Reman topshaft from Abilene machine

Are the reman top shaft assembly a good or bad assembly
has any one had good or bad luck
I am going to buy one and drop it in .

I suspect this is for a JD 4020, you have had several posts on here concerning trans repairs on that model. It would be useful if you included the model you are working on in every thread you start. No direct experience with a reman top shaft from Abilene machine but as I?m sure you know they are well known and move a fairly large volume of parts. I did however split a 4440 for a farmer I was working for during my mid-life 2nd career training so he could swap out the top shaft with a used one from A machine. Split it one day, he insisted he put the shaft in so he did. Came back he had it buttoned up ready to put back together. During assembly I noticed some growling when ever I moved the gear train. Sure enough before I had it completely together I convinced him something was not right. I jacked up a rear wheel and spun it grrrrr it went. Turns out the shaft he had installed was from some other model synchro range not the quad in this tractor. The gear teeth only engaged about halfway. I not sure how he didn?t notice it wasn?t right while he was installing it. Not a big surprise he was sort of loose canon when a wrench was in his hand.