I have a 90 lumina, needs both hubs replaced. So I got the axle nut off, everything done, but as i go to put the CV nut back on, it is very tight. I only got half a turn by hand, and it is extremly hard now. Am I cross threading it or is it just damn tight? The bolt says Im not threading it by looking at the threads after a turn or so

If I remember right, there has to be some sort of a retainer on all axle nuts. Wheather its staked, a castle nut with a cotter pin, or interference threads. I think your nut does in fact have interference threads therefore its probably good its going on with some effort. How exactly did you get it off? Impact wrench? I know the torque on mostly all axle nuts is between 175 and 200 foot pounds. But i may be wrong, wait for maybe jeffco, max, or rich to come along and share there opinions before anything is done.

A/m bearings come with the nut torque in the instructions and the nut is the pinched type lock nut, look at it and you can see that it is not round.

A/m bearings come with the nut torque in the instructions and the nut is the pinched type lock nut, look at it and you can see that it is not round. So should it be tighter than $#!^ to get on? I may just be Im a scrawny 15 year old (which I am) but I dont feel like purchasing a new axle when I strip it, yet it says no to use an impact to get it off. I just used a breaker bar and a 4 ft pipe to get it off, going on again though.....

The axle is hardened steel, I thing before you mess up those threads you will mess up the axle nut threads. Just line it up, and turn it backwards a couple turns to try to line it up, and turn it on as far as you can by hand. Then get out your half inch drive ratchet and put it on. The end of the axle shaft is probably all rusty, so it has to get past the rust. Once past it will go on with a little less effort.

THere should be some resistance, but not where it's actually extremely difficult to turn. It sounds like you cross-threaded it, and it should be very apparent if you take the nut back off.