Herb did pass the time by typing:
> Thank you everybody for the input.
> The t-case has a constant noise at 2 WD, more noisy at 4WD. Doug mentioned I
> might need to adjust linkage, I guess it might not very difficult to do it.
> What if it ia caused by a stretched chain? Anyway to repair?

A stretched chain requires replacement (dropping of the t-case) and is a fairly
involved procecdure. It's hard to damage the chain unless the case has been ran
low on lube for a long time or your turning some serious tires The linkages
usually just create buzzing if they have shifted and are now touching the body.
(if the sound goes away when you put a small amount of pressure on the t-case
shift handle, then it's probably the links)

It's hard for me to get any more ideas without actually hearing it myself.
It could even be a U joint that is failing and sending vibrations back into
the case.

> thanks
> "Herb" wrote ...
>> I was wondering anybody can tell me what kind of fluid used in NP231
>> transfer case.
>> The dealer said ATF+4, Haynes and car parts shop said using Dexon3,Mercon
>> Auto transmission fluid.
>>
>> I already changed the fluid using Dexon3,the noise from t-case is still
>> there. Should I use ATF+3 or 4?
>> It's a 92 cherokee Laredo, 4L Auto.
>>
>> thanks

 

Herb did pass the time by typing:
> Thank you everybody for the input.
> The t-case has a constant noise at 2 WD, more noisy at 4WD. Doug mentioned I
> might need to adjust linkage, I guess it might not very difficult to do it.
> What if it ia caused by a stretched chain? Anyway to repair?

A stretched chain requires replacement (dropping of the t-case) and is a fairly
involved procecdure. It's hard to damage the chain unless the case has been ran
low on lube for a long time or your turning some serious tires The linkages
usually just create buzzing if they have shifted and are now touching the body.
(if the sound goes away when you put a small amount of pressure on the t-case
shift handle, then it's probably the links)

It's hard for me to get any more ideas without actually hearing it myself.
It could even be a U joint that is failing and sending vibrations back into
the case.

> thanks
> "Herb" wrote ...
>> I was wondering anybody can tell me what kind of fluid used in NP231
>> transfer case.
>> The dealer said ATF+4, Haynes and car parts shop said using Dexon3,Mercon
>> Auto transmission fluid.
>>
>> I already changed the fluid using Dexon3,the noise from t-case is still
>> there. Should I use ATF+3 or 4?
>> It's a 92 cherokee Laredo, 4L Auto.
>>
>> thanks

 

Find a mechanic to replace the chain before you also need sprockets.

> Thank you everybody for the input.
> The t-case has a constant noise at 2 WD, more noisy at 4WD. Doug mentioned
> I might need to adjust linkage, I guess it might not very difficult to do
> it. What if it ia caused by a stretched chain? Anyway to repair?
>>I was wondering anybody can tell me what kind of fluid used in NP231
>>transfer case.
>> The dealer said ATF+4, Haynes and car parts shop said using Dexon3,Mercon
>> Auto transmission fluid.
>>
>> I already changed the fluid using Dexon3,the noise from t-case is still
>> there. Should I use ATF+3 or 4?
>> It's a 92 cherokee Laredo, 4L Auto.
>>
>> thanks
>>
>
>

 

Find a mechanic to replace the chain before you also need sprockets.

> Thank you everybody for the input.
> The t-case has a constant noise at 2 WD, more noisy at 4WD. Doug mentioned
> I might need to adjust linkage, I guess it might not very difficult to do
> it. What if it ia caused by a stretched chain? Anyway to repair?
>>I was wondering anybody can tell me what kind of fluid used in NP231
>>transfer case.
>> The dealer said ATF+4, Haynes and car parts shop said using Dexon3,Mercon
>> Auto transmission fluid.
>>
>> I already changed the fluid using Dexon3,the noise from t-case is still
>> there. Should I use ATF+3 or 4?
>> It's a 92 cherokee Laredo, 4L Auto.
>>
>> thanks
>>
>
>

 

Find a mechanic to replace the chain before you also need sprockets.

> Thank you everybody for the input.
> The t-case has a constant noise at 2 WD, more noisy at 4WD. Doug mentioned
> I might need to adjust linkage, I guess it might not very difficult to do
> it. What if it ia caused by a stretched chain? Anyway to repair?
>>I was wondering anybody can tell me what kind of fluid used in NP231
>>transfer case.
>> The dealer said ATF+4, Haynes and car parts shop said using Dexon3,Mercon
>> Auto transmission fluid.
>>
>> I already changed the fluid using Dexon3,the noise from t-case is still
>> there. Should I use ATF+3 or 4?
>> It's a 92 cherokee Laredo, 4L Auto.
>>
>> thanks
>>
>
>