1995 Chevrolet Impala Ss Specs – A Deep Dive Into The Legendary
The 1995 Chevrolet Impala SS is a hallmark of American automotive engineering, representing the pinnacle of the full-size B-Body platform. This guide provides a comprehensive breakdown of the technical data, performance metrics, and mechanical nuances that define this iconic high-performance sedan for owners and enthusiasts alike.
If you have ever spent a Saturday afternoon under the hood of a GM classic, you know that the mid-90s were a unique era for domestic muscle. The 1995 model year is particularly special because it refined the formula introduced in 1994, offering a perfect blend of old-school presence and modern fuel injection. Understanding the 1995 chevrolet impala ss specs is the first step toward maintaining or restoring one of these “Darth Vader” sedans to its former glory.
In this article, we will go beyond simple numbers. We will explore the heavy-duty cooling systems, the specific gear ratios of the 4L60-E transmission, and the suspension geometry that allowed a 4,000-pound car to handle like a much smaller machine. Whether you are a seasoned DIYer or a potential buyer, this technical deep dive has you covered.
Analyzing the 1995 chevrolet impala ss specs: Powertrain and Performance
The heart of the Impala SS is undoubtedly the 5.7-liter LT1 V8 engine. While it shares a name with the engine found in the Corvette and Camaro of the same era, the Impala version features specific modifications for heavy-duty use. The most notable difference is the use of cast-iron cylinder heads rather than the aluminum units found on the F-body and Y-body platforms.
The cast-iron heads were chosen for their durability and better heat dissipation in high-load scenarios, which was essential given the car’s 4,060-pound curb weight. When you look at the 1995 chevrolet impala ss specs for the engine, you will find a power output of 260 horsepower at 5,000 RPM and a massive 330 lb-ft of torque at 3,200 RPM. This low-end torque is what gives the Impala its signature “stoplight-to-stoplight” punch.
Another critical component is the reverse-flow cooling system. Unlike traditional engines that send coolant to the block first, the LT1 sends it to the cylinder heads first. This allows for higher compression ratios (10.4:1) without the risk of pre-detonation. If you are performing a coolant flush, remember that these engines have two specific bleeder valves on the thermostat housing and the heater hose to prevent air pockets.
The Infamous Optispark Ignition System
You cannot discuss the LT1 without mentioning the Optispark distributor. Located behind the water pump, this optical trigger is responsible for high-resolution timing. In 1995, Chevrolet updated the Optispark to a vented design. This was a massive improvement over the 1994 model, as it used vacuum lines to pull moisture out of the distributor cap, significantly increasing its lifespan.
If you are experiencing a “no-start” condition or a high-RPM stumble, the Optispark is often the primary suspect. When replacing it, always use a high-quality dielectric grease on the electrical connectors and ensure the vacuum lines are clear. It is a labor-intensive job, but a vented Optispark is much more reliable than its predecessor.
Transmission and Drivetrain: Handling the Torque
The 1995 chevrolet impala ss specs include the 4L60-E four-speed automatic transmission. This was one of GM’s first fully electronically controlled transmissions, allowing for precise shift points and firmness adjustments via the Powertrain Control Module (PCM). For 1995, the 4L60-E received a new pulse-width modulated (PWM) torque converter clutch, which allowed for smoother engagement.
The rear-end of the Impala SS is just as robust. It features an 8.5-inch 10-bolt differential equipped with a limited-slip posi-traction unit (RPO code G80). The standard gear ratio for the 1995 model was 3.08:1. While this was great for highway cruising and fuel economy, many DIYers swap these for 3.73 gears to wake up the car’s acceleration.
Heat is the number one killer of the 4L60-E. The Impala SS came factory-equipped with an external transmission cooler located in front of the radiator. If you plan on towing or aggressive driving, upgrading to a larger stacked-plate cooler is a cheap insurance policy for your transmission. Always check your fluid color; it should be bright red, not burnt or brown.
Suspension and Braking: The 9C1 Police Influence
One reason the Impala SS handles so well for its size is its DNA. It is essentially a civilian version of the 9C1 police package Caprice. The 1995 chevrolet impala ss specs for the suspension include a 1-inch lower ride height compared to a standard Caprice, achieved through stiffer, shorter coil springs.
The car also utilizes De Carbon gas-pressurized shocks and thicker front and rear sway bars. These components work together to minimize body roll during hard cornering. If you are refreshing the suspension, look for polyurethane bushings to replace the aging rubber ones. This will sharpen the steering response and make the car feel much more planted on the road.
Stopping power is provided by four-wheel disc brakes. The front rotors are 12 inches in diameter, while the rears are 10.15 inches. Interestingly, the Impala SS uses a specific proportioning valve that differs from the drum-brake Caprice. If you feel the rear of the car “squatting” too much under braking, it may be time to inspect the caliper sliders for seizing, a common issue on these B-bodies.
Wheels and Tires: The Five-Spoke Signature
The 17-inch brushed aluminum wheels are perhaps the most recognizable feature of the 1995 Impala SS. These 17×8.5-inch rims were massive for their time. The factory tire spec was a 255/50ZR17 BFGoodrich Comp T/A. Finding this exact tire size today can be challenging, but several manufacturers still produce high-performance rubber in this fitment.
When rotating your tires, pay attention to the lug nut torque. These wheels should be torqued to 100 lb-ft in a star pattern. Using an impact wrench without a torque stick can lead to warped rotors or stripped studs, which is a headache you definitely want to avoid on a classic like this.
