I had a d14 for years.
If you are not an ac man: you need to understand the d14 does not have normal live power transmission.
With Bush hog running you cannot shift from forward gear to reverse gear until the Pto almost stops. This can be a problem.
But otherwise I enjoyed the tractor
Mine would jump out of third going down hill but I lived in the flat lands and that was not a problem it would not jump out pulling. Weak part of trans
d17 did not have the problem.