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  1. Trailer Hitch Ball Mount
  2. CURT
  3. Adjustable Ball Mount
  4. Fits 2-1/2 Inch Hitch
  5. Drop - 11 Inch
  6. Two Balls
Curt Deep Drop Adjustable 2-Ball Mount - 2-1/2" Hitch - 11-3/4" Drop - 20K
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CURT

Curt Deep Drop Adjustable 2-Ball Mount - 2-1/2" Hitch - 11-3/4" Drop - 20K

Part Number: C89NR
In Stock
$425.95
Retail:$560.95
You Save: $135.00
Trailer Hitch Ball Mount
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This steel, adjustable ball mount lets you tow up to 10,000 lbs with the 2" ball or 20,000 lbs with the 2-5/16" ball. Can be positioned in up to a 11-3/4" drop position. Fits 2-1/2" x 2-1/2" hitch receivers. Great Prices for the best trailer hitch ball mount from CURT. Curt Deep Drop Adjustable 2-Ball Mount - 2-1/2" Hitch - 11-3/4" Drop - 20K part number C89NR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (36)
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  • Videos (2)
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CURT Trailer Hitch Ball Mount - C89NR

Highlights

  • 20,000 lbs GTW for Big Loads: Handles heavy campers, boats, or equipment trailers with the 2-5/16" ball.
  • 11-3/4" Drop for Level Towing: Adjusts height to keep varied trailers level and stable.
  • Dual Ball Setup for Versatility: 2" (10,000 lbs) and 2-5/16" (20,000 lbs) balls cover multiple coupler sizes.
  • Adjustable in 1-1/4" Increments: Fine-tunes trailer height without swapping mounts.
  • Anti-Rattle Design for Quiet Hauls: Cuts hitch noise and vibration while towing.
  • Corrosion-Resistant Steel Build: Black powder coat and zinc balls stand up to road salt and weather.

Features to know about

Keeps Every Trailer Level: Adjustable Drop Up to 11-3/4"

When your trailers all sit at different heights, keeping them level can be a chore. This adjustable mount makes it simple. The shank slides into a 2-1/2" x 2-1/2" receiver and lets you set the platform in up to an 11-3/4" drop position. The 1-1/4" hole spacing gives you fine height control, so you can match your coupler height quickly and tow level every time.

Handles Heavy Loads: 20,000 lbs GTW with 2-5/16" Ball

For big jobs like equipment or large campers, strength matters most. This mount is built from heavy-duty steel and is rated for 10,000 lbs gross towing weight with the 2" ball and 20,000 lbs with the 2-5/16" ball. The dual-ball design also covers different trailer coupler sizes without swapping mounts. Each ball locks in place with included pins for secure towing under heavy loads.

Cuts Down on Rattle: Anti-Rattle Shank Design

No one likes the clunk of hitch noise on the road. The anti-rattle shank tightens up the connection between the receiver and ball mount to reduce vibration and towing noise. It keeps your setup steady and quiet while hauling heavy or light trailers alike.

Built to Last: Corrosion-Resistant Coating That Holds Up

Road spray, salt, and weather can wear down any hitch over time. This setup uses a black powder coat on the steel shank and yellow zinc on the trailer balls to resist corrosion and keep it looking sharp after many miles. It’s a durable mount you can count on season after season without worrying about rust or wear.

Doubles as a Weight Distribution Shank

If you’re running a weight distribution system, this mount pulls double duty. The shank has the same 2-1/2" width and 1-1/4" hole spacing as a standard weight distribution shank, so it’s ready to pair with your setup when needed. One solid piece of gear handles both jobs without extra hardware.

Specs

Application

  • Application: 2-1/2" x 2-1/2" trailer hitch receivers

Weight and Capacity

  • Gross towing weight (when used with 2" ball): 10,000 lbs
  • Gross towing weight (when used with 2-5/16" ball): 20,000 lbs
  • Tongue weight (when used with 2" ball): 1,000 lbs
  • Tongue weight (when used with 2-5/16" ball): 2,000 lbs

Dimensions

  • Maximum drop: 11-3/4"
  • Distance between vertical adjustment holes: 1-1/4"
  • Pin hole diameter: 5/8"

Warranty

  • Limited warranty: 1-year

45939 Curt Deep Drop Adjustable Trailer Hitch Ball Mount with Dual Ball - 2-1/2" Shank - 20K

Installation Details C89NR Installation instructions



Video of Curt Deep Drop Adjustable 2-Ball Mount - 2-1/2" Hitch - 11-3/4" Drop - 20K
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Let’s Check Out the Curt Deep Drop Adjustable 2-Ball Mount

Hello everybody, this is Jeff here at etrailer.com. Today, we're gonna take a look at this CURT deep drop adjustable two ball mount for a 2 1/2 inch hitch. Has a 20,000 pound gross towing weight capacity. Now one note is for this video, if you notice, I do have it installed in this 2 1/2 inch hitch display just so we can demonstrate how this operates. Now basically this ball mount has a dual ball platform so to let you hook up your trailer to your tow vehicle. The shank right here you can see is what'll slide into the 2 1/2 inch hitch receiver and the balls will provide the connection point for your trailer coupler.

