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Nitro Power Lock Posi, 3.73 & Down 55-64 GM 55P Pass
55-64 GM 55P Pass, Power Lock Posi, 3.73 & Down

Price: $647.90

Product Code: PLGM55P-3-17

Description Vehicle Applications Warranty Information

Nitro Power Lock Posi, 3.73 & Down
55-64 GM 55P Pass

1958-1964 Chevy Impala
1958-1964 Chevy Biscayne
1955-1964 Chevy Bel Air
1955-1961 Chevy Nomad
1956-1962 Chevy Corvette

Differential: 8.2" Drop-Out (1955-1964)
Gear Ratio: 3.90 & Down and Thick
Axle Splines: 17
Ring Gear Bolts: 10 (not included)
Manufacturer: Nitro Gear & Axle
Warranty: 1 Year

You'll want to check out this article on Expedition Portal about the benefits of installing a Nitro locker.

Tech Note:
Requires Positraction Additive which can be purchased separately.

Nitro gears are manufactured from 8620 steel gear forgings in the same manufacturing facilities as GM, Dodge, Ford & Toyota. They are precision machined using computer controlled processes, heat treated, CNC triple-lapped and Rockwell tested for hardness. These extra steps ensure excellent fitment, ideal contact pattern and smooth, quiet operation.

Nitro Gear and Axle Premium Differential Ring and Pinion Gears, Axles and parts
Differential parts you can depend on.

Ring & Pinion Install


This product can expose you to chemicals including toluene and benzene, which are known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to: www.P65Warnings.ca.gov

  • 1 Year Warranty*
  • Ultimate traction available from a limited slip differential.
  • V-Ramp cross shafts provide additional traction as throttle is applied.
  • Assembled in the USA using the highest quality CNC machined & heat treated components.

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