CHEVROLET TRUCK BLAZERS10 Automatic Transmission Ctf 400-02789 S10/JIMMY S15 31851452

( Brand: Chevrolet Truck ), ( Manufacturer Part Number: BLAZERS10 ), ( Part Type: Transmission ), ( Conditions Options: 4.3, Clm, 4at, Rwd ), ( Genuine Oem: Yes ), ( Ipn: 400-02789 ), ( Manufacturer Warranty: 6 Month )

Review CHEVROLET TRUCK Automatic Transmission Opt Ctf S10/jimmy S15 fits BLAZER JIMMY S10 2WD 1994

The **Chevrolet 400-02789 Automatic Transmission (CTF 94) for 2WD S10/Blazer/Jimmy (31851452)** is a robust, high-performance powertrain component designed specifically for the iconic 1994 1998 Chevrolet S10, Blazer, and Jimmy pickup trucks and SUVs equipped with the legendary **31851452** engine configuration. This transmission is a **4-speed automatic (4L60-E or 4L60-E1 variant)**, engineered to deliver seamless shifting, enhanced durability, and reliable performance under demanding conditions. Built with a **cast aluminum housing** and reinforced internal components, including a **heavy-duty torque converter** and **precision-machined planetary gears**, this transmission is engineered to handle the torque output of the paired V8 or inline-six engines while maintaining smooth acceleration and efficient fuel economy. The **CTF 94 (Corporate Technical Feature) designation** indicates it meets or exceeds OEM specifications, ensuring compatibility with stock drivetrains and aftermarket modifications alike. Whether used in towing applications, off-road adventures, or daily driving, this transmission is designed to withstand the rigors of heavy loads, high RPMs, and extended use without compromising performance. Its **sealed internal components** and **durable gaskets** minimize fluid leakage, while the **integrated oil pump and valve body** ensure consistent lubrication and optimal hydraulic pressure for smooth shifting. For enthusiasts seeking a reliable, high-quality replacement or upgrade, this transmission offers a perfect blend of OEM precision and aftermarket reliability, making it an ideal choice for restoring or enhancing the drivetrain of a classic Chevrolet S10, Blazer, or Jimmy.

### **Pros and Cons of Buying a Chevrolet 400-02789 Automatic Transmission (2WD, Opt CTF, 94 Blazer/S10/Jimmy S15, VIN 31851452)**

This vehicle appears to be a **1994 Chevrolet S10/Blazer/Jimmy** equipped with the **400-series automatic transmission (02789)** a robust but aging drivetrain. Below is a detailed breakdown of its advantages and disadvantages, followed by a conclusion and recommendation.

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### **Pros**

1. **Proven Durability of the 400 Transmission**

- The **400-series automatic transmission** (also found in full-size Chevys and GMCs) is known for its **reliability and strength**, especially when properly maintained. It is less prone to catastrophic failure compared to some modern transmissions that may suffer from electronic or software issues.

- Many owners report **long-term durability** if the fluid is changed regularly and the transmission is not abused (e.g., excessive towing without proper cooling).

2. **Strong Engine Choice (305 or 350 V8 Options)**

- The **305 V8** (in early '94 models) and **350 V8** (later '94) are **well-built, torquey engines** that can handle heavy loads if modified. The **350 V8** is particularly robust and often used in performance builds.

- These engines are **easy to work on** and have a **large aftermarket support** for upgrades (e.g., performance camshafts, headers, fuel system modifications).

3. **Simple and Affordable Maintenance**

- **Basic repairs** (e.g., fluid changes, valve body adjustments, torque converter swaps) are **cheaper** than modern transmissions with complex solenoids and electronics.

- **Parts are widely available** and often **inexpensive**, especially for the 400 series.

- **No advanced diagnostics** required mechanical issues are easier to diagnose with a scan tool or by feel.

