Fits: 2001 thru 2016 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY/LBZ/LMM/LML Duramax Diesel Control your torque converter from the palm of your hand with the AlliLocker™ from Fleece Performance Engineering. The AlliLocker™ is 100% code free* when used on the track 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. Operations State Function Bypass Switch LED OFF (disengaged) TCC Operation Controlled by the TCM LED ON (engaged) TCC Operation Controlled by the Lock Switch Lock Switch Latched (Down) When Bypass LED is illuminated, TCC is commanded to lock Unlatched (Up) When Bypass LED is illuminated, TCC is commanded to NOT lock Operation Explained The Allilocker™ operation is simple. Leave it in normal mode until you want control of the torque converter clutch (TCC). When you engage bypass mode (left rocker switch) the TCC is completely controlled by the pushbutton on the right (it is a latching pushbutton). If you press it down it locks the TCC and stays locked until you push it again which raises the switch back to the open/unlocked position. Features: Simple control over torque converter Includes: Fleece AlliLocker Notes: This product is intended for closed course race use only. Do NOT use on public roadways. Always disengage the bypass switch and unlatch the lock switch when not in use. The AlliLocker is NOT desinged to be used on public roadways. If used on public roadways, the AlliLocker may set a DTC causing a range shift inhibit. This can typically be cleared by a key cycle. When used on the sled pull or drag race track, where there is only one lock event, the AlliLocker will not cause a range shift inhibit. This is for use with automatic Allison 1000 transmissions only. Install Instructions - 2001-2005 LB7/LLY Install Instructions - 2006-2016 LBZ/LMM/LML
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