Basically, in the idea I am having, Transformers are the Zords. The equivalent of Optimus Prime is both Zordon (trapped normally) and the Megazord (the only time he has a body which he can control, with him normally being trapped).
There'd be a synergetic partnership between the Transformers/Zords and their human Power Rangers.
The Rangers in this case are justified as older teens to young adults by the process that empowers them being too hard on a body that has finished growing, since the powers granted are such that they are outright lethal to a body that can't grow to handle them with time. So, no trained professionals. It needed to be people old enough to know how to fight but young enough to not die. And they were ideally a friend group with pre-existing coordination.
In this case, the Rangers have standard sets of Ranger powers. Vastly enhanced strength (still exists partially outside of suit), enhanced speed (ditto), vastly increased durability (with the suits providing even more), analytical powers (and a danger sense when out of suit), and built-in comms. They also have a standard-issue pistol that actually is useful.
However, beyond that, each Ranger has a unique power bestowed upon them, a more magical one that they can use even when not morphed. These are superpowers, things that are enhanced in their Ranger form but which they innately have thanks to their empowering process.
Each Ranger has a Transformer paired with them. These Transformers usually take the form of, well...cars, but transform into combat forms. Each transformer has two, a humanoid one and a non-humanoid one. They can only use the humanoid one when their Ranger is inside of them though. The Mega-Zord/Optimus Prime requires each transformer to be a part of it and each Ranger to contribute to piloting it.
Transformers have technological weapons, but require a Ranger in order to use their magical upgrades.
Transformers can transform on their own, but also respond to the commands of their pilot, their associated Ranger. The Rangers transform by use of a watch, which also acts as a built-in comms device and can refine their searches, acting like their visor does when transformed.
The idea is still young in my head, but that's the basics of it.
It'd have the original base 5 colors, but with Black as the leader rather than Red. (It'd have Red Yellow Blue Pink tho.) Later, it'd have two join (separately), as Green and White Rangers. The Black Ranger's power is considered the strongest, being a combination of a darkness shroud and a shield (a forcefield). This shroud can cut, but being a hero, is mostly used to defend others by obscuring them, shielding them, etc. It also has a side-effect of allowing for a flash-step, carrying the Black Ranger along on the magical darkness.
That's all I've got so far, but obviously, this idea could evolve further.