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  • 77749HDB-PTP, 4L60E Reaction Sunshell, The Beast
  • 77749HDB-PTP, 4L60E Reaction Sunshell, The Beast, top view with the Patent Number and SAP's stamped number
  • 77749HDB-PTP, 4L60E Beast Sunshell with Patent Number
  • 77749HDB-PTP, 4L60E Beast Sunshell showing SAP's stamped number 42298B

The Beast Sun Gear Shell 700R4 4L60E Reverse Reaction

$68.75 $49.99
(You save $18.76)

Product Description

The Beast Sun Gear Shell for 4L60 4L60E 4L65E 700R4 GM Transmissions is a must have upgrade for your transmission rebuild, especially for heavy duty applications.  The factory part is known to wear after extended use, and causes the loss of reverse and makes shifting difficult.  The patented upgrade by ProSelect and Seal Aftermarket Products (SAP) increases the Sun Shell's durability and performance, which leads to a longer transmission life.

The OEM reverse reaction sun shell that came in your transmission is a common failure point.  This BEAST Sun Gear Shell has been redesigned to eliminate cracking and breaking with a reinforced neck collar spine made of heavier and thicker material to eliminate fatigue failure. Prevents loss of reverse, second and fourth gears. Rebuild with the Beast.

This is the Genuine Beast from ProSelect. Manufacturer suggests replacing the inner sun gear bushing when installing this shell. Washer installation is shown. The original metal washer or bearing between the front annulus gear and sun gear are not affected. "The Beast" replaces both washer and bearing style shells. The washer is NOT included in this listing. Contact us if you need one.

We recommend the Beast SunShell, aka Sun Gear Shell, if you're considering a rebuild for your GM 4L60E type transmission.  


Hummer (H2) (H2 SUT), 2004-2007, V8 6.0L 6SPD RWD 4X4

Hummer (H3) (H3T), 2006-2010, L5 3.7L V8 5.3L 4SPD RWD 4X4

Buick Rainer 2004-2007, L6 4.2L V8 5.3L 4SPD RWD AWD

Buick Roadmaster, Wagon1994-1996, V8 5.7L 4SPD RWD

Cadillac Escalade, ESV, EXT 1999-2007, V8 5.3L 5.7L 6.0L 4SPD RWD AWD

Cadillac Fleetwood, Brougham, Limo 1991-1996, V8 4.9L 5.7L 4SPD RWD

Chevrolet Astro Van, Safari 1995-2007, V6 4.3L 4SPD RWD 4X4

Chevrolet Avalanche, 2001-2009, V8 5.3L 4SPD RWD 4X4

Chevrolet Blazer, GMC Jimmy 1992-2007, L4 2.2L L6 4.2L V6 4.3L V8 5.3L 4SPD RWD 4X4

GMC Envoy, Chevrolet Trailblazer 1992-2009, L4 2.2L L6 4.2L V6 4.3L V8 5.3L 4SPD RWD 4X4

Chevrolet Camaro 1994-2002, V6 3.4L 3.8L V8 5.7L, 4 SPD RWD 4SPD RWD

Chevrolet Colorado, GMC Canyon 2004-2011, L4 2.8L L5 3.5L L4 2.9L L5 3.7L V8 5.3L 4SPD RWD 4X4

Chevrolet Corvette 1992-2005, V8 5.7L 6.0L 4SPD RWD

Chevrolet Express, GMC Savana 1500-2500 1996-2011, V6 4.3L V8 4.8L 5.3L 5.7L 4SPD RWD 4X4

Chevrolet Silverado, GMC Sierra 1500-3500 1995-2010, V6 4.2L V6 4.3L V8 4.8L 5.0L 5.3L V6 5.4L 5.7L 6.0L 4SPD RWD 4X4

Isuzu Hombre 1997-2000, L4 2.2L V6 4.3L 4SPD RWD 4X4

1280 2006, L4 2.8L 4SPD RWD 

1290 2007-2009, L4 2.9L 4SPD RWD

1350 2006, L5 3.5L 4SPD RWD 4X4

1370 2007-2009 L5 3.5L 4SPD RWD 4X4

Oldsmobile Bravada 1993-2004, L6 4.2L V6 4.3L 4SPD RWD 4X4

Pontiac GTO 2004-2007, V8 5.7L V8 6.0L, 4 SPD, RWD

SAAB 9-7, 9-7X 2005-2009, L6 4.2L V8 5.3L 4SPD RWD



Parts ship daily from our distribution center. Expedited shipping available.

Packaged for wholesale distribution.


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Send us a message to or call (877) 782-5582.

¿Preguntas en español? Escríbanos a con el año, la marca, y el modelo de su vehículo o llámanos a (877) 782-5582.

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Product Videos

77749HDB, The Beast Reaction SunShell for GM 700R4 4L60E Transmissions 02:40

The Beast Reaction Sunshell, product number 77749HDB-PTP, is a common fix for stripped splines in the GM 700R4 and 4L60E transmissions. This factory sunshells often give, which leads to a loss of reverse and won't shift. Review by Phoenix Transmission Parts and found on, 877-782-5582.

  • 77749HDB, The ...
    The Beast Reaction Sunshell, product number 77749HDB-PTP, is a...

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