If you notice on the ball mount shank here, it has multiple holes in it. That'll give you an adjustable height so to let you tow trailers of different heights with the same vehicle. The distance between those adjustment holes center to center is 1 1/4 inches. Now if we put this ball mount in the very lowest position and then measured from the top here to the ball platform, it's gonna give you a maximum drop of 11 3/4 inches. Now this is the drop position.

This is not intended to be used in the rise position. Basically you can slide this ball mount up or down along the shank, secure it in place with the included pins and the vibration resistant clip, and you're all ready to go. Basically this clip is designed to install on both pins and I did want to demonstrate that 'cause it is a little tricky if you're not familiar seeing this before. But basically what you'll do is you can see how it's installed on the top and hooks around the bottom. To release it, you just pull back on it and then just you can slide the clip right off the top pin and then your clips are moved.

And then you got your two pins here that you can slide right out and then move your ball mount, switch to ball size or move it up and down for whatever height you need. And then when you go to reinstall the vibration resistant clip, all you gotta do is hook it onto the top pin just like that, pull it all the way, push it down there and then just put a little force on it until it clips into place. And you can see it's got a nice tension on it to keep those bolts from rattling. Now this does offer a nice deep drop so it is ideal for larger lifted trucks and SUV. We did mention the two different size hitch balls that will let you tow trailers with different coupler sizes.

As you can see now, the one in the up position is the two-inch diameter ball. If you flipped it over, you could use the 2 5/16 diameter ball. And to switch them it's pretty easy 'cause it's the same way. Remove your clip like we did before. Once you got your clip out, what I'm gonna do, slide out the bottom pin, slide out the top pin, and look that out. You can see the ball mount is released and then you could just flip it over, put it back in there, use the larger ball or put it in what height you need for your application. So it's very easy to switch around. Now the ball mount by itself can be used as also a weight distribution shank. Now this does offer an anti-rattle design to help reduce the towing noise. And the way they do that is if you look on the inside of the ball mount here, you'll see a rubber bumper. It's a rubber dampener. So when you go to put this on, let's go back to reinstall this, and we'll go ahead and line it up, put our pin through. And then you'll notice when you push down, there's a little that rubber dampener. You push down to put that second pin and it gives you a rubber contact in there. So it's not metal to metal. It gives you a rubber dampener there to help eliminate some of the noise also. And then again, we'll just take our clip, pull it down there, and you're all ready to go. Simple as that. This is a high strength Ford Steel construction. Has a durable carbide powder coat finish on the ball mount. And the balls themselves are a yellow zinc plated finish to help resist rust and corrosion. Now up here, if you notice I do have the pin and clip in there that's holding it in place. Now that pin and clip is not included. You would have to supply that. It's a standard 5/8 inch diameter pinning clip. Or you could even use a hitch lock for extra security. But again, they're not included. We do sell those separately. Application again fits a 2 1/2 inch by 2 1/2 inch trailer hitch receiver. Now the gross towing weight capacity is gonna vary depending on the ball size you use. If you use the smaller two-inch ball, 10,000 pound gross towing weight capacity, 1000 pound towing weight capacity. If you flip it over, use the larger 2 5/16 diameter ball, 20,000 pound gross towing weight, 2000 pound towing weight. And then the last thing I want to show you is if we can just move this around a little bit, if we measure from the center of this hitch pinhole to the center of the ball is gonna be 14 1/4 inches. But that's gonna do it for a review on this CURT deep drop adjustable two ball mount for a 2 1/2 inch hitch. Has a 20,000 pound gross towing weight capacity.

Customer Satisfaction Score:

Ratings & Reviews

4.8

36 reviews
5 Stars
(33)
4 Stars
(2)
3 Stars
(0)
2 Stars
(0)
1 Star
(1)
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by:
Shipping and packaging was great. The hitch was overcoated so the locking pins I bought from you wouldn’t fit. I had to sand the holes for the pins would go through to hold the balls. Then the 2.5 receiver end was too small for the third pin. I was under the assumption that three pins all keyed the same would be one to attach to the truck and two for the ball attachment. So I had to buy aggressive sanding disks and another locking pin that would fit the receiver section to the truck due to the hitch diameter being to small. These products (hitch& pins) should have been a simple 5 minute installation and it was a few hours and phone to ask for direction
by:
Great drop hitch, shipped very fast, super pleased with it
by:
This hitch is exactly what I wanted and is a nice chunck of forged steel. It was well packaged and arrived with no damage. It was easy to attached the hitch ball and lowered it enough to fit my utility trailer. The instructions for measuring how much drop I needed was right on the money.
by:
Exactly what I needed. Just as described. Built solid! Made the mistake of trying to install ball attachment pins on the floor. The anti rattle bumper has to compress alot before pins will fit. I slid the hitch into the receiver for more leverage and they went in no problem! Thanks etrailer.
by:
I haven't used it yet, but fits as expected. Enough drop for anything I might tow with my 2500HD ZR2, including an 1-7/8 utility trailer (with an convert-a-ball ordered separately), or bolting on the W/D head I already own.
by:
It leveled out my ATV trailer very nice
I have a lifted truck and needed the longest drop you had
The only thing I am disappointed in is the pin system
While the pins are heavy duty the securing system sucks.
by:
Super Heavy Duty!! Everything came quickly and I'm sure it will meet all my towing needs.
by:
Works grest
by:
Heavy duty
by:
It is perfect - just what we were searching for!
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Hitch had the drop and capacity I needed for my car hauler trailer. Works great!
by:
This drop hitch is a beast! Fits good and all holes line up. Seems to be made very well.
Lm C. profile picture

