Problem with axles fitting in cone suregrip.

Common problem. Sounds like the side gear splines in the sure grip aren't aligned properly. There's 2 ways of getting it aligned.

1. take the sure grip back out and loosen the bolts holding it together then slide in a set of axles aligning the splines and tighten the bolts back up. Note they are left hand threads

2. using a long pry bar wedged between the wheels studs (screw as many nuts as you can get on the studs to protect the threads) turn it slowly while pushing in on the axle. Most of the time it doesn't have to turn much then you can tap it in with a small dead blow hammer. It'd help if you can use a real strong flashlight to look down the axle tube and see which way the spline is off so you know which way to turn the axles the least amount.