{"title":"Switches, Solenoids and Actuators","description":null,"products":[{"product_id":"allison-a-trim-solenoid-lb7-lly-01-05-29533074","title":"ALLISON A TRIM SOLENOID LB7\/LLY 01-05","description":"\u003cp\u003e\u003c\/p\u003e\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eAllison A-Trim Pressure Control Solenoid\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cp\u003e\u003cstrong\u003ePart Number: 29533074\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cp\u003e\r\nThe Allison A-Trim Pressure Control Solenoid (29533074) is an OE-style replacement solenoid designed for 2001–2005 GM Duramax trucks equipped with Allison automatic transmissions. This solenoid installs in the valve body and plays a key role in regulating hydraulic pressure used for clutch apply control, helping the transmission maintain smooth, consistent shift quality under varying load conditions.\r\n\u003c\/p\u003e\r\n\r\n\u003cp\u003e\r\nAs solenoids age, internal wear and electrical issues can cause pressure control problems that show up as harsh shifts, delayed engagement, shift flare, or inconsistent shift feel. Replacing a weak or failing A-Trim solenoid helps restore proper hydraulic control and dependable drivability, especially during towing and daily-use situations where stable pressure control matters most.\r\n\u003c\/p\u003e\r\n\r\n\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eKey Features and Benefits\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cul\u003e\r\n  \u003cli\u003eOE-style replacement for Allison A-Trim pressure control function\u003c\/li\u003e\r\n  \u003cli\u003eHelps restore proper clutch apply pressure and shift consistency\u003c\/li\u003e\r\n  \u003cli\u003eDesigned to improve drivability by correcting pressure-related shift concerns\u003c\/li\u003e\r\n  \u003cli\u003eDirect-fit valve body solenoid for service or rebuild work\u003c\/li\u003e\r\n  \u003cli\u003eIdeal for preventative replacement during valve body service\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eCommon Symptoms of a Weak or Failed A-Trim Solenoid\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cul\u003e\r\n  \u003cli\u003eHarsh or erratic shifting\u003c\/li\u003e\r\n  \u003cli\u003eDelayed engagement into gear\u003c\/li\u003e\r\n  \u003cli\u003eShift flare or inconsistent shift timing\u003c\/li\u003e\r\n  \u003cli\u003ePressure control related drivability issues\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eApplications\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cul\u003e\r\n  \u003cli\u003e2001–2004 Chevrolet Silverado 2500HD 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2001–2004 Chevrolet Silverado 3500 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2001–2004 GMC Sierra 2500HD 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2001–2004 GMC Sierra 3500 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 Chevrolet Silverado 2500HD 6.6L Duramax LLY\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 Chevrolet Silverado 3500 6.6L Duramax LLY\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 GMC Sierra 2500HD 6.6L Duramax LLY\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 GMC Sierra 3500 6.6L Duramax LLY\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cp\u003e\r\nFitment notes: Verify transmission model and valve body configuration before ordering. This is intended for Allison-equipped LB7 and LLY Duramax applications within the model years listed.\r\n\u003c\/p\u003e","brand":"SunCoast Converters","offers":[{"title":"Default Title","offer_id":57273834373493,"sku":"29533074","price":585.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/7656\/2037\/files\/F198660901.jpg?v=1780954151"},{"product_id":"allison-b-trim-solenoid-lb7-lly-01-05-29533075","title":"ALLISON B TRIM SOLENOID LB7\/LLY 01-05","description":"\u003cp\u003e\u003c\/p\u003e\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eAllison B-Trim Pressure Control Solenoid\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cp\u003e\u003cstrong\u003ePart Number: 29533075\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cp\u003e\r\nThe 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.\r\n\u003c\/p\u003e\r\n\r\n\u003cp\u003e\r\nWhile 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.