transfer case whine

[kgarciactd]

after having the transfer case in my 91 rebuilt it now makes a whining noise whenever it is in 4 wheel drive. it was rebuilt 3 years ago, and since i did not use 4 wheel drive for a while it was not noticed till this year. the fluid has been changed in it. if anyone has any ideas what this might be please help me. i believe it might have whined a little right after the rebuild but im not sure. thanks in advance for your help.

 

[BushWakr - RIP]

For what it's worth, mine has always had some whine when in use... it is more noticable in 4L of course but it is still there in 4H... .

You may be able to change the lube you've used and that may help the noise but unless you are having trouble with the thing, you're good to go in my opinion.



pb... ...

 

[mysteryman]

t/case whine

This is a common complaint... The reason is simple... . The idler/cluster gear in the lower part of the case uses shims to set the tapered roller bearings preload...

If you set them too loose the gear cocks side ways causing the gear tooth contact patteren to be incorrect. The result is it whining in 4wd... . If they are really loose they can even whine in 2wd..... Refer to your factory Dodge service manual for a clearer picture. .

after having the transfer case in my 91 rebuilt it now makes a whining noise whenever it is in 4 wheel drive. it was rebuilt 3 years ago, and since i did not use 4 wheel drive for a while it was not noticed till this year. the fluid has been changed in it. if anyone has any ideas what this might be please help me. i believe it might have whined a little right after the rebuild but im not sure. thanks in advance for your help.

 

[Moab4x4]

mysteryman, you are the dude of the day! I have wondered about that for a long time! My 205 is going to come apart as part of my rebuild and I will check that.

Thanks again,

 

[mysteryman]

t/case problems

One other problem that plagues the NP205 is the rear out put bearing housing... The 307 bearing on the rear output shaft has a tendency to rotate in the tail shaft housing... This causes the bearing's snap ring to dig in and wear a groove in the tail casting and the bearing retainer/seal retainer causing excess axial movement... . The bearing rotating in the tail housing also wears the bore it sits in causing excess radial movement... . To makes matters worse the rear output shaft often rotates in the 307 bearing's bore wearing the output shaft down causing even more radial movement... . This all adds up to a real sloppy output shaft/drive yoke.....

I would also like to add that all 307 bearings are NOT the same! The one we specified to be used had 10 balls in it ... Most have 6 ... . Use the 10 ball 307.



The above problems happen because the truck was run at excessively high speeds for long periods and or it was over loaded routinely by either excessive loads or hauling trailers that exceeded the gvw we posted on the door... .



The 205 was really not heavy enough to have been used behind the Cummins... . But it was all we had and or were allowed at the time to use... .



The T/Case we used in the 60's prior to the 205 was model # 201... .

It was almost exactly the same as the 205 except it had 2 shift rails instead of one... The other was that the rear output shaft's was supported by a Timkin tapered roller bearing instead of the 307 ball bearing that the 205 used... .

The 201 never had any rear output bearing failures! The 205's had them all the time in the heavier gas trucks... The 205 was introduced sometime in the late 60's for the 100 threw 300 series trucks... It was really just a cheaper to assemble and or produce 201... The 205 was used up to 1974. In 75 we changed to the 203 full time chain drive case... That lasted up to 79... For 1980 we had a new case called the 208... The 208 was very light duty and blew apart regularly..... The 205 case was brought back for 89 but just for the Cummins trucks... . But what should have been brought back was the 201



Years ago I took the rear output out of a 201 and put it in a 205 to stop the constant failures in my company truck's output bearing... . I don't remember now how I got it to work but I did some how.....



Good luck with your rebuild

mysteryman, you are the dude of the day! I have wondered about that for a long time! My 205 is going to come apart as part of my rebuild and I will check that.

Thanks again,