Topic: Dual Case Leaking from rear output shaft

[RafterTroy]

I have a 99 4runner SAS'd.  I have a Marlin Dual case and love it but i am getting an oil leak from the rear output shaft.  I have replaced the seal numerous times and after about 150 miles it starts leaking again.  I have called in with this issue and Marlin has sent out a "updated" output flange which was polished better.  I am having the same issue despite replacing the output.  When I reinstall the new seal I do it correctly and use sealant on the threads.  What am I missing?

[gnob]

Either your output shaft, shaft bearing or something with rear driveline.

[redneckcustoms13]

Put a dial indicator on the flange without the driveshaft connected. See if the shaft is warped.

[RafterTroy [OP]]

Thanks for the idea Redneck  I twisted a driveshaft off a while back maybe it bent the output.  Gnob new rear end and same problem on old one.  Thanks for the replies gentlemen.

[gnob]

Getting all info in your original post helps....
Id be looking at the output shaft.  I broke a rear pinion shaft once. The force of the DL sagging broke the DL CV and bent my output significantly.
Try the dial indicator on the flange trick.

[Jpeske]

I know this is an old thread but was wondering if you found/fixed

I have a 99 4runner SAS'd.  I have a Marlin Dual case and love it but i am getting an oil leak from the rear output shaft.  I have replaced the seal numerous times and after about 150 miles it starts leaking again.  I have called in with this issue and Marlin has sent out a "updated" output flange which was polished better.  I am having the same issue despite replacing the output.  When I reinstall the new seal I do it correctly and use sealant on the threads.  What am I missing?

the problem? I’m having the very same issue and so far I have added a breath to the back case, replaced the seal, tested for out of round and even shimmed the flange so the seal would land in a new spot and still weeping gear oil from the seal..