GMC TRUCK SIERRA150 Transmission 242.GM9M99

( Brand: Gmc Truck ), ( Manufacturer Part Number: SIERRA150 ), ( Part Type: Transmission ), ( Conditions Options: 4wd ), ( Genuine Oem: Yes ), ( Ipn: 242.gm9m99 ), ( Manufacturer Warranty: No Warranty )

Review GMC TRUCK Transmission Shift fits 1999

The GMC Sierra 1500, manufactured in 1999, is a full-size pickup truck known for its durability and reliability. One of its essential components is the transmission system, specifically the 4L60-E 4-speed automatic transmission, identified by the part number 242.Gm9m99.

This transmission is a robust and efficient powertrain component that delivers smooth shifts and reliable performance. Its four forward gears enable optimal acceleration and excellent fuel economy. The 4L60-E transmission is designed to handle the torque demands of the Sierra 1500's engine, ensuring a balanced and responsive driving experience.

The 242.Gm9m99 transmission features a hydraulic system that utilizes an electric pump to provide pressure for gear shifts. This design offers quick response times and reduced drag, contributing to the truck's overall performance. Additionally, it comes equipped with a torque converter that ensures seamless power transfer from the engine to the transmission during stop-and-go driving conditions.

The 4L60-E transmission is also built to last, with a heavy-duty construction that can withstand the rigors of daily driving. Its robust design includes a cast iron housing, which provides excellent protection against wear and tear. Furthermore, it boasts a tough planetary gear set and durable synchronizers, ensuring smooth and consistent gear changes even under heavy load.

In the event of a transmission issue, the 242.Gm9m99 transmission is backed by a strong aftermarket support system. Numerous aftermarket companies offer rebuilt and remanufactured transmissions, ensuring that Sierra 1500 owners can find a suitable solution for their vehicle. These transmissions undergo a rigorous rebuilding process, using only high-quality components and updated technology to restore the transmission to its original performance levels.

In summary, the 242.Gm9m99 transmission in the GMC Sierra 1500 (1999 model) is a dependable and robust powertrain component. Its smooth shifts, fuel efficiency, and ability to handle the engine's torque make it an essential part of this iconic pickup truck. Additionally, its heavy-duty construction and strong aftermarket support ensure that it can continue to perform at its best for years to come.

1. Cost-effective: Compared to a new transmission or even a rebuilt one, a used transmission can be a more affordable option for vehicle owners.

2. Readily available: Used transmissions can be easily found in the aftermarket, making it a convenient choice for those in need of a replacement.

3. Good condition: If the used transmission has been well-maintained and inspected by a trusted mechanic, it can function as good as new.

1. Unknown history: The previous usage and maintenance history of the transmission are unknown, which could lead to potential issues down the line.

2. Compatibility: There's a risk that the used transmission might not be compatible with the rest of the vehicle, leading to additional repair costs.

3. Quality concerns: The used transmission might not be of the best quality, leading to potential performance issues or the need for frequent repairs.

Buying a used 1999 GMC Sierra 150 2.42GM9M99 transmission can be a cost-effective solution, but it comes with its own set of risks. To mitigate these risks, it's essential to ensure that the transmission has been well-maintained, inspected by a trusted mechanic, and is compatible with your vehicle. If you're confident in the source of the used transmission and the associated risks are acceptable to you, then it could be a viable option. Otherwise, it might be worth considering a new or rebuilt transmission.

1. Verify compatibility: Ensure that the used transmission is compatible with your vehicle by checking the vehicle identification number (VIN) and the transmission part number.

2. Inspect the transmission: Have a trusted mechanic inspect the transmission before purchasing it to assess its condition and identify any potential issues.

3. Research the seller: Research the seller's reputation and reviews to ensure that they are a reputable source for used transmissions.

4. Consider a warranty: If possible, consider purchasing a warranty for the used transmission to protect against any potential issues.

5. Budget for potential repairs: Be prepared for the possibility of additional repairs or maintenance costs associated with the used transmission.

Details:

It will not come with the shiftier cable or surround trim. Mounting bolts are not included. Please see photos and utilize the zoom tool to check condition of part.

part #: sierra150 prices

• $50.00-$107.93

specifications geashif:

• for makes: Gmc
• for years: 1999
• brand: Gmc Truck
• mpn: Sierra150
• part type: Transmission
• conditions options: 4wd
• genuine oem: Yes
• ipn: 242.gm9m99
• manufacturer warranty: No Warranty

returns geashif:

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

seller geashif:

• city: Buffalo, Wyoming
• # reviews: 5870
• rating: 97.3%

payments geashif:

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

general geashif:

• condition: Used
• Car Truck Parts Accessories > Transmission Drivetrain > Shifters, Cables Linkages

offer geashif:

• sold: 0
• options: Ship-to-home
• started: April 25, 2026
• availability: In Stock
• best offers: True
• quantity: 1

shipping geashif:

• transit: 5-11 Days
• type: Fixed
• cost: $0.00
• class: Standard
• carrier: UPS
• service: UPS Ground

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