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Thread: VSS question

  1. #1
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    VSS question

    Can I put a VSS from a NP231C in my D300?

    I have a d300 long output that iirc will accept a vss from the np231j. But I need one from an chevy so that it will work with the TBI ECM.

    Do the NP231 J and C share the same type/size of VSS?
    My latest project... Collection of Parts

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    NO help on whether it will fit but once you get it running google search GM TBI DRAC(Digital Ration adaptor controller). Most times you'll be able to modify this Drac to get your Speedo to read right. I did this on my old Jimmy when I went from 235's to 33's.... worked perfect.

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    ^ thanks for that info. found that last night looks like it will work slick.

    still need to know if I can put a VSS from a NP231C into a D300..... Anyone?

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    will a vss from a 91 work????????

    The speedo cable will pass through and give you a signal.

    The '91 YJ speed sensor threads directly to the original speedometer drive housing on the Dana 300 case.


    In order to fit the '91 YJ speed sensor to the 7/8" female threaded of the stock CJ speedo cable, you need a thread adapter. This black plastic thread adapter has 5/8" ID female threads and 7/8" OD male threads and allows the CJ speedo cable with the large end to thread onto the 5/8" male threaded YJ speed sensor.

    The tread adapter was used on stock '87-'90 XJ Cherokees with factory cruise control, up under the dash on the cruise control speed sensor.

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    Why don't you give a parts shop a call and tell them what you're up against.

    "I'm building an offroad Jeep here, and need to know if the part numbers for the VSS out of this jeep and that jeep are the same, and if yes, cost and availability please." You need to know what vehicles came with the 231C and 231J
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    Quote Originally Posted by pav1 View Post
    will a vss from a 91 work????????

    The speedo cable will pass through and give you a signal.

    The '91 YJ speed sensor threads directly to the original speedometer drive housing on the Dana 300 case.


    In order to fit the '91 YJ speed sensor to the 7/8" female threaded of the stock CJ speedo cable, you need a thread adapter. This black plastic thread adapter has 5/8" ID female threads and 7/8" OD male threads and allows the CJ speedo cable with the large end to thread onto the 5/8" male threaded YJ speed sensor.

    The tread adapter was used on stock '87-'90 XJ Cherokees with factory cruise control, up under the dash on the cruise control speed sensor.
    So this is what I have learnt.

    The jeep stock vss in my YJ will fit the d300 I have and it is gear driven. However it is a 4 pulse/revolution when what is require by the gm ECM is a 2 pulse.

    I'm told that the 91 YJ one is the same pulse as the newer version that was post91.

    The one from the xj that is up on the dash I have not been able to find out if it is 4 or 2 pulse. Does anyone know?

    I called just jeeps and spoke with adrian. He was very helpful but I believe he is unfamiliar with territory.

    I can by an adaptor from JTR and I believe that it is the route I will follow.

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    Jags that run have what you need, but they're $75

    http://www.jagsthatrun.com/Pages/Spe...eedometer.html

    and Novak has them for $84

    http://www.novak-adapt.com/catalog/sensors.htm

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    I'm runing a 1970 Chevy 350 in an 88 yj. Now i don't need the vss. As I running a 5spd chevy tranny (NP3500) and t-case ( NP231C ) Old school carb and speedo cable no cpu involved. Now from what i have been told and researched ( and orderd parts for) it is from a S-10 or Blazer 4X4, 88 to mid 90's v6 4.3l and or 2.2l 4cylinder In line

    Mine has the vss sensor and vacuum tubes on it I but just caped them off as i didn't need them.
    I guess what I'm rambling on about is that Chevy Blazers and S-10's 4x4 5spd's and auto's came with that T-case, and the stock speedo cable or electric speedo will fit on a NP231J. Not sure if what i said helps but anways.
    Last edited by DWG; 08-05-2012 at 02:00 AM.

  9. #9
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    his dilema is that there is no exciter ring in the Dana 300 so a vss from a late 80's chevy won't work.

    Click image for larger version. 

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    he needs a cable driven vss

    Click image for larger version. 

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  10. #10
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    how many pulses on the late 80's dodge truck vss, probably the same as the jeep??????????

    Click image for larger version. 

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  11. #11
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    Quote Originally Posted by DWG View Post
    I'm runing a 1970 Chevy 350 in an 88 yj. Now i don't need the vss. As I running a 5spd chevy tranny (NP3500) and t-case ( NP231C ) Old school carb and speedo cable no cpu involved. Now from what i have been told and researched ( and orderd parts for) it is from a S-10 or Blazer 4X4, 88 to mid 90's v6 4.3l and or 2.2l 4cylinder In line

    Mine has the vss sensor and vacuum tubes on it I but just caped them off as i didn't need them.
    I guess what I'm rambling on about is that Chevy Blazers and S-10's 4x4 5spd's and auto's came with that T-case, and the stock speedo cable or electric speedo will fit on a NP231J. Not sure if what i said helps but anways.
    All great information. But as pav has stated the vss from those all use a toner ring and not a gear drive. When I started this thread I was hoping that someone would be able to tell me that the vss from the np231c had the same pick up as the j. But I heard otherwise.

    I have ordered the part from JTR and I'm hoping that it arrives within a week.

    Thanks for all the help

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