Black prints jams in fuser

Ok guys been having a very strange phenomena

now when i print anything if there's a majority of black it will get smudgy 

So i tried printing pure black

Opening the galss hitting copy well all hell breaks lose

the paper jams 1/4 of the way into fuser. 

Like really bad

Like it's exccive toner on the paper

I've adjusted the gsm and all that but still the same

I've put the paper (letter 32lb) to the lowest setting 64 gsm and even so it jams turn it up to 120 and liek the paper is melting in the fuser

happens more so than on the larger heavier sheets but it's black is the uisse

installed a new drum

anyone else can assist as to why thyis may happen?

thanks much .