I know the 04 48re have a OD lock out, I have a 05 48re with the tow/haul mode,I wonder if there is a way to get both on this tranny?

 

Yep. Even the 545RFE behind the '05 Hemi allows O/D while in tow/haul mode. GM had the same issue when they introduced the Allison tranny. Owners complained and GM came out with a kit that allows the driver to lock out O/D while in tow/haul mode. Hopefully DC will do the same or an aftermarket vendor will offer a software flash. Who do we write to voice our opinion about this?

 

i want a kit to lock out overdrive in my 05

 

Well I been about this for weeks now. Been trying to get owners to tell how it works . Dealers are claiming the trans is so smart it'll stay in third when needed. I dont buy that bull. And so far I havent bought a new truck as a result either. I drove a 2004 and it worked beautiful. Was going to buy a 2005 and drove one and found out you cant lock out 4th.
I guess all you can do is complain to the dealers, But all the dealers I talk to spend about 20 minutes giveing me a line about how well this new setup will work. So not owning one I been trying to get some input from people who have done some towing in hills and mountains. Maybe the aftermarket will come up with something??? I was told by one outfit that on federal emissions trucks that the 4th gear is controlled with a single ground wire and a simple on off switch could correct this.?? But on california emmisions it was more complicated .!! That being said I was led to believe that all 2005 were or had california emmisions.
It's my opinion that if you cant lock out that 4th gear in the 48re it's going to be a vary poor tow truck in the hills and mountians.

 

its just a pain in the but when your pulling 12000lbs through a small town with traffic and the darn thing will shift into overdrive at 40mph. as long as you keep the pressure on the pedal it will stay in third but as soon as you let off for a curve or slowpoke it shifts into 4th then it has to downshift into 3rd again to continue on its not a good design for big loads would probably be fine for pullin a bass boat or something small

bluepp, can you tell me more about this ground wire to disable 4th i need to do something

 

( Diesel transmission Technology ) Phone 1-866-504-4002 Ask for Bill.
Bill told me that on Federal emissions trucks it was a simple ground wire ,that you could tap into with a simple off- on switch to controlle it. But that on california emissions trucks it was much more complicated, more computer involved.
That being said, arnt ALL 2004.5 and 2005 trucks california ready for emissions.??
I been calling these aftermarket trans co. to see if they have a gidjet to correct this. So far no luck. Bill was the only one that talked to me for more then 2 minuts.
Dodge is looseing a sale from me as I'm not buying a trans that I know from gitgo wont work right. The dealers are trying to tell me that the trans is smart enough to be in the right gear at all times , which is a bunch of bull----. I feel if theres enough complaint made to EVERYONE involved , (dealers ,aftermarket co., salesman, FACTORY ,STAR, etc ) they'll come up with a fix.

 

its not that smart as i explained above of some of the stupied things it does

 

I agree with you pecondude, The trans is going to do just what your footfeed tells it to do. I can see where it'll do exactly as you say ,coasting along at 40 mph in town with 12000lb trailer it'll go into 4th , then labor and downshift back to third as you step up speed again. Then a car pull out in ft and you let up and into 4th she goes again.
The problem I'v run into is trying to tell that to dealers and salesman. They look at you and say whats wrong with that. I got 4 local dealers here, none of them get the picture.
Most dealers and salesman dont even know you cant lock out 4th on the 2005s till you tell them .
But dont get to discouraged , you cant lockout the great ferd torqueshift either.

 

Pecondude ,
Did you call them ?? Keep us posted. Was in another dealer yesterday. The salesperson and the trans man knew nothing of the fact you couldnt lockout 4th in the 2005s 48re. But one other person in the dealership did know this, but told no one . This tells me they dont want you to know or its not a important issue with them. However all transmission repairman in dealerships I'v talked to agree it essential to be able to lockout overdrive when needed to make a good tow vehicle.

 

Hey guys, keep up the good work! If we can find a way to fix this and the 70mph vibe we will have our cake and eat it too! My brother-in-law is a diesel mechanic and he told me the same thing when I was telling him about our trannys this evening about a ground wire. May be something to it.

 

Chris Strickland was telling me it would be easy to wire up a tc-lockup switch. I'll check all-data today at the shop to find out exactly which wires are for OD and for TC-lockup. According to Chris, you can have a switch to lockup the TC anytime you wanted, and one to keep OD off. He said it was as simple as removing the ground from the TC solenoid. When it's on, the TC is UNLOCKED, when the solenoid is off, the TC is locked. Same for overdrive, when the solenoid is ON, it shifts to OD, if it never activates, it will stay in 3rd.

 

John Rodriguez,
Way to go John , lets get this Chris Strickland to come up with a wire diagram or some such so we can get these 2005 48res to work right . Theres no reason to have a truck work like this.

 

GREAT JOB!!! I hope this works out! It seems to me that a truck guy at Dodge with a couple of degree's would have thought of this, huh? Oh well some times you can't see the forest for all the trees!

 

Fellas I am confused

I have a diesel with an automatic and it has a tow/haul cutoff switch at the end of the handle that shifts into drive. I was assuming that if you pressed it in that the truck would not shift into 4th gear. Am I incorrect in this assumption? If I am can someone please explain to me what happens to the truck when you push the button that says tow/haul.

 

grizzlydiesel,

You are correct concerning the Tow/Haul button on the shift lever. In the 04.5 models and earlier, if you put it into the Tow/Haul mode it would lock into 3rd gear. With the '05 models, we find that it will not due this. Instead, it goes through 3rd into 4th just as if it were not in the Tow/Haul mode.

By the way, it might be a good idea to fill out your signature so as we can know what kind of truck you have.

Alan