Powerglide Extreme Planetary Assembly Kit 1.58 Ratio

Name: Powerglide Extreme Planetary Assembly Kit 1.58 Ratio
Brand: SONNAX
SKU: 852-28158G-06
Price: 4100.34 USD
Availability: InStock

^$4,100³⁴

Ships on 09/10/2026

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Planetary Assemblies

Powerglide Extreme Planetary Assembly Kit

1.58 Ratio

24 Tooth Drum Flange

OE Shaft Length

1.58 Ratio with OE length shaft

Ratio: 1.58
Flange Tooth Count: 24
Gear Process Level: Extreme
Material: HY-Tuf Rolled Spline
Shaft Length Option: OE

Engine power and RPM continue to increase, creating the need for different transmission and axle ratios to get the car down the track as quickly as possible. The innovative Sonnax 1.58 ratio Extreme planetary assembly kit 28158G-06 is designed to fit into existing Powerglide cases, allowing racers to achieve the lowest numerical ratio available for the Powerglide without the hassle and expense of converting to a different transmission.

Extreme planetary assemblies from Sonnax include Advanced Process sun gears and pinions made to the same exacting standards used on Formula 1, Nascar and other high-end professional racing circuits. Advanced Process parts undergo an additional three-step process that allows for greater durability and higher levels of performance. These units are fully assembled and ready to install.

Cryogenic tempering to ultra-low temperatures (-350°F) for an even denser, more uniform gear with a tough and wear-resistant structure.
Shot peening for increased gear resistance to fatigue failure, cracking or galling.
Super-finish to reduce friction, vibration, noise and wear on the gear, potentially tripling the life of the part.

The 1.58 assembly's front and rear sun gears undergo an additional Dry Film Lubricant (DFL) treatment to reduce spalling and improve longevity. The carrier also includes high strength steel/bronze/PTFE-coated rear sun gear washer and pinion thrust washers.

High-strength HY-Tuf output shaft with "rolled splines" to prevent spline twist
Direct replacement, requires no special assembly or case modification
Sonnax Extreme 9310 Advanced Process gears
Bolt together carrier for ease of service
High capacity reverse clutch assembly included

Gear Sets

Sonnax planetary gears are a big step up from standard case-hardened and tempered gears. Each gear set includes a flanged sun gear and a ring gear. The flange is machined from a billet, not a stamped piece. It is broached and matched to the sun gear for a precise press fit that does not require welding.

Planetary Assemblies

Planetary assemblies come in various configurations for different build requirements. The output shaft is available in the OE-length or short length and has a drum flange tooth profile which is 12-tooth (OE) or 24-tooth (fits Sonnax's 10-clutch drum). Units are fully assembled with a rear sun gear bearing upgrade and OE or steel-backed, PTFE-coated thrust washers.

Part TypeAutomatic Transmission Planetary Gear

Product LineSonnax Powerglide Planetary Gear Sets & Assemblies

BrandSONNAX

Package Height9.6

Package Width9.7

Package Length20.7

Weight27.39 PG

Part CategoryReplacement Parts

Part FitmentSemi Universal

Vendor Part Number28158G-06

Package Qty1

Package TypeEA

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Some parts are not legal for use in California or other states with similar laws / regulations

Powerglide Extreme Planetary Assembly Kit 1.58 Ratio

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