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GM Torque converters
Sunday, August 19, 2018
   
  700R4 converter's come in both a 10'' and 12'' diameter. 10'' is found behind 4 cyl. and V6 while the 12'' is in everything else. There are 8 different 10'' converters and 7 different 12'' converters. The differences in both the 10'' & 12'' are converter stall speed and dampener spring rate. The 12'' comes in a 27 or 30 input spline and a 3 or 6 mounting pad design. GM uses a sticker code (decal) or a ink # stamped on the flywheel side of the converter to ID the different stall speeds and spring rates.

Also
700R4's used behind 6.2L Diesel engines MUST use a converter with a poppet release valve. The poppet valve releases the Lock Up clutch on deceleration (coast) to prevent a chugging feeling. Never install a poppet valve converter behind a gas motor or you'll have a neutral on 3-4 upshift, 3-4 shuttle or in and out of Lock Up.

12'' Converter
Type 1
I.D. Code - G / 6.2L Diesel
Stall Speed - 1425 RPM
Mounting type - 6 pads
Description - 12'' diameter, 27 splines, 1.703'' pilot with converter clutch.

Type 2
I.D. Code - B / All 5.7L HO Engines
Stall Speed - 2025 RPM
Mounting type - 3 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch.

Type 3
I.D. Code - E / 4.3L & 5.0L V8
Stall Speed - 1639 RPM
Mounting type - 3 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch.

Type 4
I.D. Code - F / 5.0L
Stall Speed - 1568 RPM
Mounting type - 3 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch.

Type 5
I.D. Code - G / 5.0L & 5.7L
Stall Speed - 1428 RPM
Mounting type - 3 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch.

Type 6
I.D. Code - K
Stall Speed - 1211 RPM
Mounting type - 3 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch.

Type 7
I.D. Code - G
Stall Speed - 1428 RPM
Mounting type - 6 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch.

10'' Converter
Type 1
I.D. Code - HA1
Stall Speed - 2795 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

Type 2
I.D. Code - HB1
Stall Speed - 2560 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

Type 3
I.D. Code - HD2
Stall Speed - 2095 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

Type 4
I.D. Code - HE9D
Stall Speed - 1865 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

Type 5
I.D. Code - HJ2, KIJAD
Stall Speed - 2060 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

Type 6
I.D. Code - HK1
Stall Speed - 2760 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

Type 7
I.D. Code - HY9D
Stall Speed - 1420 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

Type 8
I.D. Code - HZ2, HZAD
Stall Speed - 2375 RPM
Mounting type - 3 square pads
Description - 10'' diameter with 1.748'' pilot with converter clutch.

   
 

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