Hitch Ball Grease and Where It Belongs

Most of the questions about hitch grease are really questions about noise. A towing rig makes several different sounds, they have different causes, and only some of them are a lubrication problem. Getting this right is worth a few minutes, because the standard response - spray everything - makes two of the three causes worse.

• The hitch ball. The coupler socket turns and rocks on this ball every time you move. Dry steel on dry steel wears both parts and groans doing it. A general-purpose lithium or marine grease, wiped on, is the normal answer.
• The coupler socket. Same joint, other half. Worth cleaning out old grease and grit once a season rather than packing more on top.
• A weight distribution head's spring bar sockets. The bar ends rotate in these under load. Some heads have a grease fitting or an integrated lubrication design precisely because this is where the groaning comes from.

• Friction sway control faces. This is the one that costs people real money. A friction sway bar, and the L-bracket faces on a four-point friction hitch, resist yaw by steel rubbing on steel. Grease them and they slide freely, which is the opposite of the function. Friction, dual cam and four-point systems all depend on this in different degrees.
• The receiver tube and the hitch pin. A light anti-seize on the pin is defensible if you live where things rust solid. Grease inside the tube collects grit and makes an abrasive paste, and it does nothing for the rattle - that is slop, and slop needs a shim.
• Dual cam contact faces. Follow the manufacturer's instruction here; cam systems are specific about it, and generic hitch advice does not transfer.

A greased ball that still squeals, or a coupler that still thumps, has usually told you something: the joint is worn beyond what lubrication covers. That is worth checking properly rather than re-greasing, because a loose coupler-to-ball fit is the failure mode with the worst consequences in towing.

If any of those checks fails, the ball is a consumable and replacing it is the cheapest job on the whole rig. Ball sizes and what each one carries covers the sizing, and the picks below are the usual replacements.

Quick picks

Tap any row to jump to the full write-up. How these are chosen - and what we do and do not claim to know - is published in full on our research methodology page.

#	Product	Best for	Our read	Price
1	CURT 2 in Stainless Trailer Ball (1 in shank, 6,000 lb) If the ball is worn	Replacing a worn or wrong-size ball	Stainless, 6,000 lb, published 250 ft-lb torque	Check price on Amazon→ #ad Affiliate link - we publish no price; Amazon shows the current one
2	CURT Loaded Ball Mount with 2 in Ball (2 in drop, 7,500 lb) If the mount is tired too	One trailer at a known height	7,500 lb, ball already fitted and torqued	Check price on Amazon→ #ad Affiliate link - we publish no price; Amazon shows the current one
3	CURT Anti-Rattle Hitch Pin and Shim (2 in receiver) If the noise is in the receiver	Killing receiver rattle	Takes the slop out of the tube	Check price on Amazon→ #ad Affiliate link - we publish no price; Amazon shows the current one

1. If the ball is worn

CURT 2 in Stainless Trailer Ball (1 in shank, 6,000 lb)

CURT · Best for replacing a worn or wrong-size ball

A replacement 2 in ball on a 1 in shank, rated to 6,000 lb, with a published torque figure of 250 ft-lb. That torque number is the reason to buy a ball from a manufacturer that publishes specs: an under-torqued ball nut is a genuine failure mode.

Published specifications

Ball capacity

6,000 lb source

Ball diameter

2 in source

Shank

1 in diameter, 2-1/8 in long source

Mounting torque

250 ft-lb source

What works

• +Published torque specification, which many balls do not come with
• +Stainless finish survives a boat ramp better than plain zinc
• +Correct shank sizing is spelled out rather than assumed

What does not

• −6,000 lb ceiling is below what many 2 in couplers are rated to carry
• −Needs a torque wrench to fit properly, which many people do not own

Skip it if

Not enough ball if your coupler is rated above 6,000 lb - match the ball to the coupler's rating, not to the hole in your mount.

Check price on Amazon→

#ad Affiliate link - we publish no price; Amazon shows the current one

Raw specifications: CURT’s own page. We earn nothing on that link.

2. If the mount is tired too

CURT Loaded Ball Mount with 2 in Ball (2 in drop, 7,500 lb)

CURT · Best for one trailer at a known height

A one-piece mount with the ball already fitted and torqued, rated to 7,500 lb gross and 750 lb tongue with a 2 in drop. Nothing adjusts, which is exactly why nothing rattles or works loose.

Published specifications

Gross trailer weight

7,500 lb source

Tongue weight

750 lb source

Drop

2 in source

Ball diameter

2 in source

What works

• +Arrives with the ball fitted, so there is no torque step to get wrong
• +One piece means nothing to loosen or rattle
• +Light enough to leave in the receiver or throw in a toolbox

What does not

• −The 2 in drop is the only drop - measure before you buy
• −7,500 lb ceiling rules out heavier trailers

Skip it if

Useless on a lifted truck, where a 2 in drop will still leave the trailer nose-high and the weight on the rear axle of the trailer.

Check price on Amazon→

#ad Affiliate link - we publish no price; Amazon shows the current one

Raw specifications: CURT’s own page. We earn nothing on that link.

3. If the noise is in the receiver

CURT Anti-Rattle Hitch Pin and Shim (2 in receiver)

CURT · Best for killing receiver rattle

A pin plus a wedge shim that takes the slop out of the gap between a 2 in mount and a 2 in receiver. That gap is a manufacturing tolerance, not a fault, and this is the cheapest thing on the whole site that fixes a real, daily annoyance.

Published specifications

Receiver size

2 in, 1/2 in pin hole source

Finish

Yellow zinc source

Status

Superseded by item 22323 source

What works

• +Removes the clunk over expansion joints for very little money
• +Fits in a glovebox and transfers between vehicles
• +No modification to the receiver or the mount

What does not

• −Does nothing about rattle originating at the coupler or the sway bar
• −Listed as superseded, so check the current item number

Skip it if

Not the fix if the noise is coming from a loose ball nut or a worn coupler - find the source first, because a shim will just mask it.

Check price on Amazon→

#ad Affiliate link - we publish no price; Amazon shows the current one

Raw specifications: CURT’s own page. We earn nothing on that link.

1. 1Degrease and inspect the ball, then re-grease it and the coupler socket.
2. 2Re-torque the ball nut to the manufacturer's published figure.
3. 3Wipe grit out of the receiver tube - dry, no grease.
4. 4Clean the friction faces on any sway control hardware with a solvent, and leave them dry.
5. 5Grease the spring bar sockets if your weight distribution head calls for it.
6. 6Check the safety chain hooks and the breakaway cable while you are down there.

Doing this before the first trip of the season catches the two things that actually strand people: a seized hitch pin and a worn coupler. Neither is expensive to fix in a driveway and both are miserable on a shoulder.