CADILLAC 24290642 Automatic Transmission Gear Box 24287096 8-SPEED 8L45

( Manufacturer Part Number: 24290642 ), ( Bundle Listing: No ), ( Type: Awd ), ( Fitment Type: Direct Replacement ), ( Ipn: 24287096 ), ( Oe/oem Part Number: 24290639 )

Review CADILLAC 8-speed Automatic Transmission Gear Box Oem fits CT4 AWD 2020–2023

The **Cadillac 24290642 8L45 8-Speed Automatic Transmission Gearbox (2020 2023 CT4 AWD)** is a high-performance, precision-engineered powertrain component designed to deliver seamless shifting, superior efficiency, and robust durability for Cadillac s flagship CT4 All-Wheel Drive model. This advanced transmission is a refined evolution of General Motors **8L45** family, engineered to work in tandem with the CT4 s twin-turbocharged 3.6-liter V6 engine, producing a combined output that maximizes both performance and refinement. The **8-speed automatic** architecture features a **torque converter with lockup clutch**, enabling smoother acceleration and improved fuel economy by minimizing energy loss during gear transitions. Its **wet dual-clutch design** allows for rapid, precise shifts critical for the CT4 s sport-tuned handling and responsive throttle response while the **adaptive shift logic** continuously recalculates optimal gear ratios based on driving conditions, ensuring a balance between power delivery and efficiency.

Under the hood, this transmission is built with **high-strength steel and aluminum components**, reducing weight while maintaining structural integrity, which is particularly advantageous for the CT4 s AWD system, where balanced weight distribution is key. The **8-speed layout** includes a **reverse gear integrated into the planetary cluster**, eliminating the need for a separate reverse idler, thus improving compactness and reliability. The **hydraulic valve body** is meticulously calibrated to optimize shift quality, with **electronic control module (ECM) integration** allowing for real-time adjustments to transmission fluid pressure, shift timing, and torque converter operation. This ensures that whether the driver is navigating city traffic, cruising on the highway, or pushing the CT4 s limits on a twisty road, the transmission adapts effortlessly, providing a near-instantaneous and smooth power delivery experience.

For the **2020 2023 CT4 AWD**, this transmission is specifically tuned to complement the vehicle s **all-wheel-drive system**, which dynamically allocates torque between the front and rear axles via a **viscous coupling** and **electronic torque vectoring**. The **8L45 s robust construction** includes **sealed planetary gears** and **precision-machined shafts**, reducing friction and wear while extending the transmission s lifespan under demanding conditions. The **transmission fluid** typically a **Dexron 6 automatic transmission fluid (ATF)** is formulated to withstand high temperatures and pressures, further enhancing longevity and performance. Additionally, the **integrated torque converter** with its **multi-disc clutch** allows for efficient power transfer, reducing strain on the engine while improving fuel economy in city driving scenarios.

Maintenance and reliability are paramount in this transmission s design, with **built-in diagnostics** that monitor for potential issues such as fluid degradation, clutch wear, or solenoid malfunctions. The **8L45 s modular architecture** also facilitates easier servicing, as components like the **valve body, solenoids, and torque converter** can be replaced without dismantling the entire unit. For enthusiasts and mechanics alike, this transmission represents a blend of **cutting-edge technology and engineering precision**, ensuring that the CT4 AWD delivers not just power, but a **refined, driver-focused experience** with every shift. Whether in standard or performance trim, the **2020 2023 CT4 s 8L45 transmission** is a testament to Cadillac s commitment to blending luxury, performance, and advanced automotive innovation.

### **Pros and Cons of Buying a 2020-2023 Cadillac CT4 AWD (VIN 24290642) with an 8L45 8-Speed Automatic Transmission**

#### **Pros**

1. **Strong Performance and Handling**

The CT4 is a sporty luxury coupe with a turbocharged 2.0L inline-4 engine (275 hp) paired with an 8-speed automatic transmission (8L45). The AWD system enhances traction and stability, making it well-suited for varied road conditions. The 8-speed transmission provides smooth shifts and responsive acceleration, though it may not match the raw power of V8-based luxury sedans.

2. **Luxury and Comfort**

Cadillac s interior features high-quality materials, premium sound systems (often with wireless Apple CarPlay/Android Auto), and ergonomic seating. The CT4 offers a refined, upscale cabin with available features like heated/ventilated seats, ambient lighting, and a quiet ride, making it comfortable for both city and highway driving.

3. **Reliability of the 8L45 Transmission**

The 8L45 is a robust transmission used in many GM vehicles (e.g., Chevrolet Camaro, GMC Sierra). While no transmission is perfect, the 8L45 is generally reliable if properly maintained. Common issues (like delayed shifts or rough engagement) are often fixable with software updates or minor adjustments. However, neglecting maintenance (e.g., fluid changes) can lead to premature wear.

4. **AWD Advantage**

The AWD system provides better grip in wet or snowy conditions compared to FWD models. This is particularly useful if you live in an area with unpredictable weather or enjoy spirited driving.

5. **Resale Value and Brand Appeal**

Cadillac has improved its reputation in recent years, and the CT4 holds its value reasonably well for a luxury coupe. The brand s focus on tech and design may appeal to buyers who prefer a modern, stylish vehicle over traditional luxury brands.

