i tried and it didn’t work… but i had a solution: one year ago i remembered that i had a windows program called minitool partition wizard on one of my hdds that can use to create a windows emergency usb/cd/iso (based on Win PE) that can resize, convert fat exfat fat32 to ntfs and btrf i think and it can also convert a MBR disk to GPT without formatting and he rebuilds grub and windows bootloader and it worked, i also solved the grub junk on all my disks by converting them also in GPT, the grub bootloaders are gone and i have only the manjaro’s one like i wanted it to be 
PS: the program wants to be payed for that function (i cracked it cuz i havent money on the card, i’ll pay later for the latest version it helped a lot in this year, even more than gparted 
)
thats it guys thanks a lot for the help 