Cannot tighten, Replacement is the only fix for loose transfer case chain.
How do i change the chain out of my 1998 mercury mountaineer transfer case
To change the chain in the transfer case of a 1992 Suzuki Tracker, first, safely lift and secure the vehicle. Drain the transfer case fluid and remove the transfer case from the vehicle by disconnecting it from the transmission and any associated mounts. Open the transfer case, remove the old chain, and replace it with a new one, ensuring proper alignment. Finally, reassemble the transfer case, reinstall it in the vehicle, and refill with the appropriate fluid.
chain drive
The transfer case has a linkbelt chain (here's a picture of one like it) http://www.autopartswarehouse.com/details/QQDodgeQQRam_2500QQCloyesQQTransfer_CaseQQ19941998QQCT10025.html
with bolts and tighten
how do you tighten a chain on a 150 ATV
The Transfer Case chain is located inside of the transfer case. The transfer case is the gearbox located just behind the transmission. It sends power to the front wheels when 4-wheel-drive is selected. To remove the transfer case chain, the transfer case must be removed from the truck, by removing the front and rear drive shafts and unbolting from the transmission (also various connectors for speed sensors, if equipped). The two halves of the transfer case cover housing must be split by removing all the bolts, and several spring clips must be taken off. Unless you have worked on one before, you may want to have the pro's work on this.
The chain must be replaced, cannot be fixed. If you are able to remove and split the transfer case, the chain replacement should be easy for you. You may also want to replace the clutch plates and spacers if you are already in there. If you have never removed and opened a transfer case, you may want to consult this wiki again to ask about the procedure...
how to tighten the front chain axle
How do you tighten chain on polaris predator 500?
the viscous is located inside the transfer case... you need to pull the transfer case out and split it open. While you are there you might as well throw a fresh chain and bearings into the transfer case as well.
How do you tighten chain on 1995 kawasaki ninja zx6r