch Pin For Curt RockerBall Towing Kit # C63KR
    The Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount - 7,500 lbs # C63KR you were looking at has a 2" hitch ball with a 7500lb towing capacity, and for a locking hitch pin you can use the etrailer Trailer Hitch Receiver Lock for 2" Hitches # e98880. This will replace the anti-rattle hitch pin and plate, so for an anti-rattle device you can also add the etrailer Anti-Rattle Hitch Stabilizer # e99007 to keep the hitch from rattling in your trailer hitch receiver. I included...
    view full answer...
  • Comparing Gen-Y and Curt Shock Dampening Ball Mounts
    It sounds like you are trying to get the best hitch mounted suspension for your vehicle to not transfer the shock. The Gen-Y Glyder Shock Absorbing Ball Mount for 2" Hitches - 2" Drop, 3-1/2" Rise - 7K # 325-GH-12001 will absolutely work better for that based on design than the Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 8-1/4" Long Mount - 7,500 lbs # C63KR. Both will absorb some shock with the dampening technology.
    view full answer...
  • Will Gen-Y Glyder Ball Mount Work With Boat Trailer
    Yes, the Gen-Y Glyder Shock Absorbing Ball Mount for 2" Hitches - 2" Drop - 7K # 325-GH-12001 will work with a boat trailer like your Shoreland'r. For a hitch ball use 2" Hitch Ball # 40038 and for a lock use Trailer Hitch Receiver Lock for 2" Hitch # e98882.
    view full answer...
  • Curt RockerBall and Convert-A-Ball Compatibility With A 5,000LB Boat Trailer
    The Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047 cannot be used with a shock absorbing ball mount like the Convert-A-Ball Ball Mount # AMSC2. It can also not recommend by Curt to be used with surge brake couplers. I recommend using a standard style ball mount with a anti rattle hitch pin for a trailer that does not have a surge brake coupler. This can be found in a kit like the Curt RockerBall Anti-Rattle Towing Kit # C63KR. Remember that the RockerBall adds 1-1/2" to your receiver...
    view full answer...
  • Availability of Ball Mount With 3 Rise/Drop
    I'm not 100% sure what you need here but I will assume you're looking for a ball mount for a 2" hitch that either has a 3" rise or a 3" drop. If you need a 3" drop we have the Curt RockerBall Anti-Rattle Towing Kit # C63KR which has a 3" drop exactly or the TowSmart # TS64FR with a 3-1/4" drop which won't be an issue. If you're looking for a 3" rise you can use the Curt # C45313. This doesn't come with a ball so you can use the # A-90 for a 2" ball or # 19286 for a 2-5/16" ball.
    view full answer...
  • Selecting a Cushioned Ball Mount Capable of a 3" Drop Which Fits a 2" Hitch Receiver
    I have a few options depending on the amount you will be towing and how adjustable you want to hitch to be for other trailers. First is the Curt RockerBall Anti-Rattle Towing Kit # C63KR. This uses a standard style ball mount with a cushioned 2" hitch ball. This will be set at the 3" height and is not adjustable but is the most economical of the choices. The Gen-Y Glyder Shock Absorbing Ball Mount # 325-GH-12005 is a cushioned mount. It does allow you to bolt the bracket from a 0-6" drop...
    view full answer...

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Info for this part was:

Employee Andrew K
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