Most everyone knew however that the drivetrain worked pretty much flawlessly in the UH60/S70 and that sticking it on a big box frame like the S92A was asking for problems, except the accountants running the show at Sikorsky. Maybe the forced redesigns of the MGB put the fear in these people.
Its a common, understandable misconception that the MGB on the S92 is the same as the UH60 since Sikorsky relentlessly trumpeted that line in the late 90's and early 00's to try and give the new S92 an air of demonstrated reliability. Depending on the customer, the 92 was touted as either "totally new ground breaking technology" or "merely an enlarged Blackhawk with all of its proven reliability".
In reality, the transmission of the S92 and UH60 are really quite different, particularly with the lube system and top case.
Interestingly enough, a large multi-year redesign of the S92A MGB (known as the Improved Durability Main Gearbox III) kicked off in the late 2000s but has since seemingly vanished.