![]() The GM TH700R4 is a longitudinally placed four-speed automatic-shift overdrive transmission installed inside Chevrolet and GMC trucks and cars. General Motors made concerted efforts to boost their automotive engines’ fuel efficiency and produced the 700R4 transmission. ![]() The latter 700R4 variant had a more giant input shaft with 30 splints. GM produced dual variants or versions of 700R4 – the earlier editions came with a 27-splint shaft. The 700R4 also had a higher 1st gear ratio than its predecessor (3.06 against 2.52), which improved acceleration. The GM Turbo Hydra-Matic 700R4 featured a vastly upgraded and advanced architecture than the TH350 with better fuel efficiency. Launched in 1982 to replace the THM350, the 700R4 wholly phased out the former transmission by 1984. The 4L60E is the computerized or digital version of TH700R4 released in 1982 that became 4L60E in 1990. This robust 4-speed automatic transmission is presently regarded as the most versatile and powerful overdrive transmission ever made.Ī relentless endeavor by General Motors to improve the design of existing automatic transmissions led to the 4L60E’s emergence. The General Motors 4L60E transmission has a 425lb/ft torque with a horsepower rating of up to 450 HP. The 4L60E Transmissions from GM are automatic 4-speed overdrive longitudinal mounted transmissions featuring five gears, four forward, and one reverse. The Chevy featuring a small-block engine and a bolt-on bell housing, came equipped with the initial 4L60E transmission. This electronic transmission also featured a digital speed sensor for conveying information to the vehicle’s speedometer. 4L60’s electronic variant came with an automatic powertrain control module, unlike the mechanically-operated hydraulic transmission. ![]() The 4L60 transmission with the suffix ‘E’ first emerged in 1993 to distinguish it from its earlier hydraulic version. The “4” in 4L60 indicates the total number of forwarding gears, “L” stands for longitudinal mounting, and “60” signifies torque capability. And that is how the 700R4 saw the light of the day and was later rechristened as 4L60. General Motors wanted to do away with lightweight 3-speed transmissions and introduce a fuel-efficient 4-speed automatic transmission. The GM 4L60E is the electronic version of the 4L60, which was introduced as 700R4 in 1982. The longitudinal placement of the GM TH400 automatic transmission ensures an excellent power ratio and smooth and durable rear-wheel drive. The TH400 transmission speaking is a three-speed, automatic-shift longitudinally set transmission constructed durably for long-term use. General Motors brought out the TH400 transmission earlier than the automatic transmission models like TH350, 700R4, and 4L60E. Thanks to its robust build and reliability, this automatic transmission later found its way into Camaro, Corvette, and Chevelle engines. The THM400 transmission became the default transmission of Oldsmobile, Chevrolet, Ferrari, and Jaguar cars within a year of its launch. General Motors released the THM400 automatic transmission mainly to replace the standard ST300 2-speed automatic transmission. The TH400 was the foremost amongst General Motors’ three-speed transmissions that debuted in 1964, appearing under the hood of Cadillac. The TH400 was the foremost amongst General Motors’ three-speed transmissions. Read more: Can I Push Start an Automatic Car? What Are The Alternatives? GM TH400 (or ‘Turbo 400’) The THM350 found widespread application, especially in small-block V8 and V6 engines owing to the transmission’s solidness, versatility, and power. Almost all GM cars and trucks (rear-wheel-drive) produced from 1969 till 1984 carried the THM350. The THM350 is often called CBC 350 as GM’s Buick and Chevrolet divisions joined hands to develop the TH350. The GM THM350 became so popular that the transmission paved the way for launching a series of sophisticated automatic transmissions in due course. General Motors accomplished a high level of perfection in automatic transmission with the TH350. GM developed and promoted the three-speed automatic-shift transmission to replace the standardized two-speed transmission-Powerglide. GM’s Buick and Chevrolet divisions designed the THM350 primarily for its Chevrolet trucks and cars (1969-1986), having small-block engines. The GMC Turbo Hydra-Matic 350, famous as “Turbo 350,” first appeared in 1969 to replace the GM’s two-speed Powerglide transmission. The TH350 is a 3-speed transmission with a higher 1st gear ratio (2.52:1) and a provisional 2nd gear, facilitating enhanced initial momentum for drag racing and everyday driving.
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