Filed under Rule 424(b)(2), Registration Statement No. 333-183535
Preliminary Pricing Supplement No. 66 - Dated Monday, December 22, 2014 (To: Prospectus dated August 24, 2012)
| CUSIP | Principal | Selling | Gross | Net | Coupon | Coupon | Coupon | Maturity | 1st Coupon | 1st Coupon | Survivor's | Product |
| Number | Amount | Price | Concession | Proceeds | Type | Rate | Frequency | Date | Date | Amount | Option | Ranking |
| 02006DFN6 | [] | 100.000% (1) | 1.125% | [] | Fixed | 3.200% | Monthly | 01/15/2018 | 02/15/2015 | $3.82 | Yes | Senior Unsecured Notes |
| Redemption Information: Callable at 100% on 1/15/2016 and Monthly thereafter with 30 Calendar Days Notice. | ||||||||||||
| (1) Investment advisers, either registered under the Investment Advisers Act of 1940 or exempt therefrom, purchasing Notes for the account of their advisory clients may be offered Notes at a 0.4500% discount to the public offering price. | ||||||||||||
| 02006DFP1 | [] | 100.000% (2) | 1.700% | [] | Fixed | 3.800% | Monthly | 01/15/2020 | 02/15/2015 | $4.54 | Yes | Senior Unsecured Notes |
| Redemption Information: Callable at 100% on 1/15/2016 and Monthly thereafter with 30 Calendar Days Notice. | ||||||||||||
| (2) Investment advisers, either registered under the Investment Advisers Act of 1940 or exempt therefrom, purchasing Notes for the account of their advisory clients may be offered Notes at a 0.7500% discount to the public offering price. | ||||||||||||
| Ally Financial Inc. | Offering Date: Monday, December 22, 2014 through Monday, December 29, 2014 | Ally Financial Inc. |
| Trade Date: Monday, December 29, 2014 @ 12:00 PM ET | Ally Financial Term Notes, Series A | |
| Settle Date: Friday, January 2, 2015 | Prospectus dated August 24, 2012 | |
| 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. |