Can You Convert An F-250 To An F-350? [Pros, Cons, And How To]

Have you ever wondered if you can upgrade an F250 truck to an F350? For this article, we've thoroughly researched a conversion from an F250 to an F350 and will explore the possibility and know-how.

You can convert an F250 to an F350. There are only a few differences between the F250 and the F350. As a result, conversion is as simple as upgrading a few key parts of your truck.

These are the areas you need to upgrade:

  • The suspension block on the F250 would need to be upgraded from 2 inches to 4 inches.
  • The center section of the rear axle would need to be replaced with the slightly larger differential on the F350.
  • The leaf springs would need to be replaced with marginally thicker springs that come stock with the F350.

This article will go over why you might want to upgrade your F250 to an F350 and go into the pros and cons of converting your F250 to an F350. Plus, we have also included a how-to guide on the conversion process and the benefits of upgrading the various parts. Finally, we will discuss whether it is even worth it to convert between the two. Stay with us!

glossy black pick up truck ford f250, Can-You-Convert-An-F250-To-An-F350-[Pros,-Cons,-And-How-To]

Why Make The Upgrade?

There are several reasons you may want to upgrade between the F250 and the F350. For example, needing to haul a bigger trailer or desiring a smoother ride when off-roading. 

The F250 will have advantages on the road, and an F350 will have advantages for off-road driving and pulling a trailer. The right truck build will depend on what performance and tasks you need out of the vehicle.

If you are driving a great distance across the highway, you will need a slightly different build than hauling a trailer over a mountain trail to a campsite.

What Is The Difference Between An F250 And An F350?

A parked Ford F250 truck with a lift kit, custom wheels and a diesel engine, king ranch edition

The key differences between an F250 and an F350 are the suspension block height, the size of the rear axle center section, and the leaf spring stiffness.

Suspension Block Height


The F250 has a 2.5" suspension block, and the F350 has a 4" suspension block. One of the main reasons someone might want to upgrade the suspension block is to increase the maximum payload.

The larger rear suspension block on the F350 gives it a higher maximum payload of 7,640 pounds. The F250 has a lower maximum payload of 4,270 pounds. 

This is because the taller suspension block allows for a better angle on the rear axle when hauling a trailer or anything else.

Center Section Rear Axle


The center section on an F350 is slightly larger than on an F250. A reason to upgrade the center section is that the slightly larger differential gives the F350 a higher gear ratio allowing it to tow larger weight better.

As a result, making turns while carrying large amounts of weight will be easier. A higher gear ratio gives better torque to the rear axle at a cost of increased gas consumption.

Leaf Spring Stiffness


Leaf springs on the F350 are marginally stiffer than on the F250. With stiffer springs, you should notice a smoother ride, especially when off-road.

Some F250 models come with this option. However, if yours does not, you may want to consider upgrading. The leaf springs are only micrometers thicker, so it isn't a large improvement.


With an improved suspension block, you can be sure your truck can handle a larger tow weight. This could mean less anxiety about towing a heavy trailer.

The larger center section will improve your gear ratio. You will now be able to have the necessary torque to pull a heavy trailer uphill or even over more bumpy terrain.

The improved leaf springs should make any journey on the road or off-road a smoother one. Expect to glide easier in all types of road conditions. 


When you have a trailer attached to your truck, a taller suspension block allows the trailer to sit level with the truck.

When you are not hauling a trailer having the taller suspension block adds no benefit and can even make the rear axle not align with the front axle.

This doesn't have much of an effect, but if you wish to gain a benefit from having a taller suspension block, you would need to be towing something.

The larger center section does allow for better torque when towing but has an associated cost. The higher the gear ratio, the easier it is to pull weight, but the more the gears have to rotate.

This increases fuel consumption. Like switching to a lower gear on a bicycle, pedaling uphill is easier, but you have to pedal many more times.

Now, the leaf springs on the F350 are marginally thicker; they don't actually increase the suspension that much. It is unlikely you would feel much of a difference.

