Transfer case's strength

[AlexKJ]

Much has been said (and never with a single fact) about the superior strength of the Command-Trac (NV231) over the Select-Trac (NV242)...

Well... I still can't prove otherwise ... but! I have found something interesting in Wikipedia (I know... I know... everybody can write anything blah blah blah...)

Anyway... The article says that the nomenclature of the New Venture Gear transfer cases it's as follows:

NV: New Venture
Number of Speeds/Gears: 1 = High range only, 2 = High and Low
Strength: 1 (low) to 7 (high)
Type:1 = Part time, 2 = AWD, 3 = Electronic shift, 5 = Torsen dif., 6 = Computer controlled wet clutch, 7 = GeroDisc, 9 = Viscous coupling

Soooooo what do you have to say now?... you weaklings! (obviously a j/k)

The real question is ¿do you think this info it's accurate?... I have my doubts... It's says nothing about what stands for the 'OR' in the Rubicon's Rock-Trac (NV241OR) or the 'J' in the Command-Trac HD (NV241J)

 

[LibertyOrDeath]

Then explain the NP205. In theory it should be incredibly weak because it has a 0. Right?

 

[AlexKJ]

Then explain the NP205. In theory it should be incredibly weak because it has a 0. Right?

Easy!... Because the NP205 it's a New Process and the example is valid only for the NV (New Venture)... just kidding... It sounds me fishy from the beginning...

Cheers!

 

[Powerslave]

It has been that way for a while, and Ford uses the same deal, I think most transfer-cases have those digit meanings.

The second number is more like a DUTY indication number, which is kind of the strength of the case, but the correct terminology is DUTY.

It's also here: http://www.jeepforum.com/wiki/index.php/NP231

What about an NP203 for ford? They follow the same type of numbering, but their ZERO means medium duty.

 

[HoosierJeeper]

It is right, internally the 242 is stronger than the 231, but the shift mechanism is a lot weaker...

 

[tjkj2002]

There are about 3-4 different NV242 t-cases and all are labeled NV242 but all are very different.One of those NV242's is very strong,rated at 2 1/4 tons,but is not the one in the KJ and is more commonally known in certain circles as the AMG242 that resides in the H1.The 242 in the KJ is weaker internally then the 231.

The RockTrac 241 is a heavily modified 241 t-case specifically made for Jeep for use in the Rubicon Wranglers,It is 1 ton rated with the 4:1 low range.

The NP205 is about the strongest stock t-case ever made,about 10x's stronger then either the 242 or 231,it's a gear-to-gear t-case.The Atlas t-case was modeled after the NP205 t-case.

The NP203 t-case is actually a different breed,it's 2 separate components,a 1:1 t-case with a doubler bolted to it for a low range.It is common for ********* wheelers to unbolt the doubler from the NP203's and bolt them to a NP205 for a ultra low crawl case.

The NP208 was a common t-case for most GM pickups in the '80's/'90's and is rather weak.

 

[J-Thompson]

The best part of this is I have 2 Jeeps
1 TJ and 1 KJ and neither have an NV T-case
yet they both have NP ,go figure
1 says New Process Gear 231
the other says New Process Gear 242

 

[JeepJeepster]

tjkj, where do you get your info when you say the 242 is weaker than the 231(what are your sources?)? Not saying its not Im just wondering.

Ive never heard of anyone breaking a 242 in a kj.. Heard of the shifter screwing up but thats it.. If there has been failures its not wide spread..

 

[tjkj2002]

tjkj, where do you get your info when you say the 242 is weaker than the 231(what are your sources?)? Not saying its not Im just wondering.

Ive never heard of anyone breaking a 242 in a kj.. Heard of the shifter screwing up but thats it.. If there has been failures its not wide spread..

From NV/NP engineers(they are the same company by the way),Had to learn how to rebuild them when I was in the Marines when the A2 HMMWV's came out and had the AMG242 instead of the AMG218.The biggest reason for the KJ's 242 being weaker is the addition of the 2wd option since all the other 242's do not have a 2wd option and that's why it's rare to see a 242 in a KJ/XJ break since it will shift/forced out of 4wd before it can really break.

 

[HoosierJeeper]

I think NP is the newer name for the same company, New Venture...says in one of my Jeep books, but I'm too lazy to dig it out...

 

[J-Thompson]

To be clear
they are the same company just different divisions
but the T-case itself will have a tag that says NP@#$
IIRC they are both owned by Eaton any way

I just like to point out that while people want to say I have a NV@#$ in my Jeep
they are technically wrong or it would have a tag that said so
there is no such thing as an NV 242 or 231 in a KJ
there are some that have an NV241 ,I think, but this is only a NP231
with a beefed up shaft and chain and it holds a little more oil
but you could easily swap the guts from the NV241 to a NP231
which would be point less as I have seen NP231's hold up to V8 HP

 

[tjkj2002]

To be clear
they are the same company just different divisions
but the T-case itself will have a tag that says NP@#$
IIRC they are both owned by Eaton any way

I just like to point out that while people want to say I have a NV@#$ in my Jeep
they are technically wrong or it would have a tag that said so
there is no such thing as an NV 242 or 231 in a KJ
there are some that have an NV241 ,I think, but this is only a NP231
with a beefed up shaft and chain and it holds a little more oil
but you could easily swap the guts from the NV241 to a NP231
which would be point less as I have seen NP231's hold up to V8 HP

^^^^ He is right ^^^^

You must be registered for see images attach

But screw the 231 and 242,everyone should install one of these bad boy'srockon.gif

You must be registered for see images attach

 

[incommando]

If you consider an LT1 a heavy duty 4.3L V8 (yes, Chevy had 4.3L small blocks)..... than the 241J is a heavy duty 231j. There was a 231J-hd used briefly in Grand Chero's, IIRC. It is not the 241J. Dodge used a heavy duty version of the 241D, which would make it the 231DHDHD if this were true. rofl2.gif The 231 is a 1/4 ton x-fer and the 241 is realistically a 3/4 ton unit. The two cases are different enough that the manufacturer gave them completely different series numbers: 231 vs 241. The slightly beefed up 231 was called the 231hd by the manufacturer while the slightly beefed up 241 was called the 241hd. Obviously there was a reason for this as all four transfer cases existed simultaneously. This info is out there if you want to look it up. Even Wiki o).

If something about a transfer case is taught to every military mechanic than the training manuals/discs/dvds whatever are out there for reference. The info may be 100% correct, but if it is unverifiable....????

I may have missed this but the answer to the question as to the "J": J = jeep version. 231c = Chevy, 231 d = dodge, etc.... Whether official or not, the OR for the Rubicon t-case is said to be for "off-road." The pics of the 241D-HD I have seen lead me to believe that it has the better case of the 241OR but not the 4.0 low range of the OR.

The 208 was a very common transfer case used by Jeep, Chevy, Dodge & Ford. I have 3 in my garage. It was not just a GM utilized case as implied. It is considered a stronger t-case than the 231 and was even used in 1-ton trucks. Jeep chose to use the 208 in the heavier FSJ line instead of the D300, which it limited to the 1/4-ton CJ line. It had a major weakness in that it hung too low. It also wasn't as "smooth" as the later 231, which was more & more a requirement due to the "sissification" of the traditional 4wd purchaser.

The NP205 was a fantastic case and so was the D20. The sissification mentioned aboved doomed them due to their weight and "rough" ( but much stronger) gear-to-gear power transfer versus the quieter and smoother (but weaker) chains. Ya can't have mommy's 4x4 making a whinning noise from the case when it is in 4wd because a flurry was spotted...