Despite repeated promises to the contrary, the MTA is passing on having an outside review of the wisdom of Gov. Andrew Cuomo’s plan for L-train repairs. So much for the gov’s claims that the agency doesn’t jump when he says “frog.”

Yes, the MTA board voted Wednesday to hire third-party experts to monitor safety and environmental issues in the ongoing work. But no one’s verifying that this scheme is actually superior to the long-planned one that Cuomo pre-empted.

It probably is better, and L riders are ecstatic at the switch . . . though they don’t yet have a taste of the disruptions the repairs will inevitably bring.

Yet the simple fact is that NYC Transit chief Andy Byford had initially vowed that he would have the new plan vetted, until he was overruled by board Chairman Freddy Ferrer, who clearly said the board would do the hiring.

What of his repeated comments like “a third-party team will be engaged to report to the board and me, all of us, on what the best path forward is” and that the whole board would be involved in “evaluating information and making choices”? Ferrer now says his words got taken out of context, or else he misspoke. Did the dog eat his homework, too?

So the MTA will now proceed with methods previously untried in New York that will close only one L tube at a time on nights and weekends. Valid or not, any concerns of the agency’s own engineers and board members will be ignored.

In short, the gov’s control of the board is more than adequate to ram this through without outside review. So why exactly does he want the board “blown up”? Why is he looking to take it out of the loop when it comes to spending the added funds he wants from new “congestion-pricing” tolls?

Tolls, by the way, that he wants the Legislature to OK without even knowing how high they’ll go, among other key details.

Plainly, Cuomo is bent on cutting off any avenue for dissent, real oversight or basic transparency. Lawmakers need to find the spine to tell him “no.”