Filed under Rule 424(b)(2), Registration Statement No. 333-183535

Preliminary Pricing Supplement No 23 - Dated Monday, August 26, 2013 (To: Prospectus dated August 24, 2012)

CUSIP Principal   Gross Net Coupon Coupon Coupon Maturity 1st Coupon 1st Coupon Survivor's Product
Number Amount Selling Price Concession Proceeds Type Rate Frequency Date Date Amount Option Ranking
02006DBZ3 [] 100.000% 1.125% [] Fixed 3.300% Monthly 09/15/2016 10/15/2013 $3.58 No Senior Unsecured Notes
Redemption Information: Callable at 100% on 9/15/2014 and Monthly thereafter with 30 Calendar Days Notice.
02006DCA7 [] 100.000% 1.700% [] Fixed 4.550% Monthly 09/15/2018 10/15/2013 $4.93 No Senior Unsecured Notes
Redemption Information: Callable at 100% on 9/15/2014 and Monthly thereafter with 30 Calendar Days Notice.

Ally Financial Inc.

Offering Date: Monday, August 26, 2013 through Tuesday, September 3, 2013

Trade Date: Tuesday, September 3, 2013 @ 12:00 PM ET

Settle Date: Friday, September 6, 2013

Minimum Denomination/Increments:$1,000.00/$1,000.00

Initial trades settle flat and clear SDFS: DTC Book Entry only

DTC Number 0235 via RBC Dain Rauscher Inc
  

Agents: Incapital, LLC, Citigroup, RBC Capital Markets, Morgan Stanley, J.P. Morgan
  

If the maturity date or an interest payment date for any note is not a business day (as term is defined in prospectus), principal, premium, if any, and interest for

that note is paid on the next business day, and no interest will accrue from, and after, the maturity date or interest payment date.

Ally Financial Inc.

Ally Financial Term Notes, Series A

Prospectus dated August 24, 2012