It's probably going to be best if a member that is more familiar with the 2002 Z-71 4WD trucks, comes and speaks to any possible special shocks that may or may not be possible on your truck. (See post above this one.)
There is no "ratio" for the cv-axles.
The cv-axles simply provide a straight connection between the front differential and both front wheels.
The ratio of the gearing in the front and rear differentials is, however important, but generally only when the truck has it's 4WD system engaged.
For normal driving, especially on dry pavement, you should be driving only in 2WD mode.
Even a fully functional 4WD truck, when driving with the 4WD system engaged, will drive very badly if all of the wheels can not slip independently of each other on a hard, dry surface.
When the 4WD system is engaged, the front wheels are locked in sync and since one side can not spin faster or slower than the other side, the truck's tires will scrub and skip across the dry pavement, especially while turning, either forwards or backwards.
Normally, in 2WD mode, both front tires move independently of each other and one wheel is allowed to move faster than the other when driving around corners.
If, for some reason, the gear ratio in the front and rear differentials are not identical, when the 4WD system is engaged, with the front and rear differentials locked in, the front and rear tires can not turn at the same rate and bad things can happen.
Those ratios could be different for several reasons.
One might be one of the differentials may have failed at some point and a previous owner may have swapped in a used front or rear differential as a repair, not knowing or caring to keep the same gear ratio with the other end of the truck.
Sometimes, an owner might lift their truck and put much larger than stock wheels and tires on the vehicle.
Doing that can sometimes cause the performance and fuel mileage to suffer greatly and one fix is to change out the differential gearing to something more suitable.
Normally, if this is done, both the front and rear would be changed at the same time to match the new gear ratio.
If someone only changed the rear gear ratio and opted to skip the front differential, then anytime the 4WD system is engaged, bad things will happen.
I wonder if the first thing you need to verify is if whether or not you are attempting to drive around with the 4WD system engaged.
You should only drive in 4WD when driving on loose surfaces like snow/ice and loose dirt.
Use 2WD at all other times.
I would suggest not using the Auto 4WD either, just 2WD.
Using the Auto 4WD setting, the 4WD system will engage and lock and release the four wheels as the system deems necessary.
You can expect worse possible fuel mileage using Auto 4WD since a portion of the 4WD is always engaged.
Once again, it is generally best to use 2WD unless there is an actual need to use 4WD.
It could also be possible that your 4WD system is not disengaging when it is supposed to be.
If you can get the truck up on a lift with all four tires hanging free, with the engine off and the transmission in neutral, walk to each wheel and turn by hand.
In 2WD mode, turning either front tire should not cause any other tire to rotate.
Turning one of the rear tires should only cause the opposite rear tire to turn in the opposite direction and the front tires should not move.
While in 4WD mode, turning any one wheel should cause the other three to rotate.
As I go back and read your posts, I don't understand why the mechanic installed a cv-axle in the first place.
Was he just installing a cv-axle because there was not one already installed?
Maybe a previous owner removed the driver's side cv-axle because there was a problem with the 4WD system not disengaging as it should and they were seeing the issues you are now seeing when the cv-axles are both installed.