This truck is a '68 so there's no speed signals behind that comming off the Dodge transfer case. It will rev and I can get it above 2000, but not much - maybe that's the issue. I'll play with that today. Scott willing to just give advice for free?

Peter

 

My mistake, I was thinking you had a newer F250, guess I should have looked at your signature...

If you are limited with rev's then I'd bet that is your problem. The speed signal is not connected or doesn't have a good connection. It sounds like they mounted something on the driveshaft to create the speed signal. The ECM just needs to see a pulsed signal (frequency of the pulses doesn't really matter as I understand it). So I'd look at the sensor on the driveshaft, check the connections, usually those sensors need to be mounted within 0.020" or so to work properly. Maybe the shop put it all back on but didn't mount the sensor close enough to the driveshaft? Is there a tone ring on the drive shaft? A ring with notches in it?

 

I think you are right about being rev limited. I have two ways to judge RPMs and I don't have 100% faith in either. I have a ScanGauge II connected to the ODB II port, but I'm not sure what it is getting from the EMC - a pulse stream or a number. It reads 2,300 max. My AutoMeter tachometer shows higher. It is reading a 4 tooth sensor on the front crank, but I don't think AutoWorld calibrated it when they put the Cummins in and it probably thinks it is still connected to the V8. I have an email into AutoMeter to figure out how to set it up for the 4 tooth sensor.

My speed sensor is on the tailshaft of the Dodge transfer case. I'll have to trace it to where it is connected. Unfortunately it runs on top of the tranny forward and I may have to open up my tunnel to see where it goes.

Thanks for the help.

Peter

 

Just an FYI, on my excursion, it uses a tone ring in the rear diff and a sensor mounted in the differential housing. It has two wires which ran up to something (may have been the ford pcm, can't remember) that converted that signal pulse into the speed signal pulse output that went to everything else (abs, speedometer, cruise control, etc). I originally tried using the signal from the diff to my ecm and it didn't work. So you need to make sure you get the actual speed signal after it's been converted. I'm sure autoworld had to use something to do this.

However, I'd lean towards the problem being related to something the tranny guys touched (since that is when the problem started)...

good luck

 

There is nothing in my differential, and other than the cam sensor and the crank sensor the only other thing is the speed sensor on the transfer case. I assume the tranny guy just did something wrong putting the tranny back in, but finding it may require taking the tranny back out.

Peter

 

Do you know what model of transfer case it is? Any pics of this sensor on it? Did it come with the 05 cummins, and 48re? If so it would be a 271 if manual shift or a 273 if electronic shift. Neither of which have a speed sensor from the factory, I'm kind of curious how they adapted one...

 

It's a manual shift Dodge that came with the 48RE. The sensor is in the tail housing and looks like any speedo sensor I've ever seen. I'll try to get a picture posted today.

Peter

 

Here's a tailhousing off a dodge 271/273 on the right. On the left is a tailhousing off a ford 271/273. Neither of them have a sensor, nor doss the shaft have a tone ring.



Are you sure you aren't talking about the speed sensor in the back of the transmission? It's on the drivers side (in the overdrive section of the tranny), angled downward right infront of the crossmember mount? The overdrive section of the trans bolts onto the main transmission case, so I can see someone confusing this with the transfer case.

Here's a pic that shows the speed sensor I'm talking about. It's under Ethan's left hand.

 

Finally got under the truck today to take a picture. Not sure where AutoWorld found this. My first suspicion is that this didn't get put back together right.

Peter

 

Well, that's not a 271 or 273 transfer case. Looks like a 241 maybe (out of a 2nd gen dodge)... Regardless, that's the sensor they would be using for the signal. Check your connections where the tranny shop would have disconnected it...

 

Is 241 a manual version of the 271/273?

Peter

 

So Ethan's doing the trans work, well it should be a good runner then

 

????????????

Peter

 

Just kidding My boys used to help me work on my Diesels when they were young, now they both work on them for a living! Ethan looks like he could be a convert already.....

 

There are a few flavors of 241 cases. 241DLD and 241 DHD, the DHD has alittle stronger parts in it (heavier duty). These came in the 2nd gen dodges up to 02. The 271/273 cases are alot bigger (in all aspects) and can take more torque. Rated alot higher.

Grey Wolf,

Yea, Ethan does all the tranny work. My next oldest boy Matthew is the transfer case specialist. Here's a shot of him in action replacing the input shaft I tore up in my old 241DHD case...