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Ace Frehley did the impossible ... bringing his former bandmates back together to celebrate him at a private funeral held earlier this week in the Bronx.

Eddie Trunk -- a well-known radio DJ and close friend of the band for many years -- shared a summary of the intimate affair ... as well as a photo of what looks like Ace's grave marker.

The plaque has Ace's full name written out with the dates of his birth and death sitting above the Bible verse John 14: 1-3, 27 ... which reads, in part, "Let not your heart be troubled, neither let it be afraid" ... so, it sounds like Ace is trying to provide comfort even though he's gone now.

Trunk says it's been an emotional couple of days for everyone ... but adds it was nice to see people in Ace's world he's known for years -- former KISS

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