#engineering

It was time for a new styling theme at Cadillac in 1959, when lead designer Harley Earl reached mandatory retirement age. Bill Mitchell, longtime right hand man and team succeeded Earl and implemented immediate styling changes. Some of those - like huge fins - were to compete with Chrysler and Imperial designs, but others were an effort at streamlining and modernization; moving away from post-War looks. Today we’ll take a look at the changes underneath these grandiose and (often) pink metallic bodies.

We’re back with more Cadillac Eldorado today, in our final entry on the third generation models. We spent our last installment reviewing the special and sometimes troublesome engineering that was standard on the Brougham. Since then, I discovered this April 1957 edition of The Cadillac Serviceman, GM’s in-house magazine publication for its dealer service centers. Twelve clearly scanned pages of technical and service detail await you! After reading, return here and learn about the changes made to the Eldorado line in 1958.

We’re back with more Cadillac Eldorado coverage this week. In our last installment (over a month ago) we reviewed the interior accouterments of the Eldorado Brougham that were far beyond the standard Eldorado. Aside from its coach door hardtop body style, the other area where the Brougham went its own way was in engineering. And some of that engineering was of the experimental variety. What could go wrong?

In our last installment of Rare Rides, we checked out the interior changes Cadillac’s engineers and designers made for the new and improved third generation Eldorado in 1957. And while the interior of the standard Eldorados that year was largely shared with the rest of the Cadillac lineup, there was an exception: Eldorado Brougham. Like we saw previously with the Brougham’s mix-and-match approach in use of old and new exterior styling cues, the interior went its own direction as well.

We spent our last installment reviewing the more modern exterior styling of the 1957 Eldorado Seville, and new-yet-dated looking Eldorado Brougham. Those two followed our coverage of the Eldorado Biarritz, which was unable to adopt Cadilac’s 1957 roof and pillars design because of its canvas roof. This week we step inside the Eldorado, and see how removed it was from the 1956 models.

Last week in our Cadillac Eldorado saga, we covered the visual updates in the new-for-’57 Eldorado Biarritz. Part of a styling revision across the line at Cadillac that year, the Eldorado in particular drifted away from the bulbous fenders and tall hood shapes that were a hallmark of post-WWII American car design. But there were two more Eldorados in 1957! One of them looked more daring than the Biarritz, and the other looked almost like it was from the past.

As we learned in our previous installment, the third generation Eldorado debuted in 1957 with a daring new X-frame chassis design. Launched across the entire Cadillac lineup that year, the X-frame would become controversial in short order due to safety concerns in side-impact crashes. Up top, Cadillac decided to make less controversial styling changes on the 1957 Eldorados. Designers advanced a styling theme that would reach its fin-happy and chrome bedazzled crescendo a couple of years later.

As we learned in our last installment, the Cadillac lineup was revised visually for 1957, and would be revised again in 1958 once quad headlamps became legal. Fins grew, hoods smoothed, roofs leaned backward, and there were more Eldorado variants than ever before. But styling and lineup changes weren’t the only new features in 1957: Cadillac was also eager to tout its Standard of the World engineering, safety, and engine advancements!

With Stellantis vowing to launch a slew of all-electric and hybrid vehicles by 2030, many are wondering how this will impact the lineup in North America. The company has repeatedly alluded to eliminating the HEMI V8 in favor of the more-European Hurricane 3.0-liter straight-six. While this is clearly being done to comply with emissions regulations without having to sacrifice power, plenty have bemoaned the company’s decision to abandon V8 powertrains whilst pivoting toward electrification. 

But Micky Bly, senior vice president and head of global propulsion systems for Stellantis, recently assured the public that the company doesn’t intend on dumping combustion engines overnight. It’s even going to keep a few of Chrysler’s oldest units around — just with some improvements designed to meet the relevant emissions standards. 

We return to the Turbo-Hydramatic once more today, and our third installment sees us at a critical point in the timeline of the automatic transmission. Fuel economy pressure from the government and performance demands of the consumer increased considerably in the intervening years since the THM’s debut in 1964. That meant the creation of lighter, more compact, and cheaper versions of the Turbo-Hydramatic compared to its flagship shifter, the THM400. GM branched out into the likes of the THM350, THM250, and the very problematic THM200.

In 1987, GM stepped away from the traditional THM naming scheme and switched to a new combination of letters and numbers. Number of gears, layout, and strength combined to turn the THM400 into the 3L80. But the hefty gearbox was already limited by then to heavier truck applications; passenger cars moved on to four forward gears after the dawn of the Eighties.

Our Abandoned History coverage of the Turbo-Hydramatic transmission series continues today. The THM was a singular solution to two different automatic transmissions in use by Oldsmobile, Cadillac, and Buick in 1963. Turbo-Hydramatic arrived at a time of modernization for the automatic, which prior to the mid-Sixties was regarded as inefficient and less than smooth.

The THM400 was the 1964 replacement for the Hydra-Matic and Buick’s Dynaflow and established itself as a smooth and reliable gearbox. It proved useful in a variety of luxury and heavy-duty applications and shrugged off weight and torque easily. In short order, it took off as the transmission of choice for various small manufacturers outside of GM. However, no matter how excellent the THM400 was, it found itself squeezed by a drive toward greater fuel efficiency. It was also a bit hefty to be of broad use in smaller or lighter passenger cars. GM needed more Turbo-Hydramatics!

A few weeks ago, we concluded Abandoned History’s two-part coverage of the Chrysler UltraDrive transmission. Within the comments was a request for more transmission coverage of an equally abandoned nature. Let it be so! Come along as we discuss the vast automatically shifted expanse that was the Turbo-Hydramatic transmission family, by General Motors.

We finish up our Abandoned History coverage of the long-lived UltraDrive transmission today. The pursuit of simplification, modernization, less weight, and better fuel economy lead to the creation of the electronically controlled four-speed A604 marketed as UltraDrive. The idea floated around at Chrysler in the Seventies and then was greenlit and put into production (before it was ready) by an eager Lee Iacocca. A case of unfortunate timing, the new transmission arrived in 1989 at a time when there was almost no exciting news in Chrysler’s product portfolio. Thus the UltraDrive name was coined by marketing, and the new and advanced transmission was featured heavily in the company’s PR materials in 1989 and 1990.

The UltraDrive’s debut version was prone to numerous types of failures because of fluids and sensors, build quality, parts, really everything. But engineers at Chrysler quickly massaged the A604 into the improved 41TE that was ready for use midway through the 1990 build year. UltraDrive was up and running within acceptable reliability standards per Chrysler. Clearly, it was time to create more UltraDrive variations!

The recent Rare Rides Icons post on the 1990 Chrysler Imperial Super-K Gingerbread Cookie Edition generated a few comments not only about the subject in question but its four-speed UltraDrive transmission. It seems more than one of you wants a discussion – no – an essay on the UltraDrive. Wish granted! Here we go.