\r\n\u003c\/p\u003e\r\n\r\n\u003cp\u003e\r\nA 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.\r\n\u003c\/p\u003e\r\n\r\n\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eKey Features and Benefits\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cul\u003e\r\n  \u003cli\u003eOE-style replacement for Allison B-Trim pressure control function\u003c\/li\u003e\r\n  \u003cli\u003eFine-tunes clutch apply rates for smoother, more controlled shifts\u003c\/li\u003e\r\n  \u003cli\u003eHelps reduce shift flare and erratic shift timing\u003c\/li\u003e\r\n  \u003cli\u003eImproves overall shift consistency and drivability\u003c\/li\u003e\r\n  \u003cli\u003eDirect-fit valve body solenoid for service or rebuild work\u003c\/li\u003e\r\n  \u003cli\u003eRecommended replacement during valve body service or high-mileage repairs\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eCommon Symptoms of a Weak or Failed B-Trim Solenoid\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cul\u003e\r\n  \u003cli\u003eShift flare during upshifts\u003c\/li\u003e\r\n  \u003cli\u003eInconsistent or erratic shift timing\u003c\/li\u003e\r\n  \u003cli\u003eHarsh shifts not corrected by line pressure adjustments\u003c\/li\u003e\r\n  \u003cli\u003eGeneral drivability complaints related to shift quality\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch4\u003e\u003cspan style=\"color: #ff6600;\"\u003eApplications\u003c\/span\u003e\u003c\/h4\u003e\r\n\u003cul\u003e\r\n  \u003cli\u003e2001–2004 Chevrolet Silverado 2500HD 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2001–2004 Chevrolet Silverado 3500 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2001–2004 GMC Sierra 2500HD 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2001–2004 GMC Sierra 3500 6.6L Duramax LB7\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 Chevrolet Silverado 2500HD 6.6L Duramax LLY\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 Chevrolet Silverado 3500 6.6L Duramax LLY\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 GMC Sierra 2500HD 6.6L Duramax LLY\u003c\/li\u003e\r\n  \u003cli\u003e2004.5–2005 GMC Sierra 3500 6.6L Duramax LLY\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cp\u003e\r\nFitment 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.\r\n\u003c\/p\u003e","brand":"SunCoast Converters","offers":[{"title":"Default Title","offer_id":57273843253621,"sku":"29533075","price":585.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/7656\/2037\/files\/F198660904.jpg?v=1780954152"},{"product_id":"allison-f-trim-tcc-solenoid-8683187","title":"Allison F Trim TCC Solenoid","description":"\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAllison Torque Converter Clutch PWM Solenoid\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eThis is the Allison F trim Solenoid for Allison transmissions. This solenoid fits 2001-2005 Allison 5 speed transmissions. This is a new OE Solenoid.\u003c\/p\u003e","brand":"SunCoast Converters","offers":[{"title":"Default Title","offer_id":57273844466037,"sku":"8683187","price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/7656\/2037\/files\/F198642775_50d06504-e0f5-484a-9877-f0c0d5e13376.jpg?v=1780953787"},{"product_id":"fleece-performance-2001-2002-gm-allison-tapshifter-fpe-tapshifter12","title":"Fleece Performance - 2001-2002 GM\/Allison TapShifter - FPE-TAPSHIFTER12","description":"\u003cp\u003eThe Fleece Performance TapShifter allows you to shift your 2001-2005 GM Allison Transmission with the touch of a button just like the 2006 and newer trucks. Perfect for towing, drag racing, daily driving and everything in-between, the TapShifter installs in no time and provides factory-like operation, functionality and styling. The TapShifter can be used in the gas or diesel 2001-2005 trucks with an Allison Transmission. Installation: The TapShifter installs using OEM high quality connectors for a completely plug and play installation in less than 30 minutes. Operation: TapShifter Operation is very straight forward. To downshift depress the \"-\" button on the shifter. To upshift press the \"+\" button. The TapShifter will allow you to select a range with the shift lever and then tap up