Exhibit 99

Joint Filer Information

Date of Event
Requiring Statement:	May 2, 2012
Issuer Name and Ticker
or Trading Symbol:	Allison Transmission Holdings, Inc. [ALSN]
Designated Filer:	Carlyle Group Management L.L.C.
Other Joint Filers:	The Carlyle Group, L.P.
	Carlyle Holdings I GP Inc.
	Carlyle Holdings I GP Sub L.L.C.
	Carlyle Holdings I L.P.
	TC Group Sub L.P.
Addresses:	The address of each of the reporting persons is c/o The Carlyle Group, 1001 Pennsylvania Ave., N.W., Suite 220 South, Washington, DC 20004-2505.

Signatures:

Dated: May 8, 2012

CARLYLE GROUP MANAGEMENT L.L.C.
By:	/s/ R. Rainey Hoffman, attorney-in-fact
	Name:	Daniel D'Aniello
	Title:	Chairman
THE CARLYLE GROUP L.P. By: Carlyle Group Management L.L.C., its general partner
By:	/s/ R. Rainey Hoffman, attorney-in-fact
	Name:	Daniel D'Aniello
	Title:	Chairman
CARLYLE HOLDINGS I GP INC.
By:	/s/ R. Rainey Hoffman, attorney-in-fact
	Name:	Daniel D'Aniello
	Title:	Chairman
CARLYLE HOLDINGS I GP SUB L.L.C. By: Carlyle Holdings I GP Inc., its managing member
By:	/s/ R. Rainey Hoffman, attorney-in-fact
	Name:	Daniel D'Aniello
	Title:	Chairman

CARLYLE HOLDINGS I L.P. By: Carlyle Holdings I GP Sub L.L.C., its general partner By: Carlyle Holdings I GP Inc., its managing member
By:	/s/ R. Rainey Hoffman, attorney-in-fact
	Name:	Daniel D'Aniello
	Title:	Chairman
TC GROUP SUB L.P. By: TC Group, L.L.C., its general partner By: Carlyle Holdings I L.P., its managing member By: Carlyle Holdings I GP Sub L.L.C., its general partner By: Carlyle Holdings I GP Inc., its managing member
By:	/s/ R. Rainey Hoffman, attorney-in-fact
	Name:	Daniel D'Aniello
	Title:	Chairman