There are four ways to find a ratio.
1 A dealer can normally tell from the vin number.
2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement
info.
3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.
4 You can divide the number of teeth on the ring gear and divide by number of teeth on the pinion.
No it does not SORRY
3.73
the fuel pump is in the gas tank
1 8 4 3 6 5 7 2 starting with driver side closest to the front as 1
The egr valve is on the top of the engine in the front it is plugged into your wiring harness and has two bolts holding it on, it is shaped like a cylinder and is next to the water jacket on the engine.
My 93gmc z71 was 13/8 sae
3.8
yes it will fit they are an exacty exchange anything from the new body style 1988 to 1998
no
The Detrioit Locker was common on Z-71 4x4 though i cannot say it is on every Z-71.
Replace them.
You can go to some off the auto parts stores such as Autozone and they can pull codes and tell you what the problem could be.