1G Cracked coupler (t-case)

[SharonTampons]

Noticed this after disassembling what I thought was a healthy transfer case. Is this a common defect?

Location: t-case input coupler.

 

[bastarddsm]

Holy how in the f***. A+ for effort. Swap the coupler check pattern and preload, run it.

 

[pauleyman]

Is this serious? Hell no dont run that

 

[ThunderChild]

Dang. I feel like shock loading with alot of driveshaft or rear end slip would be a factor? But I'm not well versed in diag for things like that.

Not having a t-case apart personally, is there a separate piece (coupler) from the crown/ring gear?

 

[SharonTampons]

the poll was just for fun.

I’m more curious if anyone has seen this type of failure before. Particularly on a t-case with “OK” spline wear and no slop in the bearings/shafts. I had it on a shelf forever thinking it was a good spare using traditional inspection methods.

 

[ThunderChild]

Personally I wouldnt run that, it's just begging to break under a decent load.

I can't think of anything past what I mentioned before, maybe @bastarddsm or @twicks69 would have a more detailed idea?

 

[twicks69]

toss it.