and down without worry of tapping to a higher range than selected. This feature is great for sled pullers who do not want to shift to 4th gear on the track! Features: Easy Plug \u0026amp; Play Installation Limits Up-Shifts Overdrive Disable Command Downshifts Decrease Gear Hunting NOTE: 01-02 models will require TCM Re-Flash to enable overdrive lock-out and proper function. \u003ciframe width=\"560\" height=\"315\" src=\"\/\/www.youtube.com\/embed\/7XrzBkN4-y4\" frameborder=\"0\" allow fullscreen\u003e\u003c\/iframe\u003e \u003ciframe width=\"560\" height=\"315\" src=\"\/\/www.youtube.com\/embed\/60V1qTlIqgE\" frameborder=\"0\" allow fullscreen\u003e\u003c\/iframe\u003e \u003ciframe width=\"560\" height=\"315\" src=\"\/\/www.youtube.com\/embed\/_AY7slcZdeA\" frameborder=\"0\" allow fullscreen\u003e\u003c\/iframe\u003e\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":57281304232309,"sku":"FPE-TAPSHIFTER12","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/7656\/2037\/files\/FPE-TAPSHIFTER12_6.jpg?v=1781168015"},{"product_id":"fleece-performance-2001-2016-allilocker-allison-torque-converter-controller-fpe-alilkr","title":"Fleece Performance - 2001-2016 AlliLocker - Allison Torque Converter Controller - FPE-ALILKR","description":"\u003cp\u003eControl your torque converter from the palm of your hand with the AlliLocker(tm) from Fleece Performance Engineering. The AlliLocker(tm) is 100% code free and allows you to bypass the TCM to lock\/unlock the torque converter on demand. Turn the bypass switch off, and the TCM regains control of the torque converter clutch. WARNING: This product is intended for closed course race use only. Do NOT use on public roadways. WARNING: Always disengage the bypass switch and unlatch the lock switch when not in use.\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":57281305575797,"sku":"FPE-ALILKR","price":179.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/7656\/2037\/files\/FPE-ALILKR-F1.png?v=1781168021"},{"product_id":"fleece-performance-2003-2005-gm-allison-tapshifter-fpe-tapshifter35","title":"Fleece Performance - 2003-2005 GM\/Allison TapShifter - FPE-TAPSHIFTER35","description":"\u003cp\u003eThe Fleece Performance TapShifter allows you to shift your 2001-2005 GM Allison Transmission with the touch of a button just like the 2006 and newer trucks. Perfect for towing, drag racing, daily driving and everything in-between, the TapShifter installs in no time and provides factory-like operation, functionality and styling. The TapShifter can be used in the gas or diesel 2001-2005 trucks with an Allison Transmission. Installation: The TapShifter installs using OEM high quality connectors for a completely plug and play installation in less than 30 minutes. Operation: TapShifter Operation is very straight forward. To downshift depress the \"-\" button on the shifter. To upshift press the \"+\" button. The TapShifter will allow you to select a range with the shift lever and then tap up and down without worry of tapping to a higher range than selected. This feature is great for sled pullers who do not want to shift to 4th gear on the track! Features: Easy Plug \u0026amp; Play Installation Limits Up-Shifts Overdrive Disable Command Downshifts Decrease Gear Hunting NOTE: 01-02 models will require TCM Re-Flash to enable overdrive lock-out and proper function. \u003ciframe width=\"560\" height=\"315\" src=\"\/\/www.youtube.com\/embed\/7XrzBkN4-y4\" frameborder=\"0\" allow fullscreen\u003e\u003c\/iframe\u003e \u003ciframe width=\"560\" height=\"315\" src=\"\/\/www.youtube.com\/embed\/60V1qTlIqgE\" frameborder=\"0\" allow fullscreen\u003e\u003c\/iframe\u003e \u003ciframe width=\"560\" height=\"315\" src=\"\/\/www.youtube.com\/embed\/_AY7slcZdeA\" frameborder=\"0\" allow fullscreen\u003e\u003c\/iframe\u003e\u003c\/p\u003e","brand":"Fleece Performance","offers":[{"title":"Default Title","offer_id":57281309213045,"sku":"FPE-TAPSHIFTER35","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/7656\/2037\/files\/FPE-TAPSHIFTER35_6.jpg?v=1781168048"}],"url":"https:\/\/wickeddieselva.com\/collections\/duramax-2001-2004-6-6l-lb7-transmission-switches-solenoids-and-actuators.oembed","provider":"Wicked Diesel VA","version":"1.0","type":"link"}