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04-05-2025, 09:25 AM
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#1 |
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Registered User
Join Date: Sep 2019
Location: Dade City
Posts: 107
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72 Chevy K20 SM 465 throwout bearing
Do I need a long or short throwout bearing? Researched but seem to get conflicting info. I have compared the diaphragm pressure plate to the HD 3 finger which I'm using. The 3 finger plate is definitely taller than the daiphragm plate. I figure i need the short throwout bearing because of the heavy duty clutch being taller. All replies appreciated.
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04-05-2025, 09:47 AM
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#2 |
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All stock and staying that way
  
Join Date: Jul 2003
Location: Elkland, PA
Posts: 2,501
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Re: 72 Chevy K20 SM 465 throwout bearing
Assuming you have the 350 engine.
Per the GM parts manual:
__________________
1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels Last edited by 1970cstblazer; 04-05-2025 at 09:53 AM. |
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04-05-2025, 09:53 AM
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#3 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 2,501
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Re: 72 Chevy K20 SM 465 throwout bearing
Marked "CT24E" per the book:
  Other part numbers include 900018, 907403 907826
__________________
1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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04-05-2025, 11:34 AM
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#4 |
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Registered User
Join Date: Sep 2019
Location: Dade City
Posts: 107
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Re: 72 Chevy K20 SM 465 throwout bearing
Well, I'm using the Borg and Beck 3 finger clutch, no diaphragm. problem solved. Found a post on Chevy Talk that says use long one for flat diaphragm and short one for raised finger diaphragm and 3 finger clutch.
Last edited by prateroad; 04-05-2025 at 01:00 PM. |
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04-05-2025, 01:37 PM
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#5 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 2,501
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Re: 72 Chevy K20 SM 465 throwout bearing
The three finger was used originally. The diaphragm pressure plate clutches were common beginning in the late '70's.
According to the parts books, T.O. bearing 908244 was used up to at least 1984 even on the newer style pressure plate.
__________________
1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels Last edited by 1970cstblazer; 04-05-2025 at 01:48 PM. |
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04-05-2025, 07:36 PM
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#6 |
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Registered User
Join Date: Apr 2014
Location: California
Posts: 1,126
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Re: 72 Chevy K20 SM 465 throwout bearing
Can you guys tell me the throwout bearing for a '72 C30 with a 402?
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04-06-2025, 07:33 AM
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#7 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 2,501
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Re: 72 Chevy K20 SM 465 throwout bearing
The page with that info for 1971-72 "400" is missing, but for 1969-70 396, they list the 908244 T.O bearing.
__________________
1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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04-07-2025, 10:32 PM
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#8 | |
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Registered User
Join Date: Apr 2014
Location: California
Posts: 1,126
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Re: 72 Chevy K20 SM 465 throwout bearing
Quote:
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