How do you remove and replace front wheel bearings on a 1996 Chevy Blazer 4x4?
you cannot replace the wheel bearings by themselves in a 4x4. they designed the hubs to have wheel bearings inside them. you must replace the whole hub assembly to get new wheel bearings. should run from 50-100 dollars a piece from a parts store, and about twice that at a dealer.
You need a 36mm socket and a breaker bar . Take the spline nut off the end of the cv shaft. I suggest doing this with the wheel still on the ground. Then jack the truck up. Remove the caliper and rotor, take out the three bolts holding in the hub. Be careful around the abs sensor. They are expensive. Installation is the reverse of removal. Torqe the spline nut to approx 180 ft.lbs.
in replacing the front bearings you need to replace the entire hub assembly. approx $300 remove the brake calaiper and mount, and the rotor. Remove the star screws holing the hub in place and remove the hub. *the hub may need to be persuaded with a hammer* Mine certainly did. be careful not to damage the 4x4 actuator wire. Replace the new hub over the groved axle and put everything back together. good luck
If you are talking about the crankshaft rod bearings, you can just remove the oil pan, and replace each crank bearing one at a time without actually removing the pistons. But to replace the piston pin rod bearings the pistons will have to be removed. IMO, if any of these bearings are worn bad enough to need replacing, then the engine needs a complete overhaul.