can some one tell me about the full time transfer case is it in 4x4 all the time or what just wondering?

 

Im pretty sure its based on torque and tire slip. The front spins after the rear loses traction kinda like a limited slip but on opposite ends of the vehicle rather than opposite ends of the axle. It is still in 4x4 all the time though you cant turn it off but you can lock it into 4x4 hi or low range where the front tires will pull without waiting on the rear to slip. Make sense?

 

ya so burn outs are gona be pretty much none

 

pretty much 0 unless you chain your truck to a light pole. Bronco Graveyard (Im pretty sure) sells a conversion kit to make your full time 4x4 part time. If they dont have it keep looking because I know they are available in 2 styles: CHEAP and CORRECT. You know which one you should buy.

 

should i keep it full time or convert it to part time ?

 

The way a NP203 (full time case) works is that in the normal driving mode it will send power to the axle (front or rear) with the least amount of traction by using a differential inside of the t-case. It works much like an open differential in a rear axle... you know how it only spins the tire that spins easiest? With the t-case in normal mode if you tried to climb a very steep muddy hill it is possible to spin the front tires only if they would have less traction than the rear tires. Another thing to do is put the back tires in some mud or on wet grass with the front tires on the pavement... then only the back should spin when you try to "burn out" as long as the back tires have very little traction compared to the front.

It is when you put the t-case shifter into the "Loc" position that the differential inside the t-case will lock and then send equal power to both the front and rear axles.

If you have lock out hubs, it's possible your's is already converted. There are two kits available to convert it to part time, and I'm no expert on either one, but one kit is superior to the other kit.

I don't care much for NP203 t-cases and would rather swap mine for a NP205, but I'm biased because I've had bad luck with the 203 cases before. In my opinion, a conversion kit would only benefit you if you do much street/highway driving... or if you wish to do "burn outs".

 

MileMarker makes two conversion kits. The one with the one piece metal shaft is the superior kit over the kit with a couple crown gears to replace the spider gears in the t case(BUT this case will work if you just won't to covert it to 2wd and not do any hard off roading, b/c it will break when things get rough). Super winch also makes the kit from what I understand, and like previously stated, I'm sure broncograveyard.com.

Along with the kit you will need to install manual locking hubs(I'd recomend Milemarker's, b/c of the great price and strength).
I have a NP203, and wanted to swap it with a NP205, but found out what all I needed, and it just wasn't possible. New driveshafts, adapter, t case, linkage, transmission tail shaft and housing, and new bracket to mount to frame(all really $expensive$).

 

yeah, i swapped out a 203 for a 205 and its not a direct bolt in for sure... from the research ive done i think it will be cheaper in the long run to buy the doubler kit and use both Tcases, and possibly keep the same driveshafts...the 203 is decent, mine got tore up cause the PO drove it in lock all the time and stretched the chain.....if your truck is a daily driver and your concerned about fuel mileage, you might look into the conversion kit or the doubler kit....

 

[hijack] I currently have a converted NP203 in the truck I'm working on. Is there an easy way to identify which style (shaft or gears) conversion kit was used without digging too far into the t-case? [/hijack]

 

The only way I know to tell is seperate the range box from the case, and see if there's a shaft or crown gears.
Unless you can find the receipt from the previous owner in the truck somewhere.(not likely)

 

The PO put lock outs on mine, and you drive around in lock with them locked out, but in my previous trucks, end result in long run is disasterous, good thing he blew the engine in a mud hole rendering it parked. It is the first one I've owned that is tight, you can shift it without special moves, no kicking the shifter and cussing, it's smooth and easy.
Always buy the conversion with the shaft, I read up on people who just got the crown gears, they ended up having to go back in later.
I thought it wasn't a direct swap, I was wanting to run a doubler, but how is this possible using your own drive shafts?

 

I beg to differ on the 205 not being a bolt in upgrade. It is if you're existing T-case is a divorced 203. I have an early 77 highboy that came with a 400 auto, and a divorced 203 full time, and I swapped in a 205. You didn't mention what truck yours is in... maybe its a highboy?

 

funny, yet true fact, ALL MILITARY HMMWV's run NP203 T-cases behind a 6.2L or (newer) 6.5L GM Diesel, with TH400 trans, and believe me, I work on them and drive them a lot, as someone said before, its like an open diff till u engage Hi-Loc or Lo-Loc, then its completely locked INCLUDING AXLES and DIFFS, that last bit is only Lo-Loc, hard as a brick to steer, and in my opinion, with fuel the price its becoming, SWAP IT!!!! besides its much more efficient and easier to handle

 

Tractor Boy, I've seen and talked to people who have converted their's, it fuel mileage wasn't somthing they got out of it(maybe 1/2 a mpg or so, but nothing they noticed). But did say is saved the front end, and made parts like u joints and other thing like that last longer since they aren't always in use.

 

thats why HMMWV's are such a pain in the ****, and because soldiers think they r invincible, also, the bad thing about them and I dunno if its true with our trucks too, but in a HMMWV, if the front or rear diff blows, a cv joint, axle, or driveshaft breaks, it will not move unless its in lock, and if u try to drive it like that, the transfer case makes a ton of funny noises, then EXPLODES!!!!!! thats when I have to get out of my easy chair and get in my wrecker and do some werk, anyway, IF it was me, I'd swap it, but it depends on what purpose u use it for as well, and what u expect to do with it