Interior Comfort and Exterior Design: The “Darth Vader” Aesthetic
The 1995 model year brought some significant changes to the interior that many enthusiasts prefer over the 1994 version. Most notably, the gear shifter moved from the steering column to the center console. This gave the car a much more sporty, cockpit-like feel. However, unlike the 1996 model, the 1995 still retained the digital instrument cluster.
The seats are wrapped in grey leather with the “SS” logo embroidered on the headrests. For the exterior, 1995 saw the addition of two new colors. While 1994 was only available in Black, the 1995 chevrolet impala ss specs expanded to include Dark Cherry Metallic and Dark Grey Green Metallic. The mirrors were also updated from a “pedestal” mount to a more aerodynamic “folding” design integrated into the A-pillar.
Maintaining the exterior trim is vital. The “Impala SS” badges and the unique grille are prone to fading if left in the sun. Using a high-quality UV protectant on the plastic trim pieces will prevent them from turning grey. If you are a DIYer looking to spruce up the look, a simple clay bar treatment and a ceramic coating can make that factory paint pop like it did in 1995.
Maintenance Guide: Keeping Your B-Body on the Road
Owning a classic means staying ahead of the maintenance curve. The 1995 Impala SS is a reliable machine, but it has a few “quirks” that require attention. One of the most common issues is the fuel pump. Accessing the fuel pump requires dropping the entire 23-gallon fuel tank, which is a heavy job. If you hear a loud whining noise from the rear of the car, start planning your replacement.
Another area to watch is the heater core. Because the LT1 uses Dex-Cool (or was designed for it), the cooling system can develop “sludge” if not maintained. This sludge often clogs the heater core, leading to a lack of heat in the cabin. Periodically flushing the heater core separately from the engine can save you the nightmare of removing the entire dashboard.
- Oil Change: 5 quarts of 5W-30 with a high-quality filter every 3,000 miles.
- Spark Plugs: Use AC Delco Double Platinum plugs for the best compatibility with the LT1.
- Air Filter: Inspect the “home plate” and “first base” resonators for cracks that could cause vacuum leaks.
- Brake Fluid: Flush every 2 years to prevent moisture buildup in the ABS unit.
For those looking to perform their own diagnostics, remember that 1995 was a transition year for OBD (On-Board Diagnostics). While the car has an OBD-II style 16-pin connector under the dash, the computer often uses OBD-I protocols. You may need a specific ALDL cable and software like ScanMaster to read codes effectively.
Buyer’s Guide: What to Look for in a 1995 Impala SS
If you are in the market for one of these cars, the 1995 chevrolet impala ss specs are your roadmap to a good purchase. First, verify that the car is a true SS and not a Caprice clone. Check the SPID label (usually located on the trunk lid or inside the glove box) for the RPO code “WX3.” If you don’t see WX3, it’s not an original Impala SS.
Check the “C-pillars” for any signs of rust or bubbling, especially near the rear window trim. Also, inspect the lower door skins. These cars were built on a body-on-frame chassis, so while the body might show some wear, the frame should be solid. Bring a flashlight and look for heavy scaling or soft spots near the rear control arm mounts.
Test drive the car and pay attention to the transmission shifts. It should be firm but not jarring. If the transmission “hunts” for gears or slips between 2nd and 3rd, it may be time for a rebuild. These transmissions are widely supported by the aftermarket, so a rebuild is not the end of the world, but it is a significant bargaining chip during the sale.
Frequently Asked Questions About 1995 Chevrolet Impala SS Specs
How fast is a 1995 Impala SS from 0 to 60?
In stock form, the 1995 Impala SS can accelerate from 0 to 60 mph in approximately 7.0 to 7.1 seconds. It can complete the quarter-mile in about 15.4 seconds at 89 mph. While these numbers seem modest by today’s standards, the car’s massive size makes the acceleration feel much more substantial.
What is the fuel tank capacity of the 1995 Impala SS?
The 1995 Impala SS features a 23-gallon fuel tank. Given its EPA rating of roughly 17 mpg city and 25 mpg highway, the car has a respectable cruising range, making it an excellent choice for long-distance road trips.
Can I use regular 87 octane gas in my LT1?
While the LT1 can run on 87 octane due to its knock sensors, it is highly recommended to use 91 or 93 octane premium fuel. The 10.4:1 compression ratio thrives on higher octane, and you will notice better throttle response and slightly better fuel economy with premium gasoline.
Is the 1995 Impala SS a good daily driver?
Absolutely. The 1995 Impala SS offers a massive trunk, seating for five adults, and a relatively comfortable ride. As long as you stay on top of the preventative maintenance, especially the cooling system and Optispark, these cars can easily surpass 200,000 miles.
What are the most common performance mods for this car?
The “Big Three” mods for the Impala SS are a cold air intake, a cat-back exhaust system, and 3.73 rear gears. Adding a custom PCM tune from a specialist can also optimize the shift points and fuel maps, unlocking an extra 15-20 horsepower quite easily.
Final Thoughts on the 1995 Chevrolet Impala SS
The 1995 Chevrolet Impala SS is more than just a spec sheet; it is a piece of American history. It proved that a full-size sedan could be menacing, fast, and practical all at once. By understanding the 1995 chevrolet impala ss specs, you gain the knowledge needed to keep this beast on the prowl for another thirty years.
Whether you are replacing the Optispark in your driveway or scouring the classifieds for a Dark Cherry Metallic gem, remember that these cars reward those who pay attention to the details. Keep your fluids fresh, your tires aired up, and your foot on the gas. Stay safe and enjoy the ride!
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