If we have raftng reservations, does that mean we can access the going to the sun park between the hours of 6am to 5 pm without having to have a GTTSR reserved entry pass?

We went rafting and rolled out of the parking lot at 4:57. Still plenty of daylight to make the drive through the park and a few stops

No. We run all of our trips along the outside border of the park. You will need to get a pass or schedule a tour that is inside the park to use GTTSR if you want to drive that road between 6am and 5pm.

No. You don't need it for rafting. You can go before 6am or after 5:30pm.

Glacier rafting company is located in West Glacier. It is before you actually enter the area that you pay to enter the park and have to have tickets for.