GM

Powerglide, TH350, TH400 (258mm) Performance Torque Converter

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Zip Kits

258mm Performance Converter Kit GM-RK-308

Includes Impeller Hub, 30-Tooth Turbine Hub, Thrust Washer, Bushing, Front Cover & Bushing; Pilot kit NOT INCLUDED

  • Unit Size: 258mm
  • Core: GM 258mm
  • Dampered: No
  • Lockup: No
  • Transmission Unit: TH350, TH400, Powerglide
  • Turbine Hub Input Spline Count: 30
Zip Kits

258mm Performance Converter Kit GM-RK-358

Powerglide transmissions must be upgraded with the 35-spline Sonnax big input shaft kit 353532-01K; Includes Impeller Hub, 35-Tooth Turbine Hub, Thrust Washer, Bushing, Front Cover & Bushing; Pilot kit NOT INCLUDED

  • Unit Size: 258mm
  • Core: GM 258mm
  • Dampered: No
  • Lockup: No
  • Transmission Unit: TH400, Powerglide
  • Turbine Hub Input Spline Count: 35
1
Zip Kits

Hub Cover MI-HC-Y

  • Material: Plastic
  • Color: Yellow
  • For Hub Dia.: 1-7/8"
2
3

Impeller (GM 258mm)

4

Snap Ring

5
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Thrust Bearing GM-N-26

  • Bearing Style: Enclosed
  • Material: Hardened Steel
  • Inner Dia.: 2.517"
  • Thickness: 0.239"
  • Outer Dia.: 3.577"
6
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Shim GM-WS-54

  • Material: Steel
  • Inner Dia.: 2.516"
  • Outer Dia.: 3.188"
  • Thickness: 0.030"
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Shim GM-WS-53

  • Material: Steel
  • Inner Dia.: 2.516"
  • Outer Dia.: 3.188"
  • Thickness: 0.020"
7
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Stator Cap GM-WS-47

  • Core: 258mm & 265mm
  • Material: Steel
  • Functional Thickness: 0.110"
  • Outer Dia.: 3.957"
  • Total Thickness: 0.410"
  • Pilot Dia.: 2.508"
  • Inner Dia.: 2.000"
8
Zip Kits

Clutch Eliminator GM-R-8

Not for street use.

  • Length: 1.010"
  • Outer Dia.: 3.250"
  • Internal Spline Tooth Count: 27
Zip Kits

Mechanical Diode® GM-MD-9-3

Use of this mechanical diode requires a 3.25" bore stator like the Opel or Sonnax GM-ST-082 or GM-ST-086.

  • Material: Steel
  • Internal Spline Tooth Count: 27
  • Design Strut Count: 9
  • Engagement Strut Count: 3
Zip Kits

Mechanical Diode® GM-MD-10S

Use of this mechanical diode requires a 3.25" bore stator like the Opel or Sonnax GM-ST-082 or GM-ST-086.

  • Material: Steel
  • Internal Spline Tooth Count: 27
  • Design Strut Count: 10
  • Engagement Strut Count: 2
Zip Kits

Mechanical Diode® GM-MD-3

Use of this mechanical diode requires a 3.25" bore stator like the Opel or Sonnax GM-ST-082 or GM-ST-086.

  • Material: Steel
  • Internal Spline Tooth Count: 27
  • Design Strut Count: 5
  • Engagement Strut Count: 1
9
Zip Kits

Stator Adapter GM-HR-50

Adapts the 3.25” OD clutch eliminator & mechanical diodes to the larger GM 258mm & 265mm stator bore.

  • Core: 258mm & 265mm
  • Material: Chromoly
  • Outer Dia.: 3.957"
  • Functional Thickness: 0.865"
  • Pilot Dia.: 2.508"
  • Inner Dia.: 3.254"
10
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Stator Kit GM-ST-8-1835

Stator employs 18 flat blades at a 35° angle.

11

Turbine

12
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Turbine Hub GM-HTCM-358

Included in GM-RK-358.

  • Material: Chromoly
  • Core: GM 258mm
  • Internal Spline Tooth Count: 35
  • Total Thickness: 1.530"
  • Flange Outer Dia.: 4.130"
  • Functional Thickness: 0.560"
  • Pilot Dia.: 1.745"
Zip Kits

Turbine Hub GM-HTCM-308

Included in GM-RK-308.

  • Material: Chromoly
  • Core: GM 258mm
  • Internal Spline Tooth Count: 30
  • Flange Outer Dia.: 4.130"
  • Total Thickness: 1.530"
  • Functional Thickness: 0.560"
  • Pilot Dia.: 1.745"
13
Zip Kits

Thrust Bearing JA-N-13

Included in GM-RK-308 & GM-RK-358.

  • Bearing Style: Enclosed
  • Material: Hardened Steel
  • Inner Dia.: 2.213"
  • Thickness: 0.236"
  • Outer Dia.: 3.228"
14
Zip Kits

Shim GM-WS-63

  • Material: Steel
  • Inner Dia.: 2.216"
  • Outer Dia.: 2.969"
  • Thickness: 0.031"
Zip Kits

Shim GM-WS-62

  • Material: Steel
  • Inner Dia.: 2.216"
  • Outer Dia.: 2.969"
  • Thickness: 0.020"
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Shim GM-WS-61

  • Material: Steel
  • Inner Dia.: 2.216"
  • Outer Dia.: 2.969"
  • Thickness: 0.010"
15

Bushing (Installed in GM-RK-308 & GM-RK-358 covers.)

16

Front Cover (Included in GM-RK-308 & GM-RK-358; Core Size: 258mm; 6 Pad, 7/16 bolt threads, all on a 10.75” bolt circle; Bushing installed.)

17
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Pilot GM-PI-0K

Use with no motorplate.

  • Pilot Type: Weld-in
  • Outer Dia.: 1.703"
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Pilot Kit GM-PI-250K

Use with 1/4" motorplate.

  • Outer Dia.: 1.703"
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Pilot Kit GM-PI-500K

Use with 1/2" motorplate.

  • Outer Dia.: 1.703"
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Pilot Kit GM-PI-125K

Use with 1/8" motorplate.

  • Material: Steel
  • Outer Dia.: 1.703"
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Washer GM-WS-375

Replacement washer for GM-PI-375K.

  • Material: Steel
  • Thickness: 0.375"
  • Inner Dia.: 0.443"
  • Outer Dia.: 1.000"
Zip Kits

Washer GM-WS-250

Replacement washer for GM-PI-250K.

  • Material: Steel
  • Thickness: 0.250"
  • Inner Dia.: 0.443"
  • Outer Dia.: 1.000"
Zip Kits

Washer GM-WS-125

Replacement washer for GM-PI-125K.

  • Material: Steel
  • Thickness: 0.125"
  • Inner Dia.: 0.443"
  • Outer Dia.: 1.000"
Zip Kits

Washer GM-WS-500

Replacement washer for GM-PI-500K.