I'm putting my np231 together after the input upgrade, and it just won't quite fit. I had everything together except the output tower (whatever it's called), and realized that last c-clip snap ring thing wouldn't go on! So after cursing I tried to pull the shaft out a bit because all I needed was about 3/16 more till the clip's little valley was exposed. Gave it lots of love, but nothing will budge it. Wondering if I should put the ATF in, it that'll lubricate all the gears enough to budge it. I REALLY don't want to take it all apart. Took me all of today just to clean and reassemble. Anyone ever have this issue before?