March 28, 2011

VIA EDGAR AND FACSIMILE

United States Securities and Exchange Commission

Division of Corporation Finance

Mail Stop 4631

100 F Street, N.E.

Washington, D.C. 20549

Attention:  John Hartz

Re:           Form 10-K for the Fiscal Year ended November 30, 2010

Schedule 14A filed on February 17, 2011

File No. 1-1520

Ladies and Gentlemen:

We are in receipt of your letter dated March 16, 2011 (the “Comment Letter”) including comments of the staff of the Securities and Exchange Commission relating to the above-referenced matters filed by GenCorp Inc. (the “Company”).   The Company is actively engaged in preparing a response. However, due to scheduling constraints of certain key employees and the Company’s upcoming Annual Meeting of Shareholders, the Company is not able to respond within the requested ten (10) business day deadline included in the Comment Letter.  Therefore, in accordance with our outside counsel’s discussion with Jessica Kane this morning, the Company requests an extension to respond to the Comment Letter on or before April 13, 2011.

If you have any questions or require any information pending our response to the Comment Letter, please feel free to contact our outside counsel, Jeffrey Spindler, at (212) 451-2307 or Elizabeth Gonzalez at (212) 451-2206.

Sincerely,

/s/ Kathleen E. Redd

Kathleen E. Redd

Vice President, Chief Financial Officer and Secretary