TH400 sprung a leak

[bsalbrig]

I took my truck out this weekend, up until now the truck had a light leak out the transfercase and I was going to get to it eventually. The trans was apparantly leaking back into the transfercase, now it is pouring out where the two join. I used 3gallons of trans oil to get back home. The transmission has 19000 miles on it and it shifts hard and doesnt slip. I need to know if I need to get a full rebuild or just a seal kit. I can get a seal kit for around $35. I really want to put a sm465 in the truck but I dont want to get new driveshafts again.

 

[4bogginchevys]

I would use great stuff instead if a gasket ( let it setup for 30 minutes or so before installing, and a new oil seal for the tranny to transfer leak. Then you shouldn't ever have to do it again

 

[pigfoot63]

Seal kit is easy fix, the front seal on the transfer is a double lip seal.