Lost 4WD!

[Panther]

Ok, I'm not sure when it happened but I've been stuck in the snow twice because something is wrong with my four wheel drive system and the front is not receiving power.

I'm not sure where to start so I'm starting here http://www.ifsja.org/ubb/smile.gif I know all was working well a couple of months ago because I tested the part time on this little trail need my friends house.

IFSJA site only has the schematic of the vacuum and not any tech stuff on the problem:http://www.ifsja.org/tech/tcase/pictures/seltrac.gif

This is a 88 GW but I'm not sure the tcase. Any advise would be GREATLY appreciated cause I'm TIRED of getting stuck when I shouldn't be!


------------------
88 GW stock
82 Scrambler
84 CJ7

[BobBarry]

<BLOCKQUOTE>quote:</font><HR>Originally posted by Panther:
Ok, I'm not sure when it happened but I've been stuck in the snow twice because something is wrong with my four wheel drive system and the front is not receiving power.

I'm not sure where to start so I'm starting here http://www.ifsja.org/ubb/smile.gif I know all was working well a couple of months ago because I tested the part time on this little trail need my friends house.

IFSJA site only has the schematic of the vacuum and not any tech stuff on the problem:http://www.ifsja.org/tech/tcase/pictures/seltrac.gif

This is a 88 GW but I'm not sure the tcase. Any advise would be GREATLY appreciated cause I'm TIRED of getting stuck when I shouldn't be!

<HR></BLOCKQUOTE>

You have the NP229 Selectrac transfer-case. 2wd/4wd mode is switched via a dash-mounted vacuum switch, and the "4wd" light in the left gauge pod should shine when it's properly engaged. The 4wd High/Low range is selected via the floor-mounted manual lever; this should not be able to move unless 4wd is engaged through the dash switch.

Now, that's how things are *supposed* to be. If you throw the switch, and your 4wd light comes on, and you can shift into low-range, but your front shaft is not getting power in 4wd-Hi, then either the viscous coupler in your transfer-case is bad and allowing all the power to go to the rear wheels, or somebody has swapped-in an NP228 with the open center differential.

If the light is not coming on, then you either have problems with the vacuum source (the resevoir ball on the firewall above the engine, or the lines to the switch, or the lines from the switch down to the transfer case) or with the actuator freezing up from corrosion. I generally set mine in 4wd in October, and don't think about putting it back into 2wd until April, so that I don't have to crawl underneath in this cold snow.

I can attest that a properly-operating NP229 should *not* get stuck in snow; with this weekends snow, I got to drive through some 2'-3' drifts on the side of the road. I could stop in the middle of one facing uphill, and then get going again with only moderate throttle.

So, start with the dash-light/no-light diagnosis, and work from there.

------------------
Bob Barry<UL TYPE=SQUARE>* '78 Cherokee 4-door
* '88 Grand Wagoneer[/list]http://studentweb.providence.edu/~rbarry/wheels/

[scotty]

can you get it into 4lo? you prolly have a 229 xfer,and if its not in 4wd it wont go into low.if it wont go,you are likey stayin in 2wd which may be a bad vaccum doohicky,or rotted/disconnected vaccum lines.

if it does go, you may have some sort of axle trouble.start by putting the rear on jackstands and watching the front driveshaft while the rear is spinning in 4wd,preferably in 4lo,since low range is supposed to be mechanically locked,like a real live part time case.

if the front shaft is spinning,and look at the front axle u joints to see which ones are spinning. if they are both spinning,you have manual hubs which are unlocked http://www.ifsja.org/ubb/smile.gif just kidding.if you have a spinning u joint,you may have stripped splines on the outer stubshaft or the full time drive flange.if the front shaft is spinning and neither u joint is moving,pull the front diff cover and see what falls out, your front end is broke reaaaall gooood.

if your front driveshaft will not spin in 4lo,dont know exactly what to tell ya,you have some sort of internal xfer case trouble. if the front shaft does not spin n 4hi,this is not nesesarily bad-the power could simply be floating thru the center diff to the rear,tho a viscuous coupling in good shape should move the vehicle,causing it to fall off the jackstands,so be careful.

hope this helps you out some. if it makes you feel any better,prolly 9 out of 10 times a no 4wd prollem in a 229 is vaccum related-either lines or the stuppid shift motor doohicky.



------------------
scott
85 grand wagoneer
258 with motorcraft 2bbl/904/twin stick dana 300/dana 44/welded amc 20
38x15.5 gumbo mudders
snorkel/dual batteries/onboard air/"custom" convertable
3 inch body lift/mostly stock suspension/"modified" fender openings
custom front/rear bumpers and brushgaurd

T18/dana-spicer 18 with drum E brake and PTO,and offset dana 44 swap very soon
BIG tow truck PTO winch and full roll cage install shortly thereafter
searching for jeep 4.0 six engine

now we can do some 'wheelin!

[Panther]

Sorry for the lack of detail....

I have never seem the 4wd light come on and have never been able to shift the floor shifter, stuck in 4HI.

From what you said I should check my vacuum source, "the resevoir ball on the firewall above the engine, or the lines to the switch, or the lines from the switch down to the transfer case". What do I do just check the lines to make sure everything is ok and conneted there?
What's the actuator?

Thx Lee

[Panther]

Sorry for the lack of detail....

I have never seem the 4wd light come on and have never been able to shift the floor shifter, stuck in 4HI.

From what you said I should check my vacuum source, "the resevoir ball on the firewall above the engine, or the lines to the switch, or the lines from the switch down to the transfer case". What do I do just check the lines to make sure everything is ok and conneted there?
What's the actuator?

Thx Lee

[ClarkGriswald]

If you are not seeing the 4x4 light. Then I would say there is a damm good chance that the shifting levers are just rusted solid,, mine was exactly as you describe when I got it in june. I had to get under there and hose down the levers on the T-case with Wd40 and work the selector lever (one hooked to the vac motor after unhooking it) with a large pair of square jaw vice grips. After much prying (also had wheels jacked up off the ground and tranny in neutral for free movement of the whole drivetrain).. I finally got it to move. With continued prying and squirting of wd40 I managed to get it to work just fine.

This was the first time I saw my 4x4 light come on.. and the beers flowed..

I still think the only good thing about fulltime 4wheel is that you can drive it anywhere and not worry about binding the case.. aside from that I hate it with a passion..
I never had my driveway plowed all winter on purpose to check it out.. During the heavy snow in december I was shifting into low range (partime) to get in and out cause the fulltime just throws power wherever it wants and not where I want it.(to both axles equal).

Anyway now I pissed myself off hahahah..
Check the linkage its probably frozen shut.

------------------
88 Grand Wagoneer
D44's front\rear
Warn 20990 Lockouts
AMC 360
TF 727
NP 229--Soon to be replaced by an NP208 that currently inhabits my kitchen.

"I came, I saw, I typed some stuff!"