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
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New Parts

Reinforced Input Housing Kit with Heavy Duty Input Shaft Reinforced Input Housing Kit with Heavy Duty Input Shaft
77733-15K
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Sonnax reinforced OE input housing and heavy-duty input shaft kit 77733-15K is a great upgrade for 4L60-E, 4L65-E and 4L70-E high performance and heavy-duty applications. Shaft is made of specia...

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Reinforced Input Housing Kit with Heavy Duty Input Shaft Reinforced Input Housing Kit with Heavy Duty Input Shaft
77733-14K
HP Icon

Sonnax reinforced OE input housing and heavy-duty input shaft kit 77733-14K is a great upgrade for GM 4L60-E, 4L65-E high performance and heavy-duty applications. The shaft is made of specially ...

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Reinforced Input Housing Kit with Heavy Duty Input Shaft Reinforced Input Housing Kit with Heavy Duty Input Shaft
77733-13K
HP Icon

Sonnax reinforced OE input housing and heavy duty input shaft kit 77733-13K is a great upgrade for GM 4L60, 4L60-E high performance and heavy-duty applications. The shaft is made of specially he...

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Servo Piston Seal Servo Piston Seal
18608T
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Sonnax PTFE servo piston seal fits OE and aftermarket GM Powerglide servos.

  • Material: PTFE
 
Heavy Duty Output Shaft Heavy Duty Output Shaft
74678L-HD
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Output shaft failure is common as power levels are increased in GM 4L60-E, 4L65-E and 4L70-E units. Sonnax heavy duty output shaft 74678L-HD for high-horsepower street or strip 2WD and Corvette ...

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Heavy Duty Output Shaft Heavy Duty Output Shaft
74678S-HD
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Output shaft failure is common as power levels are increased in GM 4L60-E, 4L65-E and 4L70-E units. Sonnax heavy duty output shaft 74678S-HD for high-horsepower street or strip 4WD/AWD applicati...

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Input Drum Reinforcement Kit Input Drum Reinforcement Kit
77733-51K
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The GM 4L60, 4L60-E, 4L65-E and 4L70-E input drum assembly is known to crack where the input shaft is pressed into it (where the overrun piston rides). Sonnax offers a hardened steel sleeve that...

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Clutch Plate Clutch Plate
CH-CP-5
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Sonnax clutch plate CH-CP-5 has two solid, one-piece, HTE friction rings bonded to an internally splined plate. It replaces the clutch plate in Sonnax multi-plate converter clutch kits Read More

  • Outer Dia.: 11.630"
  • Inner Dia.: 9.470"
  • Thickness: 0.181"
  • Material: HTE
 
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