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SKU:29533075
Suncoast ALLISON B TRIM SOLENOID LB7/LLY 01-05
Suncoast ALLISON B TRIM SOLENOID LB7/LLY 01-05
Description
Allison B-Trim Pressure Control Solenoid
Part Number: 29533075
The Allison B-Trim Pressure Control Solenoid (29533075) is an OE-style replacement solenoid designed for 2001–2005 GM Duramax LB7 and LLY trucks equipped with Allison automatic transmissions. The B-Trim solenoid installs in the valve body and works in conjunction with the A-Trim solenoid to refine and smooth hydraulic pressure application during shifts.
While the A-Trim solenoid manages primary pressure, the B-Trim solenoid is responsible for fine-tuning clutch apply rates and shift timing. Proper B-Trim function helps control how quickly and smoothly clutches apply, reducing shift flare, harsh transitions, and erratic shift behavior under changing load conditions.
A worn or failing B-Trim solenoid can cause inconsistent shift timing, flare during gear changes, or harsh shifts even when overall line pressure appears normal. Replacing the B-Trim solenoid restores precise pressure modulation, improving drivability and ensuring predictable, repeatable shift quality during daily driving, towing, and higher-mileage operation.
Key Features and Benefits
- OE-style replacement for Allison B-Trim pressure control function
- Fine-tunes clutch apply rates for smoother, more controlled shifts
- Helps reduce shift flare and erratic shift timing
- Improves overall shift consistency and drivability
- Direct-fit valve body solenoid for service or rebuild work
- Recommended replacement during valve body service or high-mileage repairs
Common Symptoms of a Weak or Failed B-Trim Solenoid
- Shift flare during upshifts
- Inconsistent or erratic shift timing
- Harsh shifts not corrected by line pressure adjustments
- General drivability complaints related to shift quality
Applications
- 2001–2004 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2001–2004 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2001–2004 GMC Sierra 2500HD 6.6L Duramax LB7
- 2001–2004 GMC Sierra 3500 6.6L Duramax LB7
- 2004.5–2005 Chevrolet Silverado 2500HD 6.6L Duramax LLY
- 2004.5–2005 Chevrolet Silverado 3500 6.6L Duramax LLY
- 2004.5–2005 GMC Sierra 2500HD 6.6L Duramax LLY
- 2004.5–2005 GMC Sierra 3500 6.6L Duramax LLY
Fitment note: Proper operation of the B-Trim solenoid is critical for smooth clutch apply and shift refinement. For best results during valve body service, A-Trim and B-Trim solenoids are often replaced together.
Fitments
2005 Chevrolet Silverado 2500 HD
2005 Chevrolet Silverado 3500 HD
2005 GMC Sierra 2500 HD
2005 GMC Sierra 3500 HD
2004 Chevrolet Silverado 2500 HD
2004 Chevrolet Silverado 3500 HD
2004 GMC Sierra 2500 HD
2004 GMC Sierra 3500 HD
2003 Chevrolet Silverado 2500 HD
2003 Chevrolet Silverado 3500 HD
2003 GMC Sierra 2500 HD
2003 GMC Sierra 3500 HD
2002 Chevrolet Silverado 2500 HD
2002 Chevrolet Silverado 3500 HD
2002 GMC Sierra 2500 HD
2002 GMC Sierra 3500 HD
2001 Chevrolet Silverado 2500 HD
2001 Chevrolet Silverado 3500 HD
2001 GMC Sierra 2500 HD
2001 GMC Sierra 3500 HD
Instructions
Specifications
SKU: 29533075
GTIN: 840385607698
Manufacture Name: Suncoast Performance
Shipping Weight: 5 lb
Shipping Length: 5 in
Shipping Width: 8 in
Shipping Height: 3.25 in
EO Number:
Cross Reference #
Warranty
California Proposition 65 Warning
California Proposition 65 Warning - P65warnings.ca.gov
29533075
Suncoast ALLISON B TRIM SOLENOID LB7/LLY 01-05
Allison B-Trim Pressure Control Solenoid
Part Number: 29533075
The Allison B-Trim Pressure Control Solenoid (29533075) is an OE-style replacement solenoid designed for 2001–2005 GM Duramax LB7 and LLY trucks equipped with Allison automatic transmissions. The B-Trim solenoid installs in the valve body and works in conjunction with the A-Trim solenoid to refine and smooth hydraulic pressure application during shifts.
While the A-Trim solenoid manages primary pressure, the B-Trim solenoid is responsible for fine-tuning clutch apply rates and shift timing. Proper B-Trim function helps control how quickly and smoothly clutches apply, reducing shift flare, harsh transitions, and erratic shift behavior under changing load conditions.
A worn or failing B-Trim solenoid can cause inconsistent shift timing, flare during gear changes, or harsh shifts even when overall line pressure appears normal. Replacing the B-Trim solenoid restores precise pressure modulation, improving drivability and ensuring predictable, repeatable shift quality during daily driving, towing, and higher-mileage operation.
Key Features and Benefits
- OE-style replacement for Allison B-Trim pressure control function
- Fine-tunes clutch apply rates for smoother, more controlled shifts
- Helps reduce shift flare and erratic shift timing
- Improves overall shift consistency and drivability
- Direct-fit valve body solenoid for service or rebuild work
- Recommended replacement during valve body service or high-mileage repairs
Common Symptoms of a Weak or Failed B-Trim Solenoid
- Shift flare during upshifts
- Inconsistent or erratic shift timing
- Harsh shifts not corrected by line pressure adjustments
- General drivability complaints related to shift quality
Applications
- 2001–2004 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2001–2004 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2001–2004 GMC Sierra 2500HD 6.6L Duramax LB7
- 2001–2004 GMC Sierra 3500 6.6L Duramax LB7
- 2004.5–2005 Chevrolet Silverado 2500HD 6.6L Duramax LLY
- 2004.5–2005 Chevrolet Silverado 3500 6.6L Duramax LLY
- 2004.5–2005 GMC Sierra 2500HD 6.6L Duramax LLY
- 2004.5–2005 GMC Sierra 3500 6.6L Duramax LLY
Fitment note: Proper operation of the B-Trim solenoid is critical for smooth clutch apply and shift refinement. For best results during valve body service, A-Trim and B-Trim solenoids are often replaced together.
Suncoast ALLISON B TRIM SOLENOID LB7/LLY 01-05