I have a 2003 chevy s10 4.3L 4x4 ZR2..What size Brake line from front to rear? Also wondering fitting size used.

SOURCE: 2003 chevy tahoe front rear end fluid

i think what you are talking about is the front differential. you will wanna put gear oil in it. the correct weight would be found in your manual.

SOURCE: need Rear Brake Diagram for 1994 Chevy K2500 4x4

Here is the diagram,It is always a good idea to only disaasemble one side so you can use the other side as a reference,I also reccomend using a set od brake pliers,they will the disassembly and reassembly much easier.

SOURCE: 00 Chevy EHCU HELP

bleed each separately

SOURCE: 1997 chevy Blazer ZR2 4x4 not engaging

Fab only gave part of an answer. Check the vacuum lines on the driverside firewall. Also check your heater/AC unit make sure the air deflector will change from defrost to vent. If it stays on defrost no matter where you put the knob then you have a disconnected or leaking vacuum line to the dash. If that works and you don't see any open hoses then remove the battery and battery tray. You'll find the actuator there. Remove the vaccum line that goes to it, connect the battery or jumper cables so that you can start the engine. Put it in 4HI and feel for a vacuum at the line. If you do then put it on the actuator and see if it pulls on the cable. If there is no vacuum at that line then the switch at the transfer is bad and isn't sending vacuum to the actuator. If you do have vacuum and the cable didn't pull then change the actuator.

SOURCE: how to replace rear wheel bearing on 2003 chevy

its not hard but you do have to remove diff cover and then take out spider shaft to remove clips that hold axle. then remove bearing with slide hammer or puller. if bearings are bad so is the axle because its part of the bearing