On February 6, 2013, Allison Transmission Holdings, Inc. (the "Company") and Allison Transmission, Inc. ("ATI"), a wholly-owned subsidiary of the Company, entered into that certain Amendment No. 6 ("Amendment No. 6") to the Credit Agreement, dated as of August 7, 2007 (the "Credit Agreement") and that certain Amendment No. 7 ("Amendment No. 7") to the Credit Agreement.

Amendment No. 6 refinanced $793.0 million of term loan debt due August 7, 2017. The interest rate margin applicable to such refinanced loans is, at ATI's option, either (a) 3.00% above the London Interbank Offered Rate or (b) 2.00% above the greater of the prime lending rate provided by the British Banking Association or the federal funds effective rate published by the Federal Reserve Bank of New York.

Amendment No. 7 extended the maturity of $411.5 million of term loan debt from August 7, 2014 to August 7, 2017. The interest rate margin applicable to such extended loans is, at ATI's option, either (a) 3.00% above the London Interbank Offered Rate or (b) 2.00% above the greater of the prime lending rate provided by the British Banking Association or the federal funds effective rate published by the Federal Reserve Bank of New York.

This summary of Amendment No. 6 and Amendment No. 7 does not purport to be complete and is subject to, and qualified in its entirety by, the full text of Amendment No. 6 and Amendment No. 7, filed as Exhibits 10.1 and 10.2, respectively, to this Current Report on Form 8-K and incorporated herein by reference.

(d) Exhibits.

Exhibit
Number                                    Description

10.1         Amendment No. 6 to the Credit Agreement, dated as of February 6, 2013,
             among Allison Transmission Holdings, Inc., Allison Transmission, Inc.,
             as Borrower, the several banks and other financial institutions or
             entities from time to time parties thereto as Lenders, Citicorp North
             America, Inc., as Administrative Agent and the other agents and
             arrangers party thereto.

10.2         Amendment No. 7 to the Credit Agreement, dated as of February 6, 2013
             among Allison Transmission Holdings, Inc., Allison Transmission, Inc.,
             as Borrower, the several banks and other financial institutions or
             entities from time to time parties thereto as Lenders, Citicorp North
             America, Inc., as Administrative Agent and the other agents and
             arrangers party thereto.