4R100 TC Lockup Mod Opinions?

[CHPMustang]

A friend of mine passed this mod to me asking if I was familiar with it and if it'd be safe for the basic stock 4R100.

Any ya'll heard of this mod as it's a newbie to me.

Manual switch to lock the torque converter
On the passenger side of the transmission is a connector with 12 pins in an oval body (#C104, the lead from this connector is routed over the trans to the control module. Pin #4 has a purple wire with a yellow strips on it, this is the signal wire from the control module telling the torque converter to lock. Run a jumper from this wire to a switch in the cab, connect the other side of the switch to ground. When the switch is flipped, pin #4 will be grounded and the torque converter will lock up.

 

[Dieselpwrdredneck]

i have heard of it but never did it, i will also be interested to see if is that easy and how good it works

Neal

 

[twildman]

Yes it works, have the same thing done to my truck. Won't hurt anything, just have to remember to unlock it when your coming to a stop or you'll kill the truck.

 

[powerboatr]

Yes it works, have the same thing done to my truck. Won't hurt anything, just have to remember to unlock it when your coming to a stop or you'll kill the truck.

yep
i had heard a soul had also pulled a signal from the vss to unlock or disable the lock up at speeds somehwere round 35 using a few relays and a basic logic module, but then its been a while for the old brain to remember the details,

 

[Tbar]

I have run the t/c lock up mod for 170,000 miles........so far so good.


Tbar

 

[CHPMustang]

Is there a specific transmission gear that the TC lockup mod works best and when to use it?

Recommended to upgrade the TC to something better than stock?

 

[CSIPSD]

Nope, lock her up... I do at about 22 or so and unlock at about 20... Keeps the temps down on the tranny...

 

[forddeerediesel]

what is the whole consept of manual tc lock-up. I do a lot of hauling, could I benefit from this?

 

[CSIPSD]

Yes, any time the TC is locked 100% of the power is going to the rear wheels, not lost in the tranny... Your tranny will run cooler, your clutches will last longer...

 

[Tbar]

Nope, lock her up... I do at about 22 or so and unlock at about 20... Keeps the temps down on the tranny...

Same here.

I believe the T/C engages at 38mph on the stock tranny programing. I can't stand listening to the engine revving until it locks. Less slush box action means less tranny temp heat. Also with OD button disengaged and the t/c locked I use the brakes less around town.

You can buy progaming now that will do this for you automatically as this is a very manual approach.


Tbar