prob. with TC lockup switch - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 02-19-2007, 10:34 PM Thread Starter
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prob. with TC lockup switch

OK, so I installed a t/c lockup switch a couple of days ago and it isn't working like it should. If I am sitting with the truck in drive and flip the switch the t/c will lock in first gear and stall the truck. I thought it would only lock when the truck shifted to second. The t/c locks and unlocks with the switch just fine. It is just that it will do it in first gear. Any ideas?

2007 F350 CC 4x4, EGR delete, stock for now

Old truck :"01" Dodge 3500 DRW. Goerend Bros w/ triple disk, Edge Drag Comp, Jammer Stage 5's, Turnbuckle, Dakota Digital and ISSPRO Gauges, BHAF,4" FLO-PRO exhaust, Vulcan kit, Holley Blue Pump, TC Lockup Switch, Snow stage 2, a few more little bits in the works

377hp and 823tq @ Smokin' (with stage 3's/no drag upgrade)
"400" club wannabe
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post #2 of 6 (permalink) Old 02-19-2007, 11:49 PM
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I was under the impression that those TC switches would lock them in any gear and that one of the downsides to having one was if you had to stab the brakes real quick to stop it could cause you problems.
post #3 of 6 (permalink) Old 02-20-2007, 01:27 AM
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I know on the fords that it will lock in any gear. It works with a grounding signal. So it does not matter what gear it is in. You can have the truck in park and flip the switch and hear the converter lock up.

Kyle
Early 99 F-250SD 7.3 PSD 4x4. Auto, tymar type intake, straight pipe, Six inch stacks, Tony Wildman Four position chip, Street race, 80 Tow, 80 Econo, Extreme. Let the smoke roll. Upgraded torque converter. Autometer Ultralights on the Pillar. Running Cooper Discover STT's.
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post #4 of 6 (permalink) Old 02-20-2007, 04:59 AM
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did you jump the relay, or leave it in? Not sure what difference that will make, but I'm sure it would do something.
sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

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post #5 of 6 (permalink) Old 02-20-2007, 10:57 AM Thread Starter
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I jumped the relay. I was just under the impression that as long as I switched it on while in 1st gear the tc wouldn't lock until it shifted to second but then wouldn't unlock until I flipped the switch off. I have read that in a couple different places. If that isn't the case that is fine. I just want to make sure it is right.

2007 F350 CC 4x4, EGR delete, stock for now

Old truck :"01" Dodge 3500 DRW. Goerend Bros w/ triple disk, Edge Drag Comp, Jammer Stage 5's, Turnbuckle, Dakota Digital and ISSPRO Gauges, BHAF,4" FLO-PRO exhaust, Vulcan kit, Holley Blue Pump, TC Lockup Switch, Snow stage 2, a few more little bits in the works

377hp and 823tq @ Smokin' (with stage 3's/no drag upgrade)
"400" club wannabe
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post #6 of 6 (permalink) Old 02-20-2007, 06:12 PM
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Thats what I thought as well. The stock torque converter clutch isn't supposed to be able to lock up until you hit 18mph. You have one of Dave's converters in there though, maybe there is something different about that. I believe the DTT's do the same things, and that suncoast converters you can ground out in 1st and it won't lock up until 18mph or 2nd. Maybe call Dave Goerend and see what he says.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
www.totalperformancediesel.com
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