ok ive done most of the basic tune up in my 85 gsl , now all that is left is the tranny and diff . Today i tried to loosen the tranny filler bolt but it seemed to be really hard to remove . never had this problem before , i dont wanna force to break it loose because iam afraid to strip the square bolt . any suggestions?

 

Heat and PB blaster. it is a 3/8" square FYI

 

Tranny fill plug takes a 14 mm open end wrench. Preheating will help, but don't get carried away, it's a steel plug in aluminum threads.