4. **Good for Towing (With Modifications)**

- The **350 V8** (especially with a **performance cam and exhaust**) can tow **moderate loads** (e.g., small trailers, boats) if the transmission is **properly cooled** (aftermarket cooler recommended).

- The **400 transmission** can handle **short-term heavy loads** better than some modern automatics if the fluid is kept clean.

5. **Classic Truck Appeal & Customization Potential**

- The **S10/Blazer/Jimmy** platform is **popular for builds**, whether for **off-roading, street rods, or daily drivers**.

- **Body-on-frame construction** allows for **heavy modifications** (lift kits, suspension upgrades, custom paint) without worrying about warped panels.

- **Vintage styling** appeals to those who prefer a **retro look** over modern trucks.

6. **Lower Initial Cost (Compared to Modern Trucks)**

- Used **1994 S10/Blazer/Jimmys** with the 400 transmission are **significantly cheaper** than newer trucks, making them a **budget-friendly** option for those who want a **larger, more capable vehicle**.

- **Insurance and registration costs** are also lower than for modern trucks.

7. **Off-Road & Utility Strength**

- The **body-on-frame design** and **strong suspension** (when upgraded) make these trucks **better suited for rough terrain** than modern unibody trucks.

- **Stock or lightly modified**, they can handle **light off-roading** (rock crawling, dirt roads) without major issues.

8. **Easy to Find Help & Community Support**

- The **Chevy S10/Blazer/Jimmy community** is **active**, with **forums (e.g., S10.org, BlazerForums), YouTube tutorials, and local clubs** where owners share knowledge.

- **Mechanics familiar with these trucks** are more common than for rare or highly specialized vehicles.

---

### **Cons**

1. **Age-Related Wear & Tear**

- At **28 years old (as of 2024)**, this truck will have **significant mileage** if it s been driven hard. **Rust, worn suspension, and failing electrical components** are common.

- **Rust in the frame, floor pans, and wheel wells** (common in older trucks, especially in snowy/salty climates).

- **Worn bushings, ball joints, and shocks** (expect to replace these within the first year if not already done).

- **Failing alternator, starter, or battery** (12V systems degrade over time).

2. **Transmission Limitations**

- The **400 transmission is not designed for heavy-duty towing** without modifications. **Overheating and fluid breakdown** can lead to **slipping or complete failure** if pushed too hard.

- **No torque converter clutch (TCC)** in stock form later models (1995 ) had an **electronic TCC**, but this one is likely **manual-shift only**, meaning **less fuel efficiency in stop-and-go traffic**.

- **No modern shift quality** the 400 is **not as smooth** as a modern automatic, with **some jerkiness** in gear changes.

3. **Fuel Economy is Poor by Modern Standards**

- The **305 V8** gets **around 12-15 MPG combined**, while the **350 V8** gets **10-13 MPG**.

- **No turbocharging or direct injection** expect **high fuel consumption**, especially if modified for power.

4. **Emissions & Modern Compliance Issues**

- **No OBD-II** (pre-1996 models lack modern emissions diagnostics), which can be a **problem if you need to pass smog checks in strict states**.

- **EPA/California emissions standards** may require **expensive modifications** (e.g., EGR deletions, catalytic converter swaps) to keep the truck legal.

- **Some states ban pre-1975 vehicles**, but this one is **well within legal limits**, though **insurance may be harder to find** for high-mileage or heavily modified trucks.

5. **Safety Concerns**

- **No modern safety features** (no ABS, no airbags in base models, weak or missing seat belts in some cases).

- **Rust can compromise structural integrity**, increasing crash risk.

- **Tire and brake systems** may be **worn out** and in need of replacement.

6. **Reliability Depends Heavily on Maintenance History**

- If the **transmission fluid was never changed**, the **400 will fail prematurely** (expect **$1,500 $3,000 ** for a rebuild).

- **Engine issues** (head gaskets, rod bearings, valve train wear) are **common in high-mileage V8s** if not maintained.

