stang23456

When changing back to 2 wheel drive from 4x4 it always doesn't go in right away. It goes into gear fine however At times, I'll be driving and I will hear a bang noise and it then goes back to 2 wheel drive. Any ideas ?

Lowrange2

Shift linkage doesn't sound like it's adjusted right.

Whens the last time you checked the fluid in the t-case?

cruiser54

Shift it like this and your problem will go away:

Here's how the factory suggests you shift the transfer case and I've been doing this since these things were new and I worked at the dealership. Quoted from the owner's manual.

"To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed". I let off the gas, throw the lever and then tap the gas and let off.

4L position: " To engage, slow the vehicle to 2-3 MPH , shift the transmission to Neutral, then shift the transfer lever to the right and pull firmly rearward to 4L".

stang23456

So shift the transfer level to 4H while in drive ?

cruiser54

Re-read the instructions.

weebur

Although the NV231 is a good medium duty transfer case it has a design flaw in that you HAVE TO reduce your forward speed to about 2-3mph then (on a flat surface) move the shift lever from 4H to 2H. I always double check to see if 4H is disengaged (even though the lever is in 2H position) by turning slowly from lock to lock while moving.

That bang you hear/feel is the transfer case slamming back into 2H...not good. Take your rig out and practice getting it right before you break your chain.

Gee oh Dee

stang23456

Ok so I keep in drive when switching to 2h to 4h and back ? I thought vehicle had to be in neutral when switching ??

Gee oh Dee

Not necessary on our NP231 tcases.

Lowrange2

?


You can shift from 2Hi to 4Hi and back to 2Hi running 60 mph down the road...

You need to be in neutral to shift to 4-LO.

Exactly how Cruisers instructions say.

cruiser54

I'm doubting he's read them.

stang23456

Ok. Is it safe to put in 4h or low while running on pavement ?

9294Forrest

NO slippery or loose surfaces only...

XJ's with SELECTRAC with full time 4wd can drive on pavement with 4x4 no harm.

stang23456

Not what I meant. I meant when shifting to or from 4h or low

Lowrange2

If you can't drive on pavement with it 4wd then why would you shift into 4wd while on pavement?

Just be in the dirt when you shift and you won't have to worry about it.