Powerglide

1.80 Ratio Contender Planetary Assembly Kit
Part No. 28180F-01

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Sonnax offers complete GM Powerglide planetary assemblies in a variety of gear set options and configurations to ensure you get the performance you want without overpaying or sacrificing quality. Each comes fully assembled and ready to install.

Track-proven to 1,500 horsepower, Sonnax Contender planetaries are an affordable choice for high-quality builds on a budget. 1.80 Ratio Contender planetary assembly kit 28180F-01 features premium-processed sun and pinion gears that are a big step up from standard case-hardened and tempered varieties. High-quality materials combined with a special heat-treating process results in incredibly tough, wear-resistant gears.

  • High-quality sun and pinion gears deliver enhanced durability
  • High-strength output shaft resists twisting and breakage
  • Bolt-together carrier for ease of service

See chart and specs below to determine if this planetary assembly suits your application, or dial in options here to choose your build.

Contender

Track-Proven to 1,500 HP

Premium

Track-Proven to 2,000 HP

Extreme

Track-Proven to 3,000 HP

Sonnax Warranty 1 Year (Gears Only) 2 Years (Gears Only) 2 Years (Gears & Shaft)
Gear Material 9310 Suns
8620 Pinions
9310 Suns
9310 Pinions
9310 Suns
9310 Pinions
Gear Process Premium Premium Advanced (Learn More)
Shaft Material Long Shaft = 4340
Short Shaft = HY-Tuf
Long Shaft = 4340
Short Shaft = HY-Tuf
300M
Shaft Splines Cut Spline Cut Spline Rolled Spline
Thrust Washers OE Steel-Backed PTFE Steel-Backed PTFE
Ring Gear Standard Standard Maximum Duty

Applies to planetary assembly kits only

  • Carrier Assembly & Output Shaft OE Length, 4340 Shaft
  • Front Sun Gear & Drum Flange 12-Tooth
  • Ring Gear
  • Gear Process Level: Contender
  • Shaft Length Option: OE
  • Shaft Material: 4340
  • Ratio: 1.80
  • Flange Tooth Count: 12
  • Powerglide 1.80 Ratio Contender Planetary Assembly Kit 28180F-01

I run a Sonnax 1.80 straight cut gear set and have had no problems or issues, plan on purchasing another real soon for another car we are putting together. Thanks Sonnax for the reliability and durability in your product.

R. Merrill
Affordable Transmission
Brooklyn Park, MN