No! Dynaman was originally released in 1980, and the concept of the 6th ranger didn't come about until "Maskman" came out in 1987, and even then it still wasn't until "Zyuranger" came out in 1992 that the 6th ranger concept became a standard practice!
Here's an idea.. Have you been in PowerRangerEmpire? Register, post your request of the Pre-Zyu series, download it, use Windows Movie Maker and fansub the episode!
A: PRE does'nt want me for some reason, B: I don't know Japanese, if I did why would I need it subbed!!, And C: Even if I did know Japanese I don't have WMM as I use 98
Sorry about that RedRanger2000. I always get those two series mixed up. But in any case, Dynaman was STILL 4 years before Maskman was made, so it STILL wouldn't have had a sixth ranger!
If I wanted to see an episode of "Goranger" so badly, I'd look at the names of the episodes on TV.com and look up Super Sentai under "S" in the action/adventure category and make my own fan-flash animated cartoons based on what I think the episode is all about!
Dynaman was originally released in 1980, and the concept of the 6th ranger didn't come about until "Maskman" came out in 1987, and even then it still wasn't until "Zyuranger" came out in 1992 that the 6th ranger concept became a standard practice! 
I always get those two series mixed up. But in any case, Dynaman was STILL 4 years before Maskman was made, so it STILL wouldn't have had a sixth ranger!