Real low idle sluggish when turbo spools up it iis fine

Hi there's this website something like reliable-store and it is very amazing for manual for repairing servicing anything
someone on fixya recommended it to me and I thank him even today

check for seized turbo blade actuator , rotten hoses or solenoid problem for turbo
run fault codes

Very low engine power. Truck would feel sluggish.

Check under hood in power distribution box for one missing for trailer lights, aux. maybe .

Well, Hate to say this to you but your Cummins 24v turbo diesel does not have glow plugs. The fuel temperature necessary for proper ignition is heated by an element inside your fuel filter housing.

sound like a allison problem

Check vacuum pump. Be sure lines are good all the way to to wastegate soleniod. be sure wastegate solenoid has power. Confirm rod is connected to solenoid and turbo wastegate.
Also check all plumbing for leaks.

oil out of the exhaust I would say, worn out.

Yes you can replace the seal.

take off old water pump. clean up area on the motor real good.do this by using a scrapper and cleaning slolvent. when thats all done put hi temp silicon on the block water pump and the put gasket on silicon. let dry for like five minutes. put in on torque bolts to specs.