6. **Available Tech and Safety Features**

Many CT4 models come with advanced safety tech like adaptive cruise control, lane-keeping assist, and blind-spot monitoring. The CT4 also supports over-the-air software updates, which can improve performance and features over time.

---

#### **Cons**

1. **Engine Limitations**

The 2.0L turbocharged inline-4 engine is peppy but lacks the torque and power of larger V6 or V8 engines found in competitors like the BMW 4 Series or Audi A5. This can make the CT4 feel underpowered in comparison to more traditional luxury coupes. The AWD system adds weight, further reducing fuel efficiency.

2. **Transmission and Drivetrain Issues**

- **Delayed or rough shifts**, especially under heavy load or when cold.

- **AWD system quirks**, such as the rear differential locking up unexpectedly or the system disengaging abruptly.

- **Front differential noise** (whining or humming) in some models, which may require a repair.

The transmission fluid should be changed every 60,000 100,000 miles to prevent long-term issues.

3. **Build Quality and Durability Concerns**

- **Rust issues** in certain regions (especially if the vehicle was exposed to salt or moisture).

- **Electrical gremlins**, such as intermittent sensor failures or infotainment glitches.

- **Suspension wear**, particularly in the rear subframe or bushings, which can lead to clunking noises over time.

4. **Fuel Economy Trade-Offs**

The AWD configuration reduces fuel efficiency compared to FWD models. The CT4 AWD typically averages around **18 22 MPG city / 26 30 MPG highway**, which is decent but not exceptional for a luxury vehicle.

5. **Limited Practicality**

As a coupe, the CT4 lacks rear legroom and cargo space. The trunk is small (around 10.7 cu. ft.), making it impractical for large purchases or road trips with luggage. The lack of a rear bench also limits passenger comfort for taller individuals.

6. **Market Position and Competition**

The CT4 competes with vehicles like the BMW 4 Series, Audi A5, and Lexus GS, which often offer more power, better resale value, and stronger brand loyalty. Cadillac s market share in the luxury coupe segment is smaller, which can affect long-term reliability perceptions.

7. **Potential Hidden Costs**

- **AWD maintenance**: AWD systems require more frequent inspections and may have higher repair costs than FWD.

- **Software updates**: Cadillac has had a history of recall-related software updates, which may require dealer visits.

- **Parts availability**: While not a major issue, some aftermarket parts for Cadillac may be less common than for more mainstream brands.

---

### **Ending Conclusion**

The **2020 2023 Cadillac CT4 AWD with an 8L45 transmission** is a compelling choice for buyers who prioritize **sporty handling, luxury features, and AWD capability** without the expense of a V8-powered luxury sedan. It offers a **refined driving experience** and modern tech, but its **engine limitations, potential transmission/AWD quirks, and practicality issues** must be carefully considered.

- Drive primarily in the city or on well-maintained roads,

- Value a **luxury coupe with AWD** over a more powerful or spacious alternative,

- Are prepared for **regular maintenance (fluid changes, inspections)** and potential minor repairs,

- Can accept **average fuel economy and limited cargo space**,

then the CT4 AWD could be a **solid purchase**, especially if priced competitively.

- Need **more power, torque, or long-term reliability**,

- Require **better fuel efficiency or more cargo space**,

- Prefer a **brand with stronger resale value** (e.g., BMW, Audi, Lexus),

then you may want to explore alternatives like the **BMW 430i, Audi A5, or Lexus GS**.

---

### **Recommendation**

- You ve **verified its maintenance history** (transmission fluid changes, AWD system checks).

- You re **comfortable with its engine limitations** and have budgeted for potential AWD/transmission repairs.

- You **prioritize driving dynamics and luxury** over raw power or practicality.

- You **expect high-mileage performance** without proactive maintenance.

- You **need a vehicle for daily family use** (consider an SUV or sedan instead).

- You re **uncomfortable with Cadillac s brand reputation** compared to competitors.

**Final Note:** Always **get a pre-purchase inspection** from a trusted mechanic, especially focusing on the **transmission, AWD system, and suspension**. If the vehicle checks out, the CT4 AWD can be a **great choice for an enthusiast-oriented luxury buyer**.

Details:

INTERIOR COLOR/TRIM: VINYL PVC / JET BLACK HXR 4AA 407A. MILEAGE: 37K MILES. BODY TYPE: SEDAN 4-DOOR. TRANSMISSION: 8-SPEED AUTOMATIC 8L45.

part #: 24290642 prices

• $250.00-$2049.99

specifications autotransmissionsgo:

• for models: Ct4, Awd
• for makes: Cadillac
• for years: 2020-2023
• mpn: 24290642
• bundle listing: No
• type: Awd
• fitment type: Direct Replacement
• ipn: 24287096
• oe/oem part number: 24290639

general autotransmissionsgo:

• condition: Used
• Car Truck Parts Accessories > Transmission Drivetrain > Automatic Transmission

seller autotransmissionsgo:

• rating: 99.9%
• city: Kingsley, Michigan
• # reviews: 68417

returns autotransmissionsgo:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

offer autotransmissionsgo:

• best offers: True
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• started: June 8, 2026
• sold: 0

payments autotransmissionsgo:

• credit card: Diners-club
• wallet: Paypal
• other

shipping autotransmissionsgo:

• service: Economy
• cost: $350.00
• type: Fixed
• class: Economy
• transit: 3-9 Days

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