The Joint Service Transcript can give you an idea of what rates/mos translate into depending on school and desired degree pathway. A lot depends on the school, and what the JST recommends for awarding credit.

The good thing about JST is that it can give you an idea of what credit you'll receive at certain schools that are military friendly and cooperate with awarding credit for military service based on your specific training.

I tell you this as an ET (non-nuke) who had to explore his options at the end of his enlistment and considered going back to school. All I can give you is an example of what I looked up:

The closest to mechanical engineering I could find was a program at Old Dominion University, called BSET General Engineering Technology (Electromechanical System). It told me that this program was 120 semester credit hours, and my training translated to 24 ME 1 technical base, and 9 ME 2 technical elective credits.

In other words, I would still need to complete 87 semester hours to attain this degree (which itself wasn't exactly an ME degree.) This meant that I still had to take ALL of my general education courses, and ALL of my prerequisites like college algebra, precal, calculus I, physics I & II, and all of the major engineering courses like: fundamental of electrical technology, engineering management, dynamics, fluid mechanics, etc. Ultimately, I opted to choose a different path and didn't pursue this degree.

Best of luck.