The 17aa orals bind extremely strongly to SHBG, thus rapidly offsetting E2 and T levels. So, individuals who have a lot of E2 bound up in SHBG, can get gyno symptoms even with non-aromatizing orals like Winstrol and Anavar.
Trenbolone is a whole other story. It likely activates the progesterone receptor directly, and if you’ve been a nolvadex offender in the past then your progesterone receptors are probably elevated.... making this tren gyno problem even worse.
Your safest bet for avoiding gyno is either Masteron or Primo.
-Pp