GM 621 Reproduction Bellhousing

Quick Overview

Having a hard time locating a good Chevy 621 bellhousing that doesn't have stripped threads or cracks? Look no further because Silver Sport Transmissions produces its own version of the 621 bellhousing. This new bellhousing is cast from thick wall titanium aluminum alloy, CNC machined to provide precise location of mounting and dowel pin holes, and the center bore that locates the gearbox.

Availability: In stock

$249.95

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$249.95

OE Replacement

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  • OE Replacement
  • OE Replacement with Inspection Cover
  • LS Version

Having a hard time locating a good Chevy 621 bellhousing that doesn't have stripped threads or cracks? Look no further because Silver Sport Transmissions produces its own version of the 621 bellhousing. This new bellhousing is cast from thick wall titanium aluminum alloy, CNC machined to provide precise location of mounting and dowel pin holes, and the center bore that locates the gearbox. SST’s bellhousing can be used with all factory type clutch linkage parts while the design maintains its original style appearance. The bellhousing weighs 11.5 pounds, works with a factory style 168 tooth flywheel and the appropriate standard GM starter. It even includes a new inspection cover and hardware making it a seamless installation process. SST also produces a variation of this bellhousing which works specifically with the GM LS engine platform and a hydraulic clutch actuator.


Bellhousings come in 2 versions:



  • OE Replacement: $269.95

  • LS Version (no inspection cover, does not bolt to oil pan) $249.95

SST's New 621 Bellhousing Reproduction Part Features:



  • Strong thick wall titanium-aluminum alloy – 50% thicker than OE

  • Precision CNC machining including spot faced mounting holes, precision dowel pin holes and bores

  • Works with stock clutch linkage and hydraulic clutch actuator

  • Uses the 168-tooth flywheel and standard GM starter

  • Maintains Transmission Life - high accuracy (< 0.003 inch runout) maintains transmission life, shift quality, low noise

  • Brand New - all threads, bores, faces are in new condition and clean

  • Accurate Starter Location - precision CNC machining

  • Uses all factory linkage parts: clutch forks, z-bar, rubber dust boot, etc.

  • Includes Inspection Cover (except for LS) and Hardware

  • 11.5 lbs

  • Choose GM or GM LS engine platform 


Both bellhousing styles are compatible with the following transmissions:



  • Tremec TKO

  • Muncie 4 speed

  • Borg-Warner Super T10

  • Saginaw 3 and 4 speed

  • Any manual transmission sharing this same bolt pattern and input shaft length requiring a 4.685” register hole.

How to put a Classic Muncie Behind Your LS Swap - Hotrod Magazine, February 2014

Questions about the GM 621 Reproduction Bellhousing?
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