I had a prothane poly mount in an ls1 car with a t-56 6-speed. it used only the center threaded hole with 1 stud with a nut to fasten it to the crossmember. the stud snapped clean off flush with the mount. this mount has 2 other threaded holes. I assume a 4l60e trans uses the other holes? can I use this mount on an automatic ls1 still? didnt want to throw it away if i could give it to a buddy.

 

i would drill it and use an easy out.

 

x2...........

 

I tried and the damn thing snapped off. them easyouts are useless.