Allison Transmission Announces Sale of 15,000,000 Shares of Common Stock by Selling Stockholders

 Allison Transmission Announces Sale of 15,000,000 Shares of Common Stock by
                             Selling Stockholders

PR Newswire

INDIANAPOLIS, Nov. 11, 2013

INDIANAPOLIS, Nov.11, 2013 /PRNewswire/ --Allison Transmission Holdings,
Inc. (NYSE: ALSN), announced today the sale of 15,000,000 shares of its common
stock by investment funds affiliated with The Carlyle Group and Onex
Corporation (the "Sponsors"). All of the shares are being sold on a pro rata
basis by the Sponsors, which are existing stockholders of Allison Transmission
Holdings, Inc. ("Allison"), in accordance with their current interests.
Allison will not receive any of the proceeds from the offering of shares by
the Sponsors. Closing of the offering is expected to occur on or about
November 15, 2013, subject to customary closing conditions.

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Credit Suisse Securities (USA) LLC is acting as the sole underwriter for the
offering. Credit Suisse Securities (USA) LLC proposes to offer the shares of
common stock from time to time to purchasers directly or through agents, or
through brokers in brokerage transactions on the New York Stock Exchange, or
to dealers in negotiated transactions or in a combination of such methods of
sale, at a fixed price or prices, which may be changed, or at market prices
prevailing at the time of sale, at prices related to such prevailing market
prices or at negotiated prices.

Allison, its directors and certain of its executive officers and each of the
Sponsors have agreed to be subject to a "lock-up" period of 60 days from the
pricing of the offering (subject to certain exceptions, including the sale of
shares pursuant to plans that satisfy the requirements of Rule 10b5-1(c)(1)
under the Exchange Act, and the underwriter's ability to waive lock-up
restrictions).

Following the offering, the Sponsors will continue to beneficially own an
aggregate of approximately 111,892,500 shares, or approximately 61.4% in the
aggregate, of Allison's outstanding common stock after giving effect to the
offering.

Allison has filed a registration statement (including a prospectus) with the
U.S. Securities and Exchange Commission (the "SEC") for the offering to which
this communication relates. Before you invest, you should read the prospectus
in that registration statement and other documents Allison has filed with the
SEC for more complete information about Allison and this offering. You may get
these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov.
Alternatively, Credit Suisse Securities (USA) LLC will arrange to send you the
prospectus if you request it by calling toll-free 1-800-221-1037 or by
emailing newyork.prospectus@credit-suisse.com.

This press release shall not constitute an offer to sell or the solicitation
of an offer to buy, nor shall there be any sale of these securities in any
state or jurisdiction in which such offer, solicitation or sale would be
unlawful prior to registration or qualification under the securities laws of
any such state or jurisdiction.

About Allison Transmission

Allison Transmission (NYSE: ALSN) is the world's largest manufacturer of fully
automatic transmissions for medium- and heavy-duty commercial vehicles and
hybrid-propulsion systems for city buses. Allison transmissions are used in a
variety of applications including refuse, construction, fire, distribution,
bus, motorhomes, defense and energy. Founded in 1915, the company is
headquartered in Indianapolis, Indiana, USA and employs approximately 2,800
people worldwide. With a market presence in more than 80 countries, Allison
has regional headquarters in the Netherlands, China and Brazil with
manufacturing facilities in the U.S., Hungary and India. Allison also has
approximately 1,400 independent distributor and dealer locations worldwide.

Forward-Looking Statements

This press release may contain forward-looking statements. All statements
other than statements of historical fact contained in this press release are
forward-looking statements, including all statements regarding future
financial results. In some cases, you can identify forward-looking statements
by terminology such as "may," "will," "should," "expect," "plans," "project,"
"anticipate," "believe," "estimate," "predict," "intend," "forecast," "could,"
"potential," "continue" or the negative of these terms or other similar terms
or phrases. Forward-looking statements are not guarantees of future
performance and involve known and unknown risks. Factors which may cause the
actual results to differ materially from those anticipated at the time the
forward-looking statements are made include, but are not limited to: risks
related to our substantial indebtedness; our participation in markets that are
competitive; general economic and industry conditions; our ability to prepare
for, respond to and successfully achieve our objectives relating to
technological and market developments and changing customer needs; the failure
of markets outside North America to increase adoption of fully-automatic
transmissions; the discovery of defects in our products, resulting in delays
in new model launches, recall campaigns and/or increased warranty costs and
reduction in future sales or damage to our brand and reputation; the
concentration of our net sales in our top five customers and the loss of any
one of these; risks associated with our international operations; brand and
reputational risks; our intention to pay dividends; and labor strikes, work
stoppages or similar labor disputes, which could significantly disrupt our
operations or those of our principal customers. Although we believe the
expectations reflected in such forward-looking statements are based upon
reasonable assumptions, we can give no assurance that the expectations will be
attained or that any deviation will not be material. All information is as of
the date of this press release, and we undertake no obligation to update any
forward-looking statement to conform the statement to actual results or
changes in expectations.

SOURCE Allison Transmission Holdings, Inc.

Contact: Investor Relations, (317) 242-3078, ir@allisontransmission.com, Media
Relations, (317) 242-5000, media@allisontransmission.com