View Full Version : NP 229 ??? need help
I've junked my old 44 and upgraded to a full width axle. Anyone know how to trick or manipulate the transfer case into working properly without having the vacuum line connected to the axle?? Is it worth it using this t-case? I'm not very familiar with the 229, is it a decent t-case? Any assistance would be appreciated!
04-30-2003, 02:15 PM
you just need to plug the lines that went to the front axle. I "think" that should do it. Then you just got to run manual hubs up front... that should do.. GOOD LUCK!
COOL, I'LL TRY THAT AND SEE HOW IT WORKS! THANKS..
05-01-2003, 02:28 AM
You do not need to run the Manual hubs, since the NP229 is a full time case.
I think I'm confused?? The 229 is fulltime? There is a switch near my dash to go from 2wd to 4wd..I already have manual hubs installed..Will this be a problem?
05-01-2003, 03:09 AM
no its not a full time as a normal full time case would be, but....... You need to be real sure your T-case is never put in 4 wheel with the Hubs unlocked, or it will ruin the T-Case. The NP229 was equipped with the continous hubs or the disco front axle. Never really a manual Part Time case. However it does have the 2 wheel drive selection and can be run as a part time case, as long as it never gets put in 4 wheel without the hubs locked. Sorry for the confusion
05-01-2003, 03:14 AM
If you run it in 4wd with the front hubs unlocked, you will blow out your $350 viscous coupler.
Full-time means that in four-wheel drive, you can run it on hard-pavement as well as on low-traction surfaces. Hence, you can drive in 4wd all the time, hence "full-time". It does NOT mean that you can't shift out of 4wd into 2wd, as you can on your Selectrac. The fact of the matter is, however, that some transfer-cases with a full-time 4wd mode also include a 2wd mode, though they don't have to in order for you to drive the truck on the street.
Part-time means that in four-wheel drive, you can only run run on low-traction surfaces, and not on hard-pavement. Hence, you can't drive in 4wd all the time, hence "part-time". Of course, with such a system, you ALWAYS need a 2wd mode to be able to shift into to drive it on pavement.
Our FSJ Quadratrac systems have both 4wd Hi Full-time and 4wd Part-time (e-drive on the BW QT, "4wd Lock" on the NP QT system), and the BW QT with the low-range also has a 4wd Lo full-time mode.
Your Selectrac has three modes, plus Neutral:
4wd Hi (full-time)
4wd Lo (part-time)
05-01-2003, 03:18 AM
Find a jeep NP-208 and be done with the worrying.
Ok i got it now..That makes perfect sense to me..Will simply plugging the vacuum lines from the t-case allow me to still use it? I swapped the axle out to a full width hp rc 44..Also in the future am I better off swapping to a different t-case?
05-01-2003, 04:01 AM
You can plug the lines and it will work. I removed the hard line manifold and played with the remaining 3 lines till I got it to work with te transfer case. The np229 is not the strongest case but it will work but like they said NEVER run 4-hi without the front hubs locked. You can however run 4-lo with the hubs unlocked creating the affect of 2-lo. I do this quite often to reduce strian on my steering cause I am welded (locked) front and rear.
OK SOUNDS GOOD. AFTER I PLUG THE LINES THAT ORIGINALLY WENT TO THE AXLE, WILL I STILL ENGAGE THE 4 WHEEL DRIVE BY USING THE SWITCH LOCATED IN THE CAB( 2W/4W SWITCH NOT THE LEVER ON THE FLOOR)?THANKS!!
05-01-2003, 05:15 AM
If you keep the 229 yes you will still have too.. The vaccum switch engauges the axle AND the t/c. So now with the front lines pluged you will ONLY be doing the t/c. The reason I said to have manual hubs earlier was so the your front D-shaft doesn't spin when you are driving down the road just incase you have a bad angle which might cause some vibration problems...
Right now I am the exact opposite of your set up. I have the vaccum axle and the NON vaccum T/C.
[ May 01, 2003, 11:16 AM: Message edited by: SLOwag ]
Alright, thanks guys! I think I've got enough info to go do some damage now...
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