Transfer case refers to an important part of the drivetrain of all-wheel and multiple power operated axle vehicles. Transfer cases 231 and 242 work to transfer power from the transmission to the front and back axle. NP 231 and NP 242 both are known as individual transfer cases. Although it seems that both transfer cases are similar, there have several differences between them.
In this guide, we will discuss details on np231 vs np242. Also, we talk about how much power these transfer cases can handle and what transfer case is better for the power transfer process? If you need to know the facts, then stay tuned.
What are np231 and np 242?
NP 231 is a command track-based transfer case that works mainly in the drive mode of the part-time wheel. And it works without any differential. Also, note that 231 is ideal for Cherokee Xj transfer case, MJ Comanche, and YJ Wrangler since
On the other hand, the new process 242 transfer case is the updated version or replacement of the NP228 transfer case. It is suitable for all-terrain like 2WD, part-time 4WD, full-time 4WD and 4WD low range. Also, it is used with XJ Cherokee, Wagoneer, and MJ Comanche.
NP 231 is a command track-based transfer case that works mainly in the drive mode of the part-time wheel. And it works without any differential. Also, note that 231 is ideal for Cherokee xj transfer case, MJ Comanche, and YJ Wrangler since
On the other hand, new process 242 transfer case is the updated version or replacement of the NP228 transfer case. It is suitable for all-terrain like 2WD, part-time 4WD, full-time 4WD and 4WD low range. Also, it is used with XJ Cherokee, Wagoneer and MJ Comanche.
When np 231 and np 242 is Good for the Vehicles?
Yes, NP 231 is good in design and functions. It’s durable, but a simple build increases the value to the vehicle company. Besides, it provides advantages to the OEM assemblers and individual users. Additionally, you will be impressed with the upgradeability, strength, and serviceability. And gearing of an np 231 transfer case.
NP 242 is good for the durable build, versatile T-case installation and a wide range of terrain suitability. Besides, it is good as a full-time transfer case
Main Comparison Between a np 231 and np 242 Transfer Case
| Transfer case | Np 231 | NP 242 |
| Horsepower | 265 hp in the np 22 | 243 horsepower with 242 |
| Engine weight | Lighter, smaller and fuel-efficient | Comparatively heavier, larger and a bit less fuel-efficient |
| Automatic transmission | 145 kilometer/hour speed | 145 km/h speed |
| Manual transmission | 190 kilometer/hour speed | 190 km/h speed |
| payload capacity | About 3 tons | About 1 ton |
| Locking Hub | Np 231 has an external locking hub | NP 242 has no external locking hub |
| Weight | It is at least 150 pounds lighter | It is about 150 pounds weighted than an np 231 model |
| Maximum rpm | 6,800 revolutions per minute | 6,250 revolutions per minute |
| Gear ratio | No multiple gear ratio | Multiple gear ratio option for lower range |
Which Transfer Case is Better Between 231 or 242?
There has a lot of differences between 231 and 242 np. But the main difference is that 231 is a part-time transfer case. When you notice on a NP 242 transfer case diagram you will get a full-time transfer case. So, these are good from different perspectives.
231 np will be a good choice if you need a short time riding. On the other hand, 242 would be good for load hauling and trail riding. Also, note that 231 np has less gear range than 242, but the low torque is few. That is why a 231 np is good for uphill riding.
As you know, the feature of both transfer cases so you can easily decide which is better from which perspective.
Are All NP231 Transfer Cases the Same?
Many often think that all NP 231 cases are similar, but it’s not true. There have different functions in NP 231. And so far, nine functions have been found in NP 231 transfer cases. Among nine, there have five varieties of serial numbers and four individual part number. Each is made to track variation.
Note that the part number is stored in a case of a transfer case. The updated version of 231 has located after the serial number. And each version has recognized with a letter. Here is the whole version of the NP 231 transfer case.
NP231 (1983 to 1989) without locking hub and low gear range options. And NP231A (1990 to 1994) with internal locking system hub and minimum gear reduction. Hence, the 231C (1994 to 2000) with outer hubs and a 2.72:1 and 3.42:1 low range gear reduction. And in those ways, the 231D, 231E, 231F, 231G and 231H has released periodically.
