CM2250 Rear Structure Leak

[Rawze]

That is usually a clear sign of truck abuse at some point in its life ...

If the engine is worked hard at high torque and lugged a lot .. or someone lets out on the clutch real hard a lot .. that is what causes that rear structure wear that you describe.

As far as fixing it.. would depend on how bad it was.. If its real bad, maybe you need a new one?.. or you could chance it, clean it up real good, and use some aerobic sealant in that area if your feeling risky and are prepared to pull it all back apart again if it does not seal.

(just the beer talkin' - being sarcastic )...
.. Might want to consider also to turn the torque down a bit, + always ensure to drive it in higher RPM's when power is needed (keeping it above 1500+ when a lot of throttle pedal is needed) .. and re-gear the rear ends to fit the application so that it does not have to put so much load/torture on the the engine .. or fire the driver if they are still abusing the truck ..lol

seriously though.. they don't fail like that on their own. Should also likely change the engine mounts out while your at it too.