Chevy rear end

Yes it will work as long as the gear ratio is in the 3’s (308,323,342,355,373 etc) and came out of a similar truck. You will need to set the gears up. Meaning it will need to be re-measured and shimmed.

The GT4 means 3.73

Rear End Ratio RPO Codes:
GQ1 — AXLE REAR, STD RATIO
GT4 — AXLE REAR, 3.73 RATIO
GT5 — AXLE REAR, 4.10 RATIO
GU4 — AXLE REAR, 3.08 RATIO
GU5 — AXLE REAR, 3.23 RATIO
GU6 — AXLE REAR, 3.42 RATIO
G80 — AXLE REAR, LIMITED SLIP (POSITRACTION)

HC4 — AXLE REAR, 4.56 RATIO