Product Description
The TRANSGO SK ALLISON-JR SHIFT KIT is a smart upgrade for 2006-2010 GM 2500HD and 3500HD trucks equipped with the Allison 6-speed automatic transmission. Built for hard-working tow rigs, tuned street trucks, and daily-driven Duramax applications, this valve body repair and correction kit is designed to improve clutch holding power, reduce slip, and help protect the transmission before expensive internal damage happens.
This kit targets common Allison 1000/2000/2400 six-speed complaints including 3-4 slip, neutralizing under load, stuck-in-gear issues, and clutch distress tied to higher torque output. Once installed, it helps increase holding capacity in 2nd through 6th gear and is a strong preventative upgrade for trucks that tow, haul, or run added horsepower.
Key Benefits:
- Helps correct 3-4 slip and neutralizing under load
- Reduces the chance of burnt C2 and C3 friction plates
- Improves clutch and brake holding capacity in 2nd-6th gears
- Supports better durability for towing and tuned applications
- Installs without removing the transmission
- Helps address common Allison transmission trouble codes
Fitment Details:
- 2006-2010 GM Silverado 2500HD/3500HD
- 2006-2010 GMC Sierra 2500HD/3500HD
- For trucks equipped with Allison 1000, 2000, or 2400 6-speed automatic transmission
- Commonly used on LBZ and LMM 6.6L Duramax applications
What’s Included:
- (2) USA-made hardened steel trim valves
- Balls, inner and outer springs
- Drill bit
- Installation instructions
Common Problems This Kit Helps Address:
- Slip 3-4
- Neutralizes under load in 3rd or 4th gear
- Burnt C2 and C3 friction plates
- Stuck in one gear
- Trouble codes P0732, P0733, P0734, P0735, P0766, and P0777
Notes:
- Designed for Allison 6-speed applications with the internal MLP switch
- Shift feel may become more noticeable after installation
- Recommended before adding horsepower to help reduce internal transmission damage
- Excellent option for towing, work trucks, and mild-to-moderate performance builds
Specifications for TRANSGO SK ALLISON-JR
| Specifications for TRANSGO SK ALLISON-JR | |
|---|---|
| Part Number | SK ALLISON-JR |
| Brand | TRANSGO |
| UPC | 810159322416 |
| GTIN | 810159322416 |
| Transmission Fitment | Allison 1000 / 2000 / 2400 6-Speed Automatic |
| Vehicle Fitment | 2006-2010 GM 2500HD/3500HD |
| Shipping Info | Calculated at checkout |
| Prop 65 | Yes - This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. |
No. One of the biggest benefits of this kit is that it can be installed without removing the transmission, making it an efficient upgrade for preventative maintenance and performance support.
What transmission problems can this shift kit help correct?This kit is designed to help reduce 3-4 slip, neutralizing under load, burnt C2/C3 frictions, stuck-in-gear conditions, and certain Allison-related ratio and solenoid codes such as P0732, P0733, P0734, P0735, P0766, and P0777.
Is this a good choice for towing or tuned Duramax trucks?Yes. This kit is well suited for towing, work, and performance-minded trucks because it increases holding capacity and helps support the transmission under higher load conditions.
What Allison transmissions does SK ALLISON-JR fit?It fits Allison 1000, 2000, and 2400 six-speed automatic transmissions used in applicable 2005-2010 GM platforms, with primary diesel truck fitment focused on 2006-2010 2500HD/3500HD applications.
Will this kit make shifts firmer?Shift feel is often more noticeable after installation, especially under load. The main advantage is improved clutch holding power and transmission durability rather than harsh shifting for its own sake.
