Issues After T-Case Rebuild

[Dzimm]

So I just got the t-case in the XJ back together after replacing the Nylon shift fork pads and the chain.  I took it for a quick drive to make sure everything worked.  It shifts fine and seems to work but it's got a bit of a whining/whiring noise in 4H at speed.  Is this normal after having it apart?  I'm leaning towards it being just new parts wearing in but I wanted to see if any of you guys have experienced anything like it. 

 

The other thing Ive got to figure out is that now my speedo doesn't work.  I marked the location on the case where the sensor was clocked but it's not working.  Is it that sensitive that it has to be perfect? 

[Longview]

So I just got the t-case in the XJ back together after replacing the Nylon shift fork pads and the chain.  I took it for a quick drive to make sure everything worked.  It shifts fine and seems to work but it's got a bit of a whining/whiring noise in 4H at speed.  Is this normal after having it apart?  I'm leaning towards it being just new parts wearing in but I wanted to see if any of you guys have experienced anything like it. 

 

The other thing Ive got to figure out is that now my speedo doesn't work.  I marked the location on the case where the sensor was clocked but it's not working.  Is it that sensitive that it has to be perfect? 

All my Np231s have made some noise at speed in 4H. 88 MJ, 90 Yj, and 04 LJ.

 

As for the speedo I don't think the clocking of the sensor has anything to do with it, I've put speed sensors back in the YJ/LJ a full 180 degrees from where it came out with no difference, I'm not sure about cable driven speedos.

 

EDIT: Actually just did a SYE last night, love those 231s

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[ComancheKid45]

The cable driven gears do have to be in a certain way to work.

 

My rebuilt 231 also makes a slight whine while in 4 hi. As long as it doesn't jump outta 4wd and you have no banging/clunking I wouldn't be concerned.

[Dzimm]

Good to know the noise is normal.  

 

It's an electric driven speedo so I'll double check the plug and pull the sensor back out just to make sure it didn't chew up the gear or something.  

[87MJTIM]

How fast are driving in 4H?  What road surface are on?

 

A 231 is not meant to be driven as AWD. 

[Dzimm]

1 hour ago, 87MJTIM said:

How fast are driving in 4H?  What road surface are on?

 

A 231 is not meant to be driven as AWD. 

It was pavement and at about 30-35. 

I've just never had one make that noise when in 4H on pavement. 

 

I would never use it that way other than to test it, but supposedly the factory thinks they can be.  These cases are designed to engage 4H at like 55mph (owners manuals say it can be engaged at any legal speed).   I would imagine an NP231 would wear out much faster regularly driving on dry pavement in 4H.