Clunk in transfer case (1 Viewer)

[76 PTO]

Hi guys,

I was driving my 76 fj40 the other day when I noticed a clunk. I was concerned so I limped home.

I got the rear end up on jack stands and chalked the front tires. I started it and put it in 4th gear. I noticed a clunk for every rotation of the output shaft. What do you think is the cause of this clunk? Ive heard of them whining and growling, but not a clunk. The only time it does not do it is when the trany is in neutral. The case has oil in it, and the u joints look and feel good. Im going to drain the case and see if I lost preload on the output nut and the input shaft nut. Any suggestions????

Thanks,
Eric

 

[Weber Sarge]

Have you checked the driveshaft flanges and see if the bolts are tight ? Also , spin each rear wheel seperately and note if there is any catching or "notch" feeling , broken spider teeth will do the same thing .
Sarge

 

[shawnfj40]

It sounds like you have already figured out that you need to look inside the transfer case to identify your source. Do not overlook the tcase housing and mounting bolts first.