I have a 98 Dakota 5 speed right now it has a 3.9 i am going to install a 3.3 cummins diesel 5 speed the questions I have are

where does the dakota get its tac sense

the spedo does that come off the rear end or the transmission

I am using a 5 speed from a 5.2 nv3500

I am within 2 weeks of pulling the plug and doing this most of issues I have worked out

 

You mean a 4BT swap? If you do post a build thread please!
I know that with the nv3500 you have a gear driven speedo as I am pulling mine to redo the output for bigger tires.

If you do go with a 4bt I would consider a nv4500 instead, the trq alone would fry a nv3500 unless you keep it stock and keep it gentle. Just my opinion though.

 

Your speedometer is electronic, as is the tach. The instrument cluster is a computer in itself. Some functions are programmable.

The displays are computer driven over the CCD bus, by the PCM. There are no mechanical connections whatsoever.

You'll need to keep the PCM in order to keep the stock gauges working.

 

no it is a cummins b3.3 not a 4bt its not as torkie as a 4bt and about 85-100 hp it runs a ve pump

 

thanks Dan what I was wondering is where it gets its input for tack signal off the crank sensor or the cam sensor I have a Dakota digital interface that uses a flywheel sensor just need to know where I can tap int that I am guessing the stock flywheel sensor is where I can tap in

 

It looks like you can use the crankshaft position sensor location.

According to the FSM, "Engine speed and crankshaft position are provided
through the crankshaft position sensor."

The camshaft position sensor is used in conjunction with the Crankshaft
Position (CKP) sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.

 

thanks Dan you are awsum I think its time to start my build