Ok guys, i know there was a thread on here before about a tc lockup switch on the 3rd gens but i cant find it. Ive got an '03 S.O. with the 47RE. Just put a billet tranny in it and im ready for a lockup switch. Anybody have a writeup on it?

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'03 quad cab 4x4 swb laramie.
Edge HOT juice w/att. Full gauges. Billet tranny. S&B cold air intake

'91 GMC Topkick Cat 3116 w/a 48' dropdeck trailer. XM Radio, sleeper.

mystery switch 47re

its not the thread you were looking for but the top on will be the one you want to use, it says 96-02 on it but im pretty sure they changed transmissions halfway through 03 not 02(i could be wrong though) maybe someone else can confirm that or not

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'06 Cummins 4" exhaust and 8" stack , silencer ring, muffler and cat MIA, Autometer Phantom II gauges (Boost, Tranny, EGT, FP), AFE stage 2, propane, and Smarty PoD

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Well, the S.O. 03s like mine still have the 47 RE but the electronics are different. Ive done them on older ones and you end up just grounding out a specific wire. I found a writeup on the newer ones a year or two ago and did it to a buddys '05. It required putting a resistor in the line also, cant remember what size or exactly where

25ohm 1/2 watt resistor on ground wire

Thanks. And what wire do i run it to?

im not sure, i cant find the site i was reading it all from, but if you google 47re mystery switch you will get ALOT of sites to look at, alot are on DTR

I'll crawl under my truck later today and see what color wire you splice into.

Or should I say the pin #.

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Awesome, i appreciate it. I was looking at the 47re mystery switch but everything ive found is for a second gen with the 47re since theres not many 3rd gens with one. I figured since the electronics were probably the same as a 3rd gen 48re it would be the same as one of them. Its my understanding that on the 3rd gens the only diff between the 47 and 48 is the 47 has aluminum planetaries and the 48 has steel.

Is there somewhere that has a good proven way to do this to the 48re tranny? I have tried searching but not much luck.

Thanks, Austin

Yes, tap the wire for pin #7 on the transmission control harness. Pin #'s are on the plug.

Run the wire to one side SPST switch.

Run the other side of the switch to a chassis ground, and, in the this leg place a 33 ohm 1/2 watt resistor.

Done, now you have a switch that will lock the TC in 2nd, 3rd, and OD on demand.

Couple of things to know about this though, much less than WOT and it will stack shift into OD.

No down shift from whatever the top gear is.


WILL break input shaft if not careful.

cerberus60's Sig:

05 3500 QC SRW LWB 4x4, Smarty REVO, ISSPRO Gauges, 48RE, OPIE Inpu,t Billet Single Disk TC, Transgo Kit, other tweaks and parts

92 D250, 370 Marine Inj tips, Tweaked pump, HX35 60\16, 47RH, Billet TC, Transgo Kit

SPST switch? I understand the concept and do have a fully built tranny but the one thing I hate about the dodge trannys is that it does not fully "grab" I guess you can say at WOT. Although, as soon as I hit 75-80mph racing the TC locks up and it starts hauling ass.

Also, where is a good place to put the switch?

SPST= Single Pole Single Throw. Switches are classified by how many contact poles and switch throws they have, amongst other things...

As far as where to put the switch, anywhere handy for you to operate it if you want it.

Additional information for those with a 48RE:

If you tap the wire on pin 6 in the same manner, you will lock the trans in 4th gear... That's handy information for those looking to load their truck on the Dyno...

wildcat's Sig:

Bill Mish
2007 Dodge 3500 4X4/5.9L/48RE, KORE, SRT-10 hood, Recon, Isspro, ICEBOX/Amsoil, Walbro, SMARTY, CFM+, HGD, 5" exhaust. TC & VB 458hp/1005tq 14.3 @94 MPH
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You don't need to lock it into OD. Locking the TC will automatically lock the trans into OD unless you purposely modify the VB to defeat that.

I am going to try that this weekend!
So after splicing into the wire, do you run straight to the switch, then on the way back put the resistor in place there? Im not cocmpletly electricly enhanced yet sorry.
and when you say ground it, ground the #7 wire? If so then how does the switch work?

Thanks and sorry im difficult
-Austin

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Ok everything makes since with pictures!! Eventually found this

Auto Tranny Manual Lockup

I just got done doing the mod. Took about 45 minutes total to do everything. I did hook it up with a momentary switch but now I am thinking of getting a regular on-off switch.

Also, the mod works great! I would not recomend doing this on a stock tranny though unless you have no extra added power. I can see exactly how you could snap input shafts doing this mod. I could deffinatly tell it made the truck somewhat faster
I am going to do a 0-60 run with the edge later and let yall know what exactly happens!

I respectfully disagree. If that were the case, the switch would be useless in any gear but overdrive, which it isn't. It will lock the TC in 1st, 2nd and 3rd, and does not prevent downshifting if you floor it.