How strong are these 4x4 transfer cases
 

I have a 2001 Ford F350 4x4 Dual wheel, and was wandering how strong these transfer cases were. Are they as strong as the old 205 transfer cases?

F350mikey,

The NV271/273 transfercase is the strongest transfer case made by New Venture (formally New Process). The Ford NV271/273 is rated for a GVW of 17,464lbs and is used in F250-F550 SD trucks.

The NV271/273 is an aluminum case, chain drive transfer case and has a 2.72-1 ratio.

The NP205 is a steel case, gear drive transfer case and has a 1.96-1 ratio.

I have not heard of any problems with the NV271/273 transfer case in extreme use situations. Some people like the NP 205 better because it is gear drive instead of chain drive. That is more of a personal choice however since many of the monster trucks run chain drive setups with no problems.

IMO you cannot go wrong with either transfer case, i like the NV271/273 a little better do to the lower ratio.

I don't know how strong they are, but I launch in 4x4 when I race the D-boys. I think it is strong. And I have lots of power on my truck, same as yours. Don't worry about it unless you are having a problem with it now.


I try to get the boost up to about 19-20# before I let the break go.

If I do that in 2 wd I will light the tires up.

IIRC, the rated torque output of the Tcase is 7100ft/lbs. Divide 7100 by 3.09 (1'st gear on a Torqueshift) and your engine could output roughly 2300 ft/lb of torque in hi range. Divide again by 2.72 and you would get 844 ft/lb before reaching the output limit of the T/C. Just as an example of it's strength

Well it's sounds like the transfer cases maybe pretty tough, but I cant say much for reverse gear on the 4R100 trans.

why do you say that?

With a stock truck...you won't break it. Much, much stronger than the 205 :-wink

Thanks for the info, these trucks seem heavy aprox 7700 lbs. I pull my toy hauler all over,with alot of winter time mud driving. What type of mods could a person do to the front end to insure you have traction to pull yourself out of sticky situations. Some sort of locking diferential up front, what about Warns premium locking hubs?

You can change to Warn or MM locking hubs as they are better than OEM. As far as front axle lockers, you need a selectable locker ie ARB, E-Locker, Ox-Locker. Selectables are expensive but really the only way to go for a front diff on a vehicle driven on the street.

As long as you have true lock-out hubs, a full time locker (or spool) would be fine. Just make sure you only lock in the hubs when you need them, and unlock them once you're out.

NV271F
 

I need to buy 100 pieces of transfer case NV271F or similar one. Could you give me an indication of manufacturers?

assume you mean sellers and not manufacturers; just google it - many sources show up