How Much Power Can an NP231 Handle?
Most of the Jeep of 231 np and 242 np can be interchanged with each other. The 231-np transfer case has low torque power and is lightweight. Since there is minimal pressure on the components, it can manage about 265 horsepower in a 4×4 measurement.
Besides, 231 transfer cases can provide more energy power than a 242 transfer case. However, it is recommended not to use a vehicle with that has 250 plus hp with a 231-transfer case. Remember that the latest driveshaft installation is required for operating a vehicle with larger wheels. Also, note that the NP231 transfer case needs 75w140 front gear and 68w90 rear gear.
Are Internal or External Lock Transfer Cases Better?
Generally, external lock hubs are used for basic maintenance and unstuck the vehicle pulling from loose terrain. This locking hub is more reliable than an internal locking hub. Besides, an external hub can work with up to 5 mph. But the drawback is that the external locking hub is less efficient in unstuck a vehicle from dense mud or snow.
This locking hub is mostly used in vehicles that has automatic transmission. The good thing is that there has no damaging transmission risk if the vehicle is stuck with the gears. On the contrary, internal locking hubs are prone to engage at 1-2 mph per hour.
If you want a manual transmission, then choose an internal locking hub. There has the possibility of breaking or damaging axles when someone tries to use an internal locking hub with automatic transmission. Especially, the axle can damage when lacking lubricant and heat buildup.
Will a 231 Fit My YJ?
Yes, the nv231 transfer case would be fit if it comes with only np 242. However, it is essential to change the mounting bracket if you want to fit 231 np. But 92+ wranglers or an XJ can be swapped on each other.
Which Transfer Case Is Better: Internal or External Lock?
First, let’s look at the comparison table of the two types of transfer cases. And then, it will be possible to figure out what type of transfer case is better.
| Differentiate Factors | Internal Transfer Case | External Transfer case |
| Design | Simple | Complex |
| Number of differentials | One | Two |
| Performance | Average | Reliable |
| Purchase Cost | Less expensive | Expensive |
| Repairing cost | Less | Expensive |
| Compatibility | On-road driving | Off-road driving |
Both the internal and external lock transfer cases are widely used in several types of vehicles. But when choosing one, the external lock transfer case will provide efficiency compared to the internal transfer case due to more robust running hubs.
However, there are always some personal preferences that can come into play. For example, the external lock transfer case is way more expensive than the internal one. Someone considering the budget may prefer the internal lock transfer case.
The internal lock transfer case is more affordable to install, and the repair cost is not so high. It requires spending a lot of money installing and maintaining the external lock differential.
But you should go with the most reliable transfer case option, even if it requires some more money. The external lock transfer case is reliable, so you can easily handle off-road driving. Here, the extra differential plays a massive role in ensuring optimal performance for the external lock differential.
Frequently Asked Questions
1. What is the difference between NP231 and NP 242?
NP 231 and NP 242 both are transfer cases. Among these, NP 231 is a part-time transfer case, and NP 242 is a full-time transfer case. Besides, NP 231 model is lighter, smaller and fuel-efficient. But NP 242 transfer case is comparatively larger, heavier and less fuel-efficient than NP 231 model.
2. Is the NP 242 transfer case good?
Yes, NP 242 transfer case is good because of its versatile range. For example, 242 is fairly good in design, durable build and simplicity. Moreover, it is suitable for full-time, part-time and low-range 4WD.
3. How much power can an NP 231 handle?
NP 231 is a powerful, durable, most used transfer case that can handle up to 300 horsepower. It is also well-known as a jeep wrangler tj transfer case. These transfer cases suit these XJ Cherokee, MJ Comanche, and YJ Wrangler vehicles.
Final thoughts
When you compare np231 vs np242, both transfer cases are efficient and great from a different perspective. Remember that 231 is a part-time Np transfer case that has limitations in-vehicle ranges. On the contrary, 242 is a versatile and full-time transfer case.