If you wish to lock the D-35 safely you will need chromo shafts, I recommend Superior shafts, very good CS and quality products. Many times you can find a kit, Shafts and a locker one price here is a good example, Superior Axle Super 35 Kit with Detriot Locker
However, keep in mind that does not remove the C clips only stronger shafts and a locker, if the shaft did let go it can walk itself out of the tube and you could possibly lose a tire. If you wanted further security, you can upgrade even further with shafts a locker and the C clips removal product that Superior also offers.
To lock the front an Aussie, or a lock rite, drop in locker is affordable for the weekend wheeler. Keep in mind though if your in the snow belt at all, a front auto locker like the ones I mentioned are not recommended. Many individuals who live in areas like this use selectable lockers, arb, ox, eaton. Also with a front locker avoid getting on the throttle and turning the wheel, u joints tend to go boo when you turn the wheel and more force in directed to them, chromo shafts and full circle clip u joints help with this. Good luck.