so I have a 68 gmc suburban with a bad np203 and a dana 44 closed knuckle and gm 12 bolt rear with drum breaks in front and rear. I want to change my front to a closed knuckle 44 with disk brakes and the rear will need to be changed to because the case is cracked and I want disk brakes in the rear as well. I have a 327 with 350 turbo. So my question is can I just get a 75 suburban 4x4 and take the np205 and matching front and rear dana's and bolt them up with out have to change spline count. I belive my 68 was 27 spline and the 75 I think 30 but could be wrong.