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Vintage photos: How presidential limos evolved from open convertibles to Biden's armored Cadillac

President Ronald Reagan waves from the back of his limousine in 1984.Ronald Reagan Library/Getty Images US presidents used to ride in unarmored convertibles with open roofs. After John F. Kennedy's assassination, presidential cars were customized with safety features. Today's presidential limousine is a 20,000-pound, $1.5 million Cadillac known as "The Beast." US presidents used to ride around in open convertibles. Today, President Joe Biden is driven in a 20,000-pound, $1.5 million armored Cadillac known as "The Beast." Take a look at how presidential limousines have changed through the years. Presidential cars replaced horses and carriages in the early 20th century. President William McKinley rides in an automobile in 1896.Photo12/Universal Images Group via Getty Images President William McKinley, who served from 1897 to 1901, was the first US president to ride in a car, according to the National Archives. The administration of President Theodore Roosevelt, who succeeded McKinley after his 1901 assassination, was the first to include a government-owned car. In 1941, President Franklin D. Roosevelt became the first president to ride in an armored vehicle — a limousine that previously belonged to gangster Al Capone. President Franklin D. Roosevelt rides in a car with bulletproof glass in 1942.Bettmann/Contributor/Getty Images Roosevelt previously drove around in a 1936 Packard Touring Limousine. Then, in 1941, he upgraded to an automobile with bulletproof glass that the Treasury Department had seized from Capone in 1932, according to the US Secret Service. President Dwight Eisenhower's presidential limousine was a 1955 Chrysler Crown Imperial. President Dwight Eisenhower waves to cheering crowds in 1955.Bettmann/Contributor/Getty Images The car featured a 250-horsepower V8 engine and a sunroof, according to the US Secret Service. President John F. Kennedy's assassination in the back of a 1961 Lincoln Continental changed presidential cars forever. President John F. Kennedy, and first lady Jacqueline Kennedy ride through Dallas in 1963. Minutes later, Kennedy was assassinated as his car passed through Dealey Plaza.Bettmann/Contributor/Getty Images Kennedy's limousine included a hydraulic seat that could be raised 10.5 inches for a better view of the president, but no protective features. After Kennedy's assassination, presidential cars were customized to prioritize the safety of the commander-in-chief with thick layers of armor.

Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

2021 Cadillac Escalade vs. 2020 Lincoln Navigator | How they compare on paper

The 2021 Cadillac Escalade arrived late last night, and we all know what that means: It’s comparison time. Specifically, weÂ’re pitting the new Escalade versus the 2020 Lincoln Navigator. The sales gap between the long-time competitors has grown dangerously close for Cadillac ever since the revolutionary new Navigator came out for the 2018 model year. In 2019, the Navigator was only about 4,000 units down from the Escalade. Cadillac intends to widen that gap back up with a new truck, and now itÂ’s time to see if itÂ’s brought the right goods to the party. With the redesigned model that now features an independent rear suspension, these two are more alike than theyÂ’ve been in a long time. The Escalade was stuck with the less space-efficient solid rear end up until now, as GM hadnÂ’t yet made the switch to IRS that Ford long-ago did. Now that it has, these two are super similar from a dimensions perspective. Cadillac was playing catch-up in this fight, so it knew exactly where it needed to aim to come out victorious in a specs battle such as this one. A quick note on the chart below. Both of these models have a “regular” and “long” version. The EscaladeÂ’s long variant is still named ESV, and the NavigatorÂ’s long version is simply named L. In the dimensions section, we distinguish between the two with a “/” — the “regular” length version is on the left, and the “long” version is on the right side of the slash. The numbers are below: Powertrain The Lincoln Navigator still reigns supreme when it comes to power, as the 3.5-liter twin-turbo V6 is high on both horsepower and torque. GMÂ’s small-block V8 comes close, but ultimately falls short by 30 horsepower and 50 pound-feet of torque to the twin-turbo V6. Cadillac does have an ace up its sleeve, though. It comes in the form of the 3.0-liter turbo-diesel inline-six engine. Lincoln hasnÂ’t dropped the PowerStroke diesel into the Navigator (and we'd be shocked if it does), so Cadillac has a unique offering in this segment now. The diesel will be optional on the Escalade, but it has less horsepower and the same amount of torque as the V8. We expect the big advantage for the diesel will come in fuel economy, an area where the Silverado Duramax diesel currently outpaces the full-size truck competition. Both of these big SUVs come standard with 10-speed automatic transmissions. Intriguingly, itÂ’s the 10-speed automatic that was co-developed between Ford and GM.