On my 32 active thunder with 500 hps do i have to pull the motor to change the engine coupler.

More than likely, yes. It may be possible to just unhook everything and slide the engine forward enough to change. Probably just as easy or easier to just pull the engine.

I seriously doubt you will have enough room in a 32 AT to slide the engine forward enough. You will need to remove the bellhousing and shield and anything else on the back of the engine in order to access the coupler. Take advantage of it and replace or clean other items while you have the engine out. Good luck.
Eddie

pull engine to make it easier on yourself....