I had the same issue with a well maintained Adams driveshaft.
Initially i was barely able to separate it by doing like a deadlift with it. After taking it apart i cleaned and greased everything, blue coating had a rough spot all the way around on the lower end of the splines. Putting it back together was not easy, initial entrance was smooth but close to half way in it started resisting to the point where i had to put my weight on it.
Then i thought that maybe something is really sticking to the walls of the other half of ds and it need a good smack to break through, so i smacked it on the ground, it went all the way in, grease is everywhere and that is when it really seized up. After fruitlessly beating it with a hammer and yanking on it with all i had, i tied one end to a tree and other to a Jeep and pulled it apart.
That rough spot in blue coating that goes around the splines makes me believe that there is either a balancing issue, inside of the tube was not properly cut, or somehow inside of the tube with all that grease in there a corrosion started forming.
Eventually i wrote it off as what ever and ordered another set from them... and both ds arrived out of balance. Trying to resolve it with them officially has put an end to me doing business with them.
Initially i was barely able to separate it by doing like a deadlift with it. After taking it apart i cleaned and greased everything, blue coating had a rough spot all the way around on the lower end of the splines. Putting it back together was not easy, initial entrance was smooth but close to half way in it started resisting to the point where i had to put my weight on it.
Then i thought that maybe something is really sticking to the walls of the other half of ds and it need a good smack to break through, so i smacked it on the ground, it went all the way in, grease is everywhere and that is when it really seized up. After fruitlessly beating it with a hammer and yanking on it with all i had, i tied one end to a tree and other to a Jeep and pulled it apart.
That rough spot in blue coating that goes around the splines makes me believe that there is either a balancing issue, inside of the tube was not properly cut, or somehow inside of the tube with all that grease in there a corrosion started forming.
Eventually i wrote it off as what ever and ordered another set from them... and both ds arrived out of balance. Trying to resolve it with them officially has put an end to me doing business with them.