Mar 042012
 

our trucks rear end went out, it was a GT4,373 NO possi, the one we bought from a dismantler does have possi. Will it still work in our truck?

  One Response to “Chevy rear end”

  1. 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

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