Lm C.

7/12/2025

After one year, I’m very pleased with the workmanship and quality of this hitch. 2 thumbs up!

by:
really well-built, great design. have a 14k# trailer that requires a heavy duty hitch like this.
by:
Love the hitch and especially the way it looks. Also love the east of flipping the ball over. The spring clip pin holder is great and quick to use although I have racked my knuckles a few times getting it off. I only have 2 minor complaints. One is the chrome ball is rusting already but. It could be related to the corrosive deicer they use on Montana winter roads but they are not supposed to use it anymore. Second is the receiver shaft seems a little wobbly in the receiver.
by:
This product is super heavy duty and works well for towing multiple trailers that I own.
by:
Very well made.
by:
Great product. It's was just what I wanted. Really well made.
by:
I like the hitch, it works great
by:
Fast delivery, great follow up.
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See what our Experts say about this CURT Trailer Hitch Ball Mount

  • Can The Curt MV Weight Distribution System Be Used With Curt Deep Drop Ball Mounts?
    Congrats on the new job, Todd! You can definitely use the Curt Deep Drop Adjustable 2-Ball Mount - 2-1/2" Hitch - 11-3/4" Drop - 20K # C89NR and Curt Deep Drop Adjustable 2-Ball Mount - 2" Hitch - 10" Drop, 9" Rise - 15K # C49NR with your Curt MV Weight Distribution System - Round Bar - 10,000 lbs GTW, 1,000 lbs TW # C17052. The MV uses a standard shank (the # C17100 to be specific) and the Deep Drop ball mounts are actually used as weight distribution shanks very often. We actually have...
    view full answer...
  • Recommended 12" Shank for a Trailer Life 10k WDS
    Hey Pyper, assuming the Trailer Lift WDS you mention uses the standard 1 1/4" hole spacing, the Reese Weight Distribution Shank for 2" Hitches # RP69FR would work great. This ball mount measures 12 1/2" long, has a 1.2K tongue weight capacity, and has 9 adjustment holes. If you have something different, need something else, or this won't work for you, please feel free to drop a comment and let me know!
    view full answer...
  • What Adjustable Ball Mount Does the Curt Heavy-Duty Dual Ball Attachment C29NR Fit?
    I didn't see a order number so I am not sure what Curt adjustable hitch with a 2-1/2" shank you have. The Curt Heavy-Duty Dual Ball Attachment item # C29NR you were looking at fits a couple of different ball mounts that Curt makes along with most weight distribution shanks so long as they have the standard 1-1/4" spacing between pin holes. I have listed some below: Curt Adjustable 2-Ball Mount item # C79NR Curt Deep Drop Adjustable 2-Ball Mount item # C89NR All weight distribution shanks...
    view full answer...
  • Locking Hitch Pin Recommendation for Curt Deep Drop Adjustable 2-Ball Mount - 2-1/2" Hitch
    To lock the Curt Deep Drop Adjustable 2-Ball Mount - 2-1/2" Hitch # C89NR I recommend the following: - InfiniteRule Hitch Lock for 2-1/2" or 3" Hitches # IR36FR This kit gives you a way to lock the ball mount to your hitch receiver as well as the platform to the shank so your whole ball mount is properly secured. On top of that the hitch pins have a stainless steel construction so they will hold up really well to the elements.
    view full answer...
  • Can Curt Deep Drop Adjustable 2-Ball Mount be Used as Weight Distribution Shank
    The width is 2-1/2 inches, the hole spacing is 1-1/4 inches, and you can 100% use the Curt Deep Drop Adjustable 2-Ball Mount # C89NR as a weight distribution shank. The reason for that is because the shank that comes with the # C89NR is the Curt Weight Distribution Shank for 2-1/2" Hitches # C17132. Weight distribution shanks are interchangeable as well, so you can definitely use this with your Reese weight distribution hitch.
    view full answer...

Do you have a question about this Trailer Hitch Ball Mount?


Info for this part was:

Employee Andrew K
Installed by:
Andrew K
Employee Jeff D
Installed by:
Jeff D
Employee Lindsey S
Edited by:
Lindsey S
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Carrie F
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Employee Jonathan Y
Video by:
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Employee Ryan F
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