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Old 10-25-2011, 01:14 PM   #1 (permalink)
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This is so frustrating

Some of you know who I am and what my rig is all about, if not here: 1990 Dodge D150 cab on a 1993 dodge W150 frame and 1 ton suspension and a 2001 V-10 powerplant. My truck runs and drives amazing, better than i anticipated. There is only one problem that is blowing my mind... the speed gauge does not work. The only thing that is dis connected from this chassis and cab is the engine harness from the 360 tbi. can anybody help me with this. OH and by the way i'll be posting a video of my rig here soon!
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Old 03-21-2012, 09:03 PM   #2 (permalink)
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Can any body help me with this? My milage counter works but only moves about 1/10th of a mile every 200 miles... I dont mind switching all my gauges over to a custom dash with a mechanical speed gauge but i would need some input on how to convert my transfer case to mechanical, its an NP 241 but only if i cant get this to work... Please help
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Old 03-21-2012, 09:57 PM   #3 (permalink)
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I don't know if this helps but the 2001 dodge computer runs the spedo off the rear diff. they have a tone ring in them. Is the computer looking for that?
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Old 03-22-2012, 06:54 AM   #4 (permalink)
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I don't know if this helps but the 2001 dodge computer runs the spedo off the rear diff. they have a tone ring in them. Is the computer looking for that?
You are right after it reads the ring gear and processed through the PCM it is then sent to the instrument cluster through a data buss which my truck does not have. Or would my gauge cluster be compatible
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Old 03-22-2012, 06:55 AM   #5 (permalink)
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is the 90 speedo a mech drive or a vss/elec motor like a 91/92 truck?
It is a vss and an electric gauge
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Old 03-22-2012, 07:53 AM   #6 (permalink)
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Yeah all the '90 and up speedos are electric. '88 and '89 are mechanical with a pass-through speed sensor for the computer so they are sort of both. If yours is looking for the count from the tone ring on the rear axle and all it's getting are the pulses from the speed sensor on the transmission/transfer case, you probably are not getting enough pulses. I wonder if one of the Dakota Digital boxes wouldn't solve this problem for you?
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Old 03-22-2012, 09:16 AM   #7 (permalink)
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Yeah all the '90 and up speedos are electric. '88 and '89 are mechanical with a pass-through speed sensor for the computer so they are sort of both. If yours is looking for the count from the tone ring on the rear axle and all it's getting are the pulses from the speed sensor on the transmission/transfer case, you probably are not getting enough pulses. I wonder if one of the Dakota Digital boxes wouldn't solve this problem for you?
Please explain what exactly the dakota digital box is. Also i dont quite see how that would relate to the malfunction by disconnecting the old engine harness... Also i forgot to say i did at one point get the speed gauge to work for about 5 seconds litteraly. I acheived this by jumpering the reference pick up to the 5v supply to the vss and then it stopped
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Old 03-22-2012, 11:24 AM   #8 (permalink)
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I have the same problem with my 2001 2500 ram. I swapped a 14 bolt in the rear and ... low an behold.. speedo no worky.
My attention is diverted to other more important build upgrades at the moment but I will eventually seek out a solution.
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Old 03-22-2012, 11:47 AM   #9 (permalink)
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Please explain what exactly the dakota digital box is. Also i dont quite see how that would relate to the malfunction by disconnecting the old engine harness... Also i forgot to say i did at one point get the speed gauge to work for about 5 seconds litteraly. I acheived this by jumpering the reference pick up to the 5v supply to the vss and then it stopped
http://www.dakotadigital.com/index.c...rod/prd126.htm
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Old 03-23-2012, 06:51 AM   #10 (permalink)
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Awesome thank you! With this would i need to replace my vss with a pulse generator? If i am not mistaken the distributer on the 360 i pulled out was the pulse generator?
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Old 03-23-2012, 09:58 AM   #11 (permalink)
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A speed sensor IS a pulse generator.
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Old 03-23-2012, 01:56 PM   #12 (permalink)
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I believe you still have to incorporate a tone ring. The dakota digital reads the ring, which will have teeth or notches. Calibrate the digital to that ring for it to then provide the speed output to the PCM (which must be the one thats needed to run the v10).

Search around on here for "vss". There are tons of threads about it. For your case, I'd probably suggest creating the tone ring to be on the tailshaft of the transfer case. There is a thread here, iirc, where someone did that. I don't remember if it was a truck, I think it was a jeep.

Why the tailshaft? b/c your rear axle is not a 00/01 dodge axle, which would have the tone ring and sensor in the rear diff.

Search for those other threads here to see your other options.
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Old 03-23-2012, 02:16 PM   #13 (permalink)
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I believe you still have to incorporate a tone ring. The dakota digital reads the ring, which will have teeth or notches. Calibrate the digital to that ring for it to then provide the speed output to the PCM (which must be the one thats needed to run the v10).

Search around on here for "vss". There are tons of threads about it. For your case, I'd probably suggest creating the tone ring to be on the tailshaft of the transfer case. There is a thread here, iirc, where someone did that. I don't remember if it was a truck, I think it was a jeep.

Why the tailshaft? b/c your rear axle is not a 00/01 dodge axle, which would have the tone ring and sensor in the rear diff.

Search for those other threads here to see your other options.
Actually yes, my rear axle is a 1996 dana 80. On the other hand the v10 in the truck is stand alone litteraly 2 wires that are hooked to the betterie and thats it. So yes there is a tone ring on the axle wired in and it worked before the swap. I believe 1990 only used the tone ring for rear abs. Where the newer dodges used the tone ring and front wheel rings for the speed sensor. I just ordered an 8 k pulse generator and digital box and the guy at dakota digital said i should wire it independly
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Old 04-09-2012, 06:18 PM   #14 (permalink)
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How come nobody told me the mother fucking speed sensor housing was adjustable? Fuck me!
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Old 04-09-2012, 08:05 PM   #15 (permalink)
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What housing? Where the speedometer pinion is?
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Old 04-09-2012, 08:48 PM   #16 (permalink)
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What housing? Where the speedometer pinion is?
Exactly how dumb can i be i thought the pinion was centered and not off-set
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Old 04-09-2012, 09:15 PM   #17 (permalink)
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Yeah, it should be marked for the range of the number of teeth on the gear to move it in against the spiral gear. I would have mentioned it but it's fairly common knowledge so I didn't think about it.
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Old 04-10-2012, 07:38 AM   #18 (permalink)
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So now i have to go back and start trouble shooting everything i have already tryed :P should get my dakota digital stuff this week ordered it 4 weeks ago now...
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Old 04-10-2012, 12:54 PM   #19 (permalink)
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Look at the bright side, with the Dakota Digital box, you shouldn't have to worry about tracking down the correct speedometer pinion for your gearing and tire size. Some of them are no longer available so it's rare NOS or a lot of junkyard/transmission repair shop digging.
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Old 04-12-2012, 01:44 PM   #20 (permalink)
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Parts came in today ill let you know if it works i talked to dakota digital and im going to get a credit from them and install a digital instrument cluster... So this means a costome dash build on the way!
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Old 04-14-2012, 04:02 PM   #21 (permalink)
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I got the pulse generator and digital conversion box hooked up today and it was't too hard if you ask me. The harest part is the calibration. While i was hooking this up i figured out why my stock vss did not work. First was the pinion angle, second was the bk/lb wire ( ground) was not connected to ground.
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