GMCDT,
How much did the switch cost through PacBrake? I've been looking for similar switches on ebay but haven't found many set up for 12volts.

Thanks
Ben

 

Cquested, interesting! Maybe I am not activating the switch correctly. So, do you need to physically have the shift lever in 1 or 2 to activate the switch? I was starting out in drive, let it get up to 15-20 and then turned on, is this a no no?

 

No...it locked the converter...it is just what the tranny does afterward. Did you throw any check lights? Then it is wired ok. You must be "manually" in the highest gear you want your truck to be in when you hit the switch or WOT in a drag race situation or it will shift up locked and lug.

Drive 45 in 4th....before the OEM lock signal at 55...and hit the switch...it will lock the converter. Drive 35 in 3rd...hit the switch...and it will lock the converter. Try it at 25 in second...

You will figure it out then.

 

Thanks for the info, I guess it is a bit of learning also how these trannys work. No, I did not get a check light. So like you said above, put it in drive get up to 45 in 4th and hit the switch and so on as you explained, But I can do it while in drive, just not idle, correct?

 

yep...make sure you are moving...and turn the switch off before stopping. The converter will lock when in 1-4 whether you are moving or not and stall the engine if stopped.

 

Sweeeeeeeeeet! It is just nice finding things to do to improve driveability during certain conditions whether racing, towing, etc. These motors are way de-tuned and are capable of alot more. Thankfully the aftermarket performance parts and electronics allows us to tune our trucks for whatever situation!

Thanks for the help!

 

I did this mod today, and I think I'm taking it off. Here's why:
1. Potential tranny damage from shifting while locked (I knew this going in)
2. Seems redundant after what I learned today. We all know that the TC will lock in overdrive above approx 45 mph. What I didn't know (but learned today) is that this tranny will lock in 3rd if overdrive is turned off, and will lock in 2nd if the column shifter is put in the "2" position.

 

Those of you that have tried it, how much time did you drop in the quarter mile?

 

Your a smart man,a lockup switch and a stock trans isnt a good combination.The stock programming is go good on the newer trucks,you arent gaining anything anyway,exc at times when you can hurt the trans.You really need a high quality TC to fix the loose tc fluid coupling.

 

I've got to disagree on this one.
I love my little switch, and on a stock 06....
For my application, I only use it at that 42-50 mph cruising speed where my stock set up won't lock up. I have no interest in quarter mile times or locking it up in lower gears and letting the poor thing bang through the gears.

It's such a relief to flip that sucker on and see the rpms drop, trans temp drop, and mpg increase.
I'm making a special mount for it on the shifter that I'll share later.

chuck

 

Has anyone checked the voltage of the wire that we are grounding?

I assume it's 12v right? (or maybe 14v with the engine running?)
Or could it be less because it's just a signal wire?

I'm trying to figure what the series resistor should be for a "Blue" LED.
If the source voltage is 12v, then about a 400ohm resistor will do the trick.




MT

 

Yeah, that's my thing too. Especially now with my 315's on. My speedo is off quite a bit so it takes even longer for my TC to lock up. I think I have to hit about 55mph to lock it now in OD. If I try to pull my 10k travel trailer without a locked TC on main roads where the speed limit is usually about 45mph, I'm asking for trouble.

I was hoping someone would think of something like that.

I was actually going to suggest that someone (hopefully someone much smarter than me) would figure out a way to incorporate the "tow/haul" switch.
I personally never use tow/haul, it's pretty much useless IMHO.

If I could have that switch lock up my TC and still show the "tow/haul" display on the dash, well I think that would just be peachy!!

And it could still be used easily and kind of undetectable as an anti-theft devise.

What do yall think about this?


MT

 

cquestad, I did notice something after working the switch from your comments above. If I flip the switch at 35 in 3rd the TC locks up..this is ok, but it will not proceed to OD after accelerating, is this correct or not? Also, say I did this situation and have the switch on. When I turned the switch off, it would not go back to stock. When I stop at a light or stop sign and then proceed, it will only go into the gear that I had previously turned on the lock-up. It would only work normally/stock if I turn the motor off and restart. Am I missing something? Also, when do you see the rpms drop. When I am locked in when in 3rd the rpms are stay at around 2000. What was all the talk about the rpm's coming down?

 

Is the shifter in 3rd (OD off) when you hit the switch at 35? It can go in to 4th (OD) untill you hit the OD button again? Does that make sense?

Something is wierd...my tranny runs fine with it grounded...just the converter is locked.

 

Ok, here is the nitty gritty.

I have the shift lndicator in drive. I accelerate to 35 and turn the toggle on. The TC locks up fine. Then proceed an accelerate and it stays in 3rd, will not go into OD. I turn switch off and it still is locked, will not go into OD and will not return to normal operation until I turn the key off and restart.

I have a wire spliced to the 7 pin (yellow wire with blue stripe). I run that through the firewall to the 1st pole on the toggle switch and then I have another wire on the second pole of the toggle going to ground. I re-checked and that is ok. I am wondering if I need the resistor or the jumper wire, currently I don't have any of these.

Now, what do you mean by "It can go in to 4th (OD) untill you hit the OD button again?"? What OD button? All I have is D-2-1 and the tow/haul button. Sorry if I missed what you were trying to ask.