S10 Extreme has drive shaft vibration and shop

check "U" joints for wear or dry

(1st) Check the engine and gearbox mountings.

(2nd) Check the brake-disc's if it needs to be sceemed.

this could be multiple things, check to make sure your tires dont have a slipped belt, or are not bumpy. Also sometimes the front shaft for four wheel drive has a bad u joint, or bad cv shaft right or left.

That would be a u-joint that is worn out causing the vibration. Check for excessive play in your drive shafts,. The front drive shafts are common for bad u-joints.

Usually if there is a howl on acceleration from the rear it's the big pinion bearing,if the howl is on deceleration it's the small pinion bearing.(the pinion shaft with these bearing is the one in the diff that the driveshaft attaches to)

vibration at highway speeds is normally a tire balance issue. take it to a tire shop and have them inspect and balance the tires.

Replacing the boot is not even an option at this point. Get yourself a chiltons or haynes manual for instructions and I recommend replacing the entire axle (prices are very reasonable as rebuilt or from a scrapyard). I recommend buying the manual first and reading it over, then deciding if the job is too difficult and if you need to have it done at a shop. The manual will help you in many situations so buying one will save you $ in the long run, even if you have this job done elsewhere!!!

Front and rear impeller shafts?? Not sure if you mean drive shafts or not? The problem could be in your front drive axles/drive shaft. If you replaced them all that would be 4 total (very expensive). I would try another shop if that much was replaced and didn't solve the issue. When does the problem start in idle, driving on bumps, highway? Could be a motor problem too. Need more info.

IT IS PROBABLY U- JOINTS CHANGED MINE AND SOLVED PROBLEM FACTORY U JOINTS ARE NOT GREASABLE AND IF YOU DO A LOT OF HIGHWAY DRIVING ;WEAR OUT QUICKLY. GO TO NAPA AUTO PARTS AND REPLACE WITH GREASABLE ONES $15.00 EACH.

As for your shaking at highway speeds, providing your tires have been balanced properly, it's probably a u-joint. If you let off the gas when it's vibrating, and the vibration quits immediatly, it's a u-joint. If it doesn't, it's a tire or wheel.
The squeak is probably a shock, but that would be a guess.