How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Transtech Your Own Question

Transtech
Transtech, transmission expert
Category: Car
Satisfied Customers: 2
Experience:  transmission shop owner for 11 years
Type Your Car Question Here...
Transtech is online now
A new question is answered every 9 seconds

93 gmc: wheel drive..comeing..transfer case..speedometer

Customer Question

i have a 93 gmc sierraXXXXXcan not get to shift took to mechanic said it was not the trans he said that the spedometer was not working and would not let the trans shift he first told me computer that did not work so he told me to change the wire that was about 18 inches long comeing off the transfer case i did still can't get speedometer to work was wondering if any one had a suggestion
Submitted: 5 years ago.
Category: Car
Expert:  Transtech replied 5 years ago.
the ecm does need a signal from the speed sensor to comand the trans to shift. did you try replacing the speed sensor first? if so the next step would be to do a resistance check on the speed sensor circuit. check the resistance of the new speed sensor first than check the circuit on the two wires at the ecm. the reading should be the same or very close. this will verify the wiring from the ecm to the sensor. if it is not the same than trace the wires along the frame and look for a bad spot. usualy the wire will be corroded. also note some models had another module called a drac module inbetween the speed sensor and the ecm. if the drac fails and does not send the speed signal to the rest of the components the trans will not shift and other problems such as no speedometer or cruise control. if ecm is new and speed sensor circuit checks ok than suppect drac. hope this helps. let me know.
Transtech, transmission expert
Category: Car
Satisfied Customers: 2
Experience: transmission shop owner for 11 years
Transtech and 15 other Car Specialists are ready to help you
Customer: replied 5 years ago.
where is the speed sensor
Customer: replied 5 years ago.

where is the speed sensor

and how do i do a resistance check

Expert:  Transtech replied 5 years ago.
the speed sensor is on the rear of the transfer case where the driveshaft connects. you need a multimeter (volt-ohm meter) to do a resistance test. set the meter to ohms, and auto range or 0 to 100 on the scale. If the speed sensor has not been replaced i would try that first because the fail quit often and they are not expensive. You can get one at any parts store.
Customer: replied 5 years ago.

did u get your money do not know how this works

 

Expert:  Transtech replied 5 years ago.
yes, thank you
Customer: replied 5 years ago.
sorry one more question how do u check speed sensor truck running plug hooked up how does the prongs on meter get to it or whatever
Expert:  Transtech replied 5 years ago.
a resistance check is always done with the power removed from the circuit. if there is power on the circuit it will blow the fuse in the meter. turn truck off, unplug the wire connector from the sensor and touch one leed of the meter to one terminal in the sensor, the other lead to the second terminal. the resistance should be 370 ohms to 440 ohms.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time! Paul M Corpus Christi, TX
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician