Horse Power JUNKIE
Join Date: Jul 2008
Location: Santa Cruz, CA & Darby, MT
Thanked 61 Times in 50 Posts
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You have a lock-up style torque converter, at a certian speed it will lock up and provide direct power just like a clutch in a manual truck. The factory setting is any where between 35-45 depending on what gears you have. The shifting pattern is 1st 2nd 3rd... than lock up and then 4th. You can get aftermarket controllers to adjust the speed at which you get lock up to any speed from 18mph up.
The lock up or "mystery" switch is just a switch to ground the tq circuit to achive lock up. But in 99 or 2000 and newer it will set off a check engine light. You have to pay attention though with a switch like that cuase the trany will NOT down shift with tq locked. Also if you try to come to a stop it will kill the motor just like a manual truck not pushing in the clutch.
Send me your email and I can send you instruction on how to wire one up with out the CEL coming on.
2001 2500 4x4
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, DDP 150, TST Comp/Smarty, S&B Intake, PSC brace, Hamilton 110 springs, Fluidamper, ARP studs, 4" straight pipe, AIRDOG 150, BD black FP, Suncoast billet trans, 3-disc converter, 3rd Gen Brakes, Thuren 3rd Gen track bar. RIP grandpa "Red" 10-11-08