- **No records?** Assume **major components (timing belt, water pump, serpentine belt system) are due for replacement**.

7. **Resale Value is Almost Zero**

- These trucks **lose value fast** and are **not considered "collectible"** unless in **showroom condition**.

- If you plan to sell later, **expect to recoup very little** unless you spend **thousands on restorations**.

8. **Modern Trucks Offer Better Features for Less Money**

- A **used Ford F-150 (2010 ) or Chevy Silverado (2014 )** with **A/T, AWD, modern safety, and better fuel economy** can be found for **similar or lower prices** than a restored '94 S10.

- **No infotainment, no backup camera, no advanced diagnostics** this truck is **very basic by today s standards**.

9. **Parts Availability is Declining**

- While **still available**, **original GM parts for the 400 transmission and 305/350 engines are becoming harder to find** in full sets.

- **Aftermarket parts** (e.g., torque converters, solenoids) are **more expensive** than they used to be.

10. **Not Ideal for Daily Use in Harsh Conditions**

- **Snow, ice, and extreme heat** can **accelerate rust and electrical failures**.

- **No modern suspension tuning** ride quality is **harsh compared to modern trucks**.

---

### **Conclusion**

- **Have mechanical skills** (or access to a good mechanic).

- **Plan to restore it to running condition** (expect **$5,000 $15,000 ** for a full rebuild).

- **Want a strong, customizable truck** for **off-roading, towing light loads, or as a daily driver with modifications**.

- **Are okay with lower fuel economy, poor emissions compliance, and no modern conveniences**.

However, if you **prioritize reliability, safety, fuel

Details:

Engine oil pans must be re-sealed. If heat tabs are melted or removed, warranty void. No Hardware, Accessories. We remove oil pans to inspect automatic transmissions.

Fill with fluid according to manufacturers recommended type and level. Purchaser must replace seals, gaskets, and filter before installation re-seal the oil pan. Small Parcel Shipping UPS/FedEx: Free shipping on all small parcel orders. Contact B R immediately prior to removing or repairing any components.

Transfer Case. Radiators must be flow tested or replaced receipts required. Inspect and replace as needed. Timing belts, thermostat, water pump and other maintenance items must be replaced.

Must be installed and inspected by a factory trained certified technician. Check with the dealer as components may be different. BLAZER S10/JIMMY S15 94 AT; 4x2, w/interim design change opt CTF. Confirm proper gear ratio prior to installation.

B R Automotive does not guarantee mileage. Cooling lines must be flushed of debris before installing. Brakes, seals, sensors, and lines should be inspected replaced as needed. Torque converter must be properly seated and aligned to the front pump.

Inspect and replace seals gaskets as needed. Residential delivery is not included in the free shipping or our regional charges. Warranty does not include shift motor, switches, sensors, or seals. No Labor or any other charges related to the sale installation of this product are warranted.

part #: blazers10 prices

• $16.50-$55.00

specifications autotransmissionsgo:

• for models: S10, 2wd, Blazer, Jimmy
• for makes: Chevrolet
• for years: 1994
• brand: Chevrolet Truck
• mpn: Blazers10
• part type: Transmission
• conditions options: 4.3, Clm, 4at, Rwd
• genuine oem: Yes
• ipn: 400-02789
• manufacturer warranty: 6 Month

offer autotransmissionsgo:

• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: March 12, 2026
• best offers: True

shipping autotransmissionsgo:

• cost: $149.00
• class: Freight
• service: Flat Rate Freight
• type: Fixed

seller autotransmissionsgo:

• rating: 98.3%
• city: Bend, Oregon
• # reviews: 69414

payments autotransmissionsgo:

• other
• credit card: Discover
• wallet: Apple-pay

returns autotransmissionsgo:

• policy: Returns Accepted
• time: 60 Days
• paid by: Buyer

general autotransmissionsgo:

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

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