I am doing the KDP prevention on my 2000 dodge ram but I am wondering about the damper does it have to be reinstall in a specific way or direction?

I would mark it and clock it the same.With the crank seal, replace that for sure.Now get one from cummins.They have a plastic ring that comes with it thats a install tool.The seal on the cover was kinda hard to install but i got through it.

Nope, just bolt er back up. The B series cummins is internally balanced. The dampner just takes up some of the harmonics that can cause annoying vibrations.

cool guys thanks I will finish it tomorrow ,to tighten the bolts behind one of the gears how do I rotate the engine ?

Stick 2 bolts into 2 of the 4 damper bolt holes opposing each other, so if you were to number them, put the bolts in holes 1 and 3, then put a breaker bar or something in between them to bar the engine over. Obviously you will have to leave the bolts out a little bit. You might try and find 2 longer bolts with the same thread so if you bend the bolts doing this, it won't matter. It won't always bend them, but it can, and if you used the damper bolts, now you have 2 bent ones.. You can also get a flywheel barring tool that goes into a little hole on the bell housing and uses the flywheel teeth to bar the engine, this is the preferred way but you have to buy the tool to do it.