t/c lock up switch - Ford Powerstroke Diesel Forum
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post #1 of 36 Old 09-24-2007, 01:03 PM Thread Starter
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t/c lock up switch

i just finished my home made lock up switch and wanted to know what speed or rpm i should lock and un lock it. right now it feels like it locks and unlocks around 45 mph but i do have 35in. tires any suggestions

99.5 F-250 4X4 LARIAT
35IN. BFG KM2s
2.5 IN. LEVELING KIT
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TS CHIP (TUNED BY MATT @ GEARHEAD)
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GARRETT 38R TURBO
6.0 INTERCOOLER
4IN. TURBO BACK EXHAUST
CSE FAB SINGLE BLACK 8IN. SLASH CUT STACK
CCV MOD
CSE PRE PUMP KIT
TRANNY COOLER WITH FAN
CSE FAB PORTED EXHAUST FLANGE
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post #2 of 36 Old 09-24-2007, 01:33 PM
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The good kits I have found lock up at 41mph, Just my 2 cents.


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On vacation from a truck for a year or...
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Looking at 6.4s Moving in a few months then hopefully buying my dream truck!!!
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Driving an Audi till then...
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but at work I drive
16 E-450s 7.3 powerstroke Ambulances
7 Duramaxes
1 GMC Kodiak Ambulance

NO CUMMINS.....
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post #3 of 36 Old 09-24-2007, 02:35 PM
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I have mine set to lock at 32 and unlock at 22... Works great for me everyday... Lock it a little sooner on the track...

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #4 of 36 Old 09-24-2007, 02:52 PM Thread Starter
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my switch aint nothin fancy just a toggle you flip on and off. would this cause any damage to the lock up clutch switch on and off

99.5 F-250 4X4 LARIAT
35IN. BFG KM2s
2.5 IN. LEVELING KIT
AEM AIR INTAKE
TS CHIP (TUNED BY MATT @ GEARHEAD)
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GARRETT 38R TURBO
6.0 INTERCOOLER
4IN. TURBO BACK EXHAUST
CSE FAB SINGLE BLACK 8IN. SLASH CUT STACK
CCV MOD
CSE PRE PUMP KIT
TRANNY COOLER WITH FAN
CSE FAB PORTED EXHAUST FLANGE
TIM MOYE TRANSMISSION
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post #5 of 36 Old 09-25-2007, 06:47 AM
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According to my tranny builder the T/C lockup switch is a tranny saver. John wood said if I did not already have a switch he would have put one in my truck when he built the tranny.

Keep Strokin'


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(Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
Bored with current setup
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post #6 of 36 Old 09-25-2007, 06:50 AM
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sorry not trying to hijack....but what is this supposed to help. and when/why do it? i have seen a few threads on it but none say what the benifits are....

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post #7 of 36 Old 09-25-2007, 07:21 AM
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yeah if you guys could explain a little more....I might have a light bulb turn on

-Julian

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4th 6.fo
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post #8 of 36 Old 09-25-2007, 07:34 AM
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ok Cummins,, im curious how did you make a lockout switch? and what did you use?


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'03 F250 Lariat FX 4X4 cc 7.3L gray/black
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post #9 of 36 Old 09-25-2007, 08:18 AM
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The benefit of the switch is to get the Torque Converter Clutch to lockup sooner. The result is much less heat being created in the fluid from the "slipping" of the torque converter.
-Aaron

2000 Ext. Cab F350 SRW, 6" Skyjacker lift on front/8" BDS Springs on rear w/NO blocks, 37x13.50 Nitto Mud Grappler's, Aftermarket Front Bumper

-Always More Stuff Coming!
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post #10 of 36 Old 09-25-2007, 08:30 AM
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Mine is nothing more that a $.50 toggle switch from Radio Shack. One side is connected to the T/C lock up wire. The other, to a ground. When you flip the switch it grounds out and locks the T/C. It took me about 15 minutes to install. The hardest part was figuring out where I wanted the switch.

I use mine mainly for when I am pulling my 5er. Keeping the T/C locked, I can do engine braking. And the tranny doesn't go into coast when you touch the brake.

As for other benifits, you can lock the t/c over 25 mph and do some serious acceleration.

Anything under 25 mph and your engine starts to stall.

Any way's, I wouldn't think of towing with out it again.

Jody in Mesa,Az
97' crew cab xlt, F350
7.3L PSD
Long Bed
2 wheel Drive
3 gauge pillar(egt,boost,trannytemp)
3" down pipe
DP Tuner
CAT Delete.
Tranny Rebuid ( 3 disk TQ, extra clutches, all billet steal internal parts, New HD Valve Body, 45,000 BTU cooler)


37' Avion 5th Wheel
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