September U.S. auto sales were released on Tuesday, which saw the big three U.S. automakers top projections. 

Fiat Chrysler (FCAU) - Get Report reported a drop 9.7% drop in light vehicles deliveries, beating analysts' projections for a 13% decline. Shares of Fiat Chrysler were falling during Tuesday afternoon trading. 

Year-over-year sales among its brands for September were: Jeep sales sunk 4%, Chrysler sales fell 16%, Dodge sales plunged 30%, and Ram sales were roughly flat. Fleet sales dropped 41% to 27,362 units.

Ford (F) - Get Report said light vehicle deliveries increased 8.9% year-over-year, smashing projections for a 2.3% uptick. Shares of Ford were climbing over 2% in Tuesday afternoon trading on heavy trading volume of about 51 million shares versus the monthly average of around 33 million. 

Breaking down Ford's results for the month year-over-year, truck sales jumped 19.9%, SUV sales rose 1.8%, but car sales sunk 1.3%.

General Motors (GM) - Get Report reported stronger-than-expected September sales figures as well, reporting an 11.9% increase year-over-year, beating analysts' estimates for a 7.9% jump. Shares of GM were spiking over 3% in Tuesday afternoon trading on Thursday on heavy trading volume of about 24 million shares versus the monthly average of roughly 12.5 million. GM's strong performance was driven by year-over-year gains of 17% at Chevrolet and 9% at GMC.

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