I have seen the description of the "official" Dodge/ Cummins/ Jacobs brake for the 48RE Auto trans. The literture mentions that it comes with a switch that installs on the column shift. At some pointI want to put a torque converter lockup switch in my truck-- and one of the things I am mulling over is the best way to locate the switch in a convenient spot. Is anyone familiar with the "factory" Jake switch (is it a momentary switch, or a push on/ push off?) and how it mounts on the column? Or know what it looks like or part # and price for the switch and install pieces alone? Thanks!

 

I can't help you much on the jake switch. But when I ever get around to re-wiring my lock-up switch I am going to put in a three way toggle. position 1 will be activated with a momentary switch located on the floor like an old high beam switch. position 2 will be off. position 3 will be a 2 way toggle located on the dash somewhere.

I find that when I am locking the converter that it is at slow speeds on secondary streets. the problem is that not long after I lock it, I have to unlock it because I come up to a stop sign or something. If I am on a long stretch of road then usually it is a service road and then the converter automatically locks in a 48mph. One more thing, you don't want to be locked up with the truck shifting gears, it is some very hard shifting...

 

thanks for the suggestions. what I mostly want is the ability, when driving unloaded to put it in 4th+locked below 48mph and keep it there. I end up doing a fair amount of driving in areas where the speed limit is 40 or 45 mph but where the truck seems very happy to stay in 4th+locked as long as I temporarily goose it up to 48 and keep it above 42 (or wherever it drops back to unlocked), but when trying to adhere to 40 or just a shade above, it seems like it is really easy for it to fall back to unlock. Ideally it would be nifty if I could find a wiring diagram to see whether there's any electrical lead in or out of the transmission that could give me a signal that it has shifted into 4th so that I could use that to either light an indicator LED to let me know it is OK to engage the TC lock (perhaps could also trigger a relay so that the TC could not be locked unless it is in 4th). Driving alone I can watch the tach and shift patterns to tell when I am in 4th; with others in the truck it would be handy to have a hint light.

 

The truck may chug at 40 in lockup,and any gains you get in mpg will be offset by additional wear on trans and engine.We advise the owner keep the truck out of od below 45mph with 4.10 ,and 50mph with 3.54/3.73,if they have the convertor locked with a lockup controller or device.The Cummins wasnt meant to be lugged down to the point of chugging,so if its chugging dont leave it there.I'd leave it as it is from the factory,it seems like its perfect as delivered.

 

Can't help much with the tech stuff other than I think it's a push/pull switch.
Oh ya here's the part number from dodge for ya 5102082AB.

Travist

 

OK, I am prepared to be flamed as a newbie here if this is something to which I already should've tumbled...

I am pretty sure I have the 3.73 because I could find no mention of a different axle ratio on my window sticker when I bought it. I hope I have the 3.73 because that is what I was hoping to get. I do have (and definitely like) the anti spin axle.

Is there any way to tell from markings on the axles or from the VIN what ratio I have for sure?

thanks to all for the insights and assistance!

 

 

Could they make that any bigger? Something a little more streamlined on the dash somewhere would look a whole lot better. Do you have to pull it to work or is it automatic?

 

You just pull it out and leave it pulled out for the Jake Brake to work. When not using the Jake Brake, push the button in, and it no longer works. When you pull the button out to use the Jake Brake, the engine sounds a little different when idling. Also, I'm told a cold engine will heat up a little quicker when the Jake Brake button is pulled. I use it when pulling a 35-foot Hitchhicker, and love it. I leave it on most of the time when pulling.

 

Used to be on a sticker in the glove box. Apparently the 06's no longer post it in the glove box. The 4.10 will be listed on the window sticker for 06's ($50 option)....if it's not, it's the standard 3.73.