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 Technician Chris Your Own Question

Technician Chris
Technician Chris, Technician
Category: Car
Satisfied Customers: 345
Experience:  I am a certified ASE Master Technician with L1 Advanced Diagnostic Specialist and over 15 years experience.
Type Your Car Question Here...
Technician Chris is online now
A new question is answered every 9 seconds

I am trying to replace the rear u-joint on a 1994 GMC 4WD with

Resolved Question:

I am trying to replace the rear u-joint on a 1994 GMC 4WD with a 5 speed manual transmission. However, I am not able to remove the driveshaft from the trans tail shaft. What's the trick. What am I not seeing?
Submitted: 9 months ago.
Category: Car
Expert:  Technician Chris replied 9 months ago.

what engine is in the truck?

Customer: replied 9 months ago.

5.7

Expert:  Technician Chris replied 9 months ago.

DISASSEMBLY
1. Mark shaft for assembly reference.
2. Support shaft in a horizontal line with a suitable vice.

graphic

3. On models with external snap rings, remove snap rings, Fig. 4 . If ring does not snap out of groove, relieve pressure on ring by tapping lightly on bearing cap.

graphic

graphic

4. On all models, place joint in tool No. J 9522-3 or equivalent with lower yoke ear supported by 1 1/8 inch socket, Fig. 5 , then press out cap. If cap is not completely removed, insert spacer tool No. J 9522-5 or equivalent and continue to press, Fig. 6 . If using a vice in place of special tool, use 1 1/8 inch socket to receive one cap and 5/8 inch socket to push opposite cap.
5. Rotate joint in tool or vice and press opposite cap out, then remove cross from yoke.
6. Inspect and clean retaining ring grooves.
7. Check cap bores for burrs and imperfections.

ASSEMBLY
1. Use finger to coat needle bearings with thin layer of grease. Do not fill cups completely or use excessive amounts. Over lubrication may damage seals.

graphic

2. Put one bearing cap part way into one side of yoke, then insert cross into cap, Fig. 7 .
3. Press cross and cap into yoke until cap is flush with yoke ear.

graphic

4. Press opposite cap into yoke, ensuring trunnion alignment, Fig. 8 .
5. Continue to press cap into yoke ear while working cross to ensure free, unbinding movement until retainer groove clears inside of yoke. If binding occurs, stop pressing and check for misaligned bearings.

graphic

graphic

6. Snap retainers into place, Fig. 9 . Yoke can be sprung slightly with firm hammer blow if retainer is difficult to seat, Fig. 10 .


Before disassembling any universal joint, examine the assembly carefully
and note the position of the grease fitting (if used). Also, be sure to mark the yokes in relation to the propeller shaft for assembly reference. Failure to observe these precautions may produce rough vehicle operation resulting in rapid wear and parts failure, as well as placing an unbalanced load on transmission, engine and rear axle.

When universal joints are disassembled for lubrication or inspection, and
the old parts are to be reinstalled, special care must be exercised to avoid damage to universal joint spider or cross and bearing cups.
Customer: replied 9 months ago.

I understand this part. But I can't get the driveshaft out of the transmission (5-speed).

Expert:  Technician Chris replied 9 months ago.

the driveshaft should just slide right out. You have to twist it just to get it started, but it is not bolted or otherwise locked it. See below for a TSB that applies:

 

 

File In Section:XXXXXAxle

Bulletin No.: 46-41-01

Date: September, 1994

INFORMATION

Subject:
Slip Yoke Replacement and U-Joint Servicing

Models:
1995 and Prior Light Duty Trucks

U-joints that are pressed out of the propeller shaft or slip yoke must not be re-used. When it is necessary to press out the u-joint to replace a slip yoke, a new u-joint must be installed. A new u-joint is necessary as the bearing cup seals and slingers are easily damaged. If these components are damaged, dirt and water can contaminate the bearing causing early bearing wear-out. Replacement of the rear u-joint is not required if the retaining straps holding the u-joint to the rear axle pinion flange are removed.

Light duty trucks make use of three types of yokes:



1. Vented slip yoke. This yoke can be identified by a small hole in the center of the slip yoke welch plug. This yoke uses grease for internal lubrication. The internal splines of the yoke should be coated with a light covering of grease before installation to the output shaft. A small amount of grease may be forced from the vent hole during operation. No attempts should be made to plug the vent hole.
2. Non-vented slip yoke. This yoke has no vent hole and relies on transmission or transfer case fluid for internal lubrication. Grease should not be used on the yoke internal splines as it may contaminate the transmission or transfer case fluid.
3. Bolted or fixed yoke. This yoke does not slide so it needs no internal lubrication.

The transmission/transfer case output shaft seal should be inspected for damage before installing the yoke. The seal lips should also be greased before yoke installation for longer seal life and better performance.

Customer: replied 9 months ago.

There might be a two-piece driveshaft and a center support bearing. I think I will have to remove the bracket. Does that sound correct? Or do I have to do more to slide it out? Or more to free up the center bearing bracket?


 

Expert:  Technician Chris replied 9 months ago.
if you do have a center support bearing, the bracket will just unbolt from the bottom of the vehicle
Technician Chris, Technician
Category: Car
Satisfied Customers: 345
Experience: I am a certified ASE Master Technician with L1 Advanced Diagnostic Specialist and over 15 years experience.
Technician Chris and 11 other Car Specialists are ready to help you
Expert:  Technician Chris replied 9 months ago.
Thank you for the positive rating. It is very much appreciated. Please let me know if I can assist further.

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
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

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