Another disadvantage would be that in some states, the F350 is in a different insurance bracket. This could cause your vehicle insurance to be as high as three times higher when driving an F350 over an F250.

brand new model of ford f350 available at showroom

A How-To On Upgrading An F250 To An F350

While it is impractical to upgrade each part to perfectly match the F350, you can still have the same hauling and suspension power as the F350 with a few upgrades.

Upgrading The Suspension block

This Readylift rear block kit can upgrade the suspension block to a 4" in an F250 or F350 from 1966 to 2014.

You can find it here on Amazon.

To install, you simply lift your truck with a jack and unbolt the stock suspension blocks and replace them with the new blocks.

Upgrading the Rear axle

While you can find some rear axles with a larger differential, they can cost a few thousand dollars and won't increase your torque by much more than it already has. There really isn't a need to upgrade the rear axle.

Upgrading the Springs

The leaf springs in an F250 are nearly identical to the F350. In fact, a lot of F250 models give you the option to have the same springs installed when purchasing.

While you could upgrade the springs it would be very impractical because it is unlikely you would even notice a difference.

The Truth About Upgrading

Only the suspension block is practical to upgrade. The center section on the rear axle and the leaf springs are nearly identical between the F250 and F350.

If you upgraded the suspension block, your F250 would perform at the same level as an F350.

Are The F250 And F350 The Same Size?

The F250 and F350 are the same sizes. There are really only a few specific parts that are different between these two trucks.

Why Can The F350 Tow More?

Ford f350 with Titanium 5th wheel, both are in white. parked on a walkway

The F350 can tow more than the F250 due to several slight differences:

  • The rear axle block
  • The suspension springs
  • The differential

The F350 has a taller suspension block which allows for a better angle while towing weight.

This will increase the tow rating and allows for a higher towing capacity ranging from 12,000 pounds to 3,5750 pounds, depending on the model, according to Motor Trend. This could help with larger tows jobs.

The F350 has slightly stiffer suspension springs to help increase the suspension quality while driving off-road. This can help when towing weight for a long distance.

The differential on the F350 is slightly larger, allowing for a larger gear ratio. Like how a bike on a low gear can climb a hill, a different gear ratio for your differential can improve hauling weight.

These different parts are why the F350 has an advantage for towing larger weights further distances.

Do You Need A CDL To Drive An F350?

You do not need a CDL to drive an F350. The law in many states says you need a CDL to drive any vehicle with a GCVW, gross combined vehicle weight, over 26,000 pounds.

However, this can change depending on the state. CDL Knowledge has a map that will allow you to check out CDL laws in your state.

The F350 has a GCVW of  11,500 pounds. The F250 has a GCVW of 10,800. Neither is anywhere close to being over the GCVW limit needing a CDL to drive.

Ford F-350 display at a dealership. The Ford F350 is available in XL, XLT, Lariat, King Ranch, and Platinum models. Can You Convert An F250 To An F350 [Pros, Cons, And How To]

Is It Worth The Upgrade?

glossy black pick up truck ford f250

Now, when it comes to whether to upgrade your F250 to an F350, there are some things to consider.

The fact of the matter is that the F250 and F350 are very similar trucks cut from the same cloth. They have much more about them that is similar than different.

While the F350 does advantages for hauling and driving off-road, the advantages aren't significant.

Now, if you are in a situation where a specific trailer you need to tow is over the weight limit for an F250 but not over the weight limit of an F350, you may want to consider upgrading just the suspension block to increase the towing capacity.

As far as the differential and leaf springs are concerned, they provide minimal improvement for a large financial investment.

While you could upgrade them if you wanted, it would actually be cheaper to just sell your F250 and buy an F350 instead.

The price difference between the two trucks is usually only a few hundred dollars. Upgrading the differential alone can cost a few thousand dollars.

It is worth looking into what you need the truck to do and decide if upgrading a few parts would be better for you or just getting a different truck.

If you enjoyed this article, check out the links below to explore other posts:

Can An F350 Pull A Fifth Wheel?

Do You Need A CDL To Drive A Ford F350 Truck?

Ford F-350 Super Duty in Negev Desert. Can You Convert An F250 To An F350 [Pros, Cons, And How To]

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