Engine/Transmission (1994 - 1998) Speedometer Question

[Demon Dodge]

While fueling up yesterday a guy pulled in with a 92. We started talking and he told me when he installed the nv5600 in his truck they tapped into the antilock sender to use as a source for the speedometer. Has anyone else done this? Would it work on a 97? I am tired of my 4 sp NV4500 and if I can get the speedometer to work I will install the NV5600 that has been sitting in the shop for a year.

Thanks guys, Rod

 

[Demon Dodge]

Come on Guys someone has to know some thing.

Thanks, Rod Oo.

 

[CumminsPower98]

You don't need to do anything to your speedometer unless you have changed tire size or differential gears. The '97 gets it's speed signal from an electronic gear driven sensor in the back of the transfer case so it doesn't mater what you do to the transmission, your speed will be correct. If you ever need to change the speedometer on the truck you will need to buy another driven gear with a different number of teeth. Mark

 

[scramblin]

You don't need to do anything to your speedometer unless you have changed tire size or differential gears. The '97 gets it's speed signal from an electronic gear driven sensor in the back of the transfer case so it doesn't mater what you do to the transmission, your speed will be correct. If you ever need to change the speedometer on the truck you will need to buy another driven gear with a different number of teeth. Mark

I think Rod's truck is a 2wd.

 

[CumminsPower98]

The same thing should be true for a 4x2 truck only the sensor should be in the back of the transmission rather then transfer case.

 

[Demon Dodge]

Cumminspower98... . My truck is a 97 2WD the NV5600 has no speedometer provision. If it were a 4WD the transfer case has the speedometer gear.

Now back to my original question. Can the signal from the anti lock be used to trigger the speedometer on a 97?

 

[Kirwin]

Speedometer provision

I put the NV5600 in my 97. I know its a 4wd but the signal generator is merely an alternator with a permanent magnet. This has been produced in several different ways over the years. My 89 wasn't available from the factory with cruise so I bought a Ram Van cruise unit and a signal generator that mounted in the speedometer cable for the 89 Dakota 4X4 application and it worked just fine. I'm of the opinion that the 97 (rear wheel not 4 wheel) anti-lock brake controller was a seperate computer that was fully incorporated into the vehicle's systems for the 98 model year and hence no more need for the alternator style signal generator in the speedometer drive. I'm not sure how many poles these alternators use to produce the signal but you might be able to come up with an alternate way of obtaining a signal based on drive shaft speed with magnets fastened onto the shaft and a pick up coil, much the same way as the old Sears aftermarket cruise control systems used for a speed signal. Hope this helps Ken Irwin

 

[vssman]

The vss unit that was used on the early 2nd gens have an 8 pole magnet. It runs on switching a 5V (can't remenber the exact specifics now) signal back to the PCM. Going from memory, I think DC started to phase out the VSS unit sometime in 97 and instead went to using the ABS pickup off of the rear end. Don't remember is they started with 4W ABS trucks first - but that seems to ring a bell.