Yes, and I lowered it to 2.1 and have no issues since. My cv blew out the middle at 2.8, cv didn't pop off but was actually torn.
I don't know if there are custom axles that come with lifts. The axles are relatively cheap less then 100 bucks and that includes both cv's I believe. At 2.8 it is near the level where you can't use stock axles. However, many guys run at 2.8 and have no issues, it is still near the upper limit of what is going to be possible. My tire guy said it was a risk, and the cv broke sure enough, and he still paid for it, good guy.
this is old but some stuff relevant.
from link, but read the entire link.
We'll start with the front suspension. The two ways of adding lift to a Ram is either coil springs or spacers. Rather than debate the logic of one over the other, I'll focus on what happens when you use either.
As a rule of thumb, for every 2 inches you add in lift to your Ram you will move the front axle back about 3/4 of an inch and uncenter under the frame about the same amount. So a 3 inch spacer/spring would move the axle about an inch. A 5 inch (another common size) spring would move your axle back and over about 2 inches, etc. Obviously this causes caster and dog legging issues along with severe triangulation of the factory track bar, control arms and ball joints. It degrades the ride because the of the control arm angles, and places unrealistic loads on shocks, ball joints and the afore mentioned track bar. The front sway bars ability to control body roll is also compromised to the angle of the links which causes them to deflect under load rather than load the bar and vehicle, destroying handling. I'm going to explain in a moment why a properly lifted vehicle retains this piece.
