Difference between revisions of "Chevrolet Impala"

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Engine availability was reduced in 1977 when the V6 was introduced with {{Convert|110|HP}}. Other options included {{convert|267|cuin|L|adj=on|sigfig=2}} and {{convert|305|cuin|L|adj=on|sigfig=2}} V8 engines. The {{convert|350|cuin|L|adj=on|sigfig=2}} V8 engine was optional in some years. [[Oldsmobile]]'s {{convert|350|cuin|L|adj=on|sigfig=2}} V8 [[diesel]] engine also was available.
Engine availability was reduced in 1977 when the V6 was introduced with {{Convert|110|HP}}. Other options included {{convert|267|cuin|L|adj=on|sigfig=2}} and {{convert|305|cuin|L|adj=on|sigfig=2}} V8 engines. The {{convert|350|cuin|L|adj=on|sigfig=2}} V8 engine was optional in some years. [[Oldsmobile]]'s {{convert|350|cuin|L|adj=on|sigfig=2}} V8 [[diesel]] engine also was available.


In 1980, a slight facelift took place, although the body style remained the same, and all the sheet metal was changed. From 1980-1990, all GM B-bodies shared similar doors that can be replaced by removing model-specific trim pieces.{{Fact|date=February 2007}}
In 1980, a slight facelift took place, although the body style remained the same, and all the sheet metal was changed. From 1980-1990, all GM B-bodies shared similar doors that can be replaced by removing model-specific trim pieces.


Although the Impala (and the upscale Caprice) sold well into the early 1980s, the Impala was more of an entry-level vehicle along with fleet usage - especially with law enforcement. The Impala was discontinued in 1985, while the Caprice continued unchanged until 1990. The Caprice received a major redesign in 1991 and continued until 1996.
Although the Impala (and the upscale Caprice) sold well into the early 1980s, the Impala was more of an entry-level vehicle along with fleet usage - especially with law enforcement. The Impala was discontinued in 1985, while the Caprice continued unchanged until 1990. The Caprice received a major redesign in 1991 and continued until 1996.
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The 1994 Impala SS went into production 14 months later at GM's plant in [[Arlington, Texas]], and was almost identical cosmetically to the concept car, the only noticeable change being the chromed bowtie logo on the grill (vs a red logo on the concept). The car was, in essence, a high-performance version of the Caprice. From a mechanical standpoint, it used the Caprice [[9C1]] police package as its base and as such got most of the equipment formerly available only to law enforcement and government agencies. This included a sport-tuned suspension with reinforced shocks and struts, a high-capacity upgraded reverse flow cooling system, larger and more powerful four-wheel disc brakes, transmission cooler, dual exhaust, a higher-output electrical system, and other minor mechanical alterations. Not all of the police equipment was carried over however, as the Impala SS did not get the external oil-to-air engine oil cooler, nor were all the body mounts secured (the standard Caprice and Impala SS were assembled at the factory with the front 3 body mounts missing one of the rubber cushions, while the 9C1 was assembled with all rubber cushions in place), although both are popular aftermarket additions to the Impala SS by their owners.  
The 1994 Impala SS went into production 14 months later at GM's plant in [[Arlington, Texas]], and was almost identical cosmetically to the concept car, the only noticeable change being the chromed bowtie logo on the grill (vs a red logo on the concept). The car was, in essence, a high-performance version of the Caprice. From a mechanical standpoint, it used the Caprice [[9C1]] police package as its base and as such got most of the equipment formerly available only to law enforcement and government agencies. This included a sport-tuned suspension with reinforced shocks and struts, a high-capacity upgraded reverse flow cooling system, larger and more powerful four-wheel disc brakes, transmission cooler, dual exhaust, a higher-output electrical system, and other minor mechanical alterations. Not all of the police equipment was carried over however, as the Impala SS did not get the external oil-to-air engine oil cooler, nor were all the body mounts secured (the standard Caprice and Impala SS were assembled at the factory with the front 3 body mounts missing one of the rubber cushions, while the 9C1 was assembled with all rubber cushions in place), although both are popular aftermarket additions to the Impala SS by their owners.  


The Impala SS was uniquely fitted with a standard 3.08 gear. The limited-slip rear differential was standard (as opposed to the option GU8 on caprices) and suspension that was an inch lower. A retuned [[GM LT engine#LT1|LT1]] {{convert|5.7|L|cuin|sp=us|adj=on}} [[Chevrolet Small-Block engine|small-block]] V8 was standard on the Impala SS, making {{convert|260|hp}} and {{convert|330|lbft}} of [[torque]] (retuned from the prototype's {{convert|300|hp}} rating). The primary difference between the LT1 in the Impala and the LT1 that was in the Corvette and Camaro was that the Impala engine was fitted with cast-[[iron]] cylinder heads instead of [[aluminum]] ones, and a camshaft that was designed more for low-end torque than high-end horsepower. Another difference was that the Impala LT1 had 2 bolt main bearing caps while the Corvette LT1 had 4 bolt main bearing caps. The transmission used in the car was the [[GM 4L60-E transmission|4L60E]], which was itself an upgraded and revised version of the previous 700R4.  However, the transmission was not beefed up for the power of the LT1, and transmission failures after {{convert|100000|mi}} were commonplace. {{Fact|date=September 2007}}
The Impala SS was uniquely fitted with a standard 3.08 gear. The limited-slip rear differential was standard (as opposed to the option GU8 on caprices) and suspension that was an inch lower. A retuned [[GM LT engine#LT1|LT1]] {{convert|5.7|L|cuin|sp=us|adj=on}} [[Chevrolet Small-Block engine|small-block]] V8 was standard on the Impala SS, making {{convert|260|hp}} and {{convert|330|lbft}} of [[torque]] (retuned from the prototype's {{convert|300|hp}} rating). The primary difference between the LT1 in the Impala and the LT1 that was in the Corvette and Camaro was that the Impala engine was fitted with cast-[[iron]] cylinder heads instead of [[aluminum]] ones, and a camshaft that was designed more for low-end torque than high-end horsepower. Another difference was that the Impala LT1 had 2 bolt main bearing caps while the Corvette LT1 had 4 bolt main bearing caps. The transmission used in the car was the [[GM 4L60-E transmission|4L60E]], which was itself an upgraded and revised version of the previous 700R4.  However, the transmission was not beefed up for the power of the LT1, and transmission failures after {{convert|100000|mi}} were commonplace.  


Several other cars in the B-body line also shared a similar powertrain: these were the Chevrolet Caprice, [[Buick Roadmaster]], and the [[Cadillac Fleetwood]] which all shared the LT1 engine and 4L60E [[automatic transmission]].
Several other cars in the B-body line also shared a similar powertrain: these were the Chevrolet Caprice, [[Buick Roadmaster]], and the [[Cadillac Fleetwood]] which all shared the LT1 engine and 4L60E [[automatic transmission]].
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