No one knows transmissions & torque converters like

Sonnax

No one knows transmissions & torque converters like 2008-sonnax-logo-white

High Performance Gearhead
Short Shaft 1.58 Ratio

1.58 Ratio Powerglide® Planetaries

Achieve the lowest numerical ratio available for Powerglide® while eliminating the hassle and expense of converting to a different transmission.

Choose from three 1.58 ratio, 24-tooth drum flange assemblies:

Watch the 1.58’s world-record breaking runs on YouTubeYoutube Logo
Shane Fisher's World Record Run

Heavy Duty & High Performance Upgrades

Sonnax high performance transmission products meet the toughest challenges faced by hard-working, daily-use transmissions as well as racing units going all-out on the street or track. Products range from innovative upgrades designed to fix everyday problems rebuilders see in their shops to an extensive line of Powerglide® components. We also offer specialty parts for high performance torque converters.

New & Improved Powerglide® 10-Clutch Drum Kits

Sonnax invented the original, high-capacity Powerglide® 10-clutch drum more than a decade ago, and the proven dependability of this patented drum makes it a popular choice among racing enthusiasts.

Sonnax now offers an expanded selection of new and improved 10-clutch drums for the very best in value and performance. The most significant improvement to these parts is an additional .060" in piston travel for greater clutch clearance, which also eliminates the possibility of the piston seal coming out of the bore.

New kits provide more build combinations, making it easier than ever to tune clutch capacity for maximum durability on the track.

Cutaway_clutch_drum
28756-15k

10-Clutch Drum, Hub & Piston Kit

28756-15K
28756-16k

10-Clutch Drum, Hub & Piston Kit with Bearing

28756-16K
28756-01k

10-Clutch Drum Kit

28756-01K
Old Part No. 28755-01K
28756-08k

10-Clutch Drum Kit with Bearing

28756-08K
Old Part No. 28755-08K
28756-01

10-Clutch Drum

28756-01
Old Part No. 28755-01
28756-08

10-Clutch Drum with Bearing

28756-08
Old Part No. 28755-08
28765-05

10-Clutch Piston

28765-05
Old Part No. 28765-04
New-part-logo

New Parts

Powerglide® 1.80 Ratio Contender Gear Set Powerglide® 1.80 Ratio Contender Gear Set
180S-1K
HP Icon

Sonnax offers complete Powerglide planetary assemblies in a variety of ratios and configurations to ensure you get the performance you want without overpaying or sacrificing quality.

The ...

Read More

  • Ratio: 1.80
  • Gear Process Level: Contender
  • Flange Tooth Count: 12
 
Powerglide® 1.80 Contender Planetary Carrier Assembly & Output Shaft Powerglide® 1.80 Contender Planetary Carrier Assembly & Output Shaft
28180F-01
HP Icon

Sonnax offers complete Powerglide planetary assemblies in a variety of ratios and configurations to ensure you get the performance you want without overpaying or sacrificing quality.

The ...

Read More

  • Ratio: 1.80
  • Shaft Length: OE
  • Gear Process Level: Contender
  • Material: 4340 Cut Spline Shaft
  • Flange Tooth Count: 12
 
Powerglide® 1.80 Contender Planetary Carrier Assembly & Output Shaft Powerglide® 1.80 Contender Planetary Carrier Assembly & Output Shaft
28180F-01S
HP Icon

Sonnax offers complete Powerglide planetary assemblies in a variety of ratios and configurations to ensure you get the performance you want without overpaying or sacrificing quality.

The ...

Read More

  • Ratio: 1.80
  • Shaft Length: Short
  • Gear Process Level: Contender
  • Flange Tooth Count: 12
  • Material: HY-Tuf Cut Spline Shaft
 
Inner Stator Race Inner Stator Race
GM-HR-18
HP Icon

Sonnax special high performance inner stator race GM-HR-18 can be used to convert GM 245mm LU (3T40, 3L30, 200C, 4T60-E, 4L60 & E: S-10 only) applications to a 36-tooth internal spline for G...

Read More

  • Length: 1.180"
  • Outer Dia.: 2.156"
  • Material: Hardened steel
  • Internal Spline Teeth: 36
 
Replacement Apply Plate Replacement Apply Plate
28131-2AP
HP Icon

Replacement apply plate 28131-2AP is a service part for the increased active radius reverse clutch kit used in Sonnax Powerglide 1.58 ratio planetary assembly kits.

 
Replacement Pressure Plate Replacement Pressure Plate
28131-1PP
HP Icon

Replacement pressure plate 28131-1PP is a service part for the increased active radius reverse clutch kit used in Sonnax Powerglide 1.58 ratio planetary assembly kits.

  • Inner Dia.: 6.120"
 
Replacement Friction Kit Replacement Friction Kit
28131-FRK
HP Icon

Replacement friction kit 28131-FRK is a service kit with seven friction plates for the increased active radius reverse clutch kit used in Sonnax Powerglide 1.58 ratio planetary assembly kits.

 
Replacement Steel Kit Replacement Steel Kit
28131-STK
HP Icon

Replacement steel kit 28131-STK is a service kit with eight plates for the increased active radius reverse clutch kit used in Sonnax Powerglide 1.58 ratio planetary assembly kits.

 
View more new High Performance parts View all High Performance parts