But I tell you truly, there are some standing here who will not taste death (rapture) until they see the kingdom of God." (Luke 9:27 and Mat 17:28)

This is referring to John who saw the vision in Revelation, but is also a reference to those who will not taste death in the rapture. 
Behold, I show you a mystery: We shall not all sleep; but we shall all be changed, in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.

How people can say "there is no rapture" anywhere in the Bible I will never understand.
Now about (like, as it were, as if) eight days after these sayings he took with him Peter and John and James and went up on the mountain to pray. And as he was praying, the appearance of his face (body) was altered, and his clothing became dazzling white.
Now Peter and those who were with him were heavy with sleep (dead a long time), but when they became fully awake (resurrection) they saw his glory and the two men who stood with him.
And it came to pass, as they departed from him, Peter said unto Jesus, Master, it is good for us to be here: and let us make three tabernacles; one for thee, and one for Moses, and one for Elias: not knowing what he said.
As he was saying these things, a cloud came and overshadowed them, and they were afraid as they entered the cloud.  Luke 9:27–34

The we which are alive and remain shall be caught up (raptured) together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.  1 These 4:17

And after six days (6000 years) Jesus took with him Peter and James, and John his brother, and led them up a high mountain (large nation, aka Babylon) by themselves.  Mat 17:1
Matthew (and Mark 9:2) says "after 6 days", which is different from Luke who said about 8 days. Technically both can be true because 8 days is after 6 days, but to be consistent 8 days is the only interpretation one can use that makes Matthew, Mark, and Luke true. I think the reason one verse says after 6 days, is because we are raised after 6000 years from creation, on the 8th day.
The reference to a "high mountain" could also be a reference to Babylon because mountains are a symbol of nations.
Again, the devil took him to a very high mountain and showed him all the kingdoms of the world and their glory.  Matthew 4:8

And he was transfigured before them, and his face shone like the sun, and his clothes became white as light.
This verse creates a connection to the sun, or sunrise, and the woman from Revelation who was clothed with the sun, who was given fine linen bright and pure to wear. The connection to the woman clothed in the sun is also a connection to the 7th month during Tabernacles because that is when the sun is in Virgo.
… voice (like trumpet) from the cloud said, "This is my beloved Son, with whom I am well pleased; listen to him." When the disciples heard this, they fell on their faces and were terrified. But Jesus came and touched (grabbed, attached to, "raptured") them, saying, "Rise (resurection), and have no fear." And when they lifted up their eyes (your redemption draws near), they saw no one but Jesus only.
Summary
The Transfiguration is a vision of the rapture and resurrection of the dead. First Moses and Elijah (the dead rise first) are standing with Yashua, then the disciples awake (those who are alive and remain). This verse mentions the 8th day and Tabernacles and collectively the Gospels imply "after the 6000 years". Our bodies are changed and our clothes become bright white and he tells us to rise and have no fear as we are caught up in the cloud with him.