found two sets of letters/numbers on my converter. Hoping someon can decipher them for me

K1 C B42
&
K2 C 038

 

Don't know what trans the converter is for. but here's the info for a 700 r4

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.

Super Important
Be careful if you have to replace any of the converter bolts. Too long of a bolt will dimple the cover and cause the Lock Up clutch to tear up when it applies. You can also cause the same type of problem by hammering the OEM bolts in with an impact wrench.