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 Carhelp4u Your Own Question

Carhelp4u
Carhelp4u, ASE CERTIFIED TECH
Category: Chevy
Satisfied Customers: 5203
Experience:  ASE CERTIFICATION
Type Your Chevy Question Here...
Carhelp4u is online now
A new question is answered every 9 seconds

how to replace main seal on a tahoe chevolet 1996 model

Customer Question

No Comment Added
Submitted: 6 years ago.
Category: Chevy
Expert:  Carhelp4u replied 6 years ago.
Do you have any parts disassembled at this point? Are you looking on info on how to replace the seal alone or are you looking for the steps to access the seal and replace the seal?
Customer: replied 6 years ago.
no,parts or disassembled at this point.I have the replacement parts.I just need to know step by step ,on how to replace rear seal between oil pan transmission. Diagrams if you can send them.
Expert:  Carhelp4u replied 6 years ago.

Ok well the transmission and tranfercase must be removed to do this procedure. Here is what will need to be done. If you let me know if this is an automatic or manual, I can get you more info on the transmission removal. Feel free to contact me with any questions! Good luck!

  1. Remove the transmission.

Click image to see an enlarged view
Fig. 10: Rear main seal and retainer-4.3L, 5.0L and 5.7L engines

 

Click image to see an enlarged view
Fig. 11: Oil seal removal notches

 

Click image to see an enlarged view
Fig. 12: Oil seal installation tool

 

  1. With manual transmission, remove the clutch.

  2. Remove the flywheel or flexplate.

  3. Remove the oil pan.

  4. Unfasten the oil seal retainer screws and nuts.

  5. Remove the oil seal retainer and gasket.

  6. Insert a small prying tool in the notches provided in the seal retainer and pry out the old seal. Be VERY CAREFUL to avoid nicking or scratching the sealing surfaces of the crankshaft.

To install:

  1. Install a new gasket on the block and install the oil seal retainer. Tighten the screws and nuts to 11 ft. Lbs. (15 Nm).

  2. Install the oil pan.

  3. Coat the inner and outer diameters of the new seal with clean engine oil.

  4. Using seal tool J-35621, or equivalent, position the seal on the tool.

  5. Thread the seal tool attaching screws into the holes in the crankshaft end and tighten them securely with a screwdriver.

  6. Turn the installer handle until it bottoms.

  7. Remove the tool.

  8. Install the flywheel/flexplate, clutch (if applicable), and the transmission.

Customer: replied 6 years ago.
Reply to carhelp4uhere's Post: automatic transfer
Expert:  Carhelp4u replied 6 years ago.

Ok here is how to remove the transfer case.

See Figures 1, 2 and 3

  1. Raise and support the truck on jackstands.

  2. Remove the skid plate if necessary to gain access to the front seal.

  3. Matchmark and remove the driveshaft.

  4. Remove the nut, washer and yoke.

Some models don't use a washer at the rear yoke nut.

  1. Some models employ a shield around the seal. Remove it.

Click image to see an enlarged view
Fig. 1: Installing the output shaft seal

 

Click image to see an enlarged view
Fig. 2: Transfer case and components-NP241

 

Click image to see an enlarged view
Fig. 3: Transfer case and components-BW 4401 and BW 4470

 

  1. Using a hammer and a punch, carefully distort the seal so that you can pull it out with a pliers. Be careful to avoid damage to the seal bore!

To install:

  1. Coat the seal lips with clean oil fluid. Coat the outer edge of the seal with gasket sealer.

  2. Position the seal in the bore and drive it into place by carefully tapping around it with a hammer. If you have access to one, a seal installer will make the job a little easier.

  3. Install the shield, if used.

  4. Coat the outer surface of the yoke neck with clean oil and slide it into place.

  5. Install the nut and washer. Tighten the nut to:

    • NP205: 150 ft. lbs. (203 Nm)

    • NP208: 120 ft. lbs. (163 Nm)

    • NP241: 110 ft. lbs. (149 Nm)

    • NVG243: 110 ft. lbs. (149 Nm)

    • BW 1370, BW 4401, BW 4470 front: 165 ft. lbs. (225 Nm)

    • BW 1370, BW 4401, BW 4470 rear: 125 ft. lbs. (170 Nm)

  6. Install the driveshaft.

  7. Install the skid plate.

Here is how to remove the transmission.

See Figures 1 and 2

It would be best to drain the transmission before starting.

  1. Disconnect the battery ground cable.

  2. Remove the air cleaner.

  3. If equipped, disconnect the detent or TV cable at the throttle lever.

  4. On 4WD models, remove the transfer case shift lever knob and boot.

  5. Raise and support the truck on jackstands.

  6. Disconnect the shift linkage from the transmission.

  7. If it is necessary to disconnect the fuel line, relieve the fuel system pressure. Disconnect the fuel lines.

  8. Remove any skid plates that would interfere with transmission removal.

  9. Drain the transmission fluid.

  10. Remove the driveshaft(s), after matchmarking its/their flanges.

  11. Detach the speedometer cable or Vehicle Speed sensor (VSS) connector, downshift cable, vacuum modulator line, shift linkage, throttle linkage, electrical wiring, the fluid cooler lines, or any other component that would interfere with transmission removal.

  12. Remove the dipstick tube.

  13. If necessary, remove the starter motor.

  14. If necessary, disconnect the support bracket at the catalytic converter.

  15. Support the transmission on a transmission jack and unbolt the transmission rear mount or the transfer case adapter from the crossmember.

  16. Remove the crossmember.

  17. Remove any transmission support braces. Note their exact positions for installation.

  18. Remove the torque converter underpan, matchmark the flywheel and converter, and remove the converter bolts.

  19. If necessary for clearance, move the exhaust system aside.

  20. If necessary for clearance, disconnect the parking brake cable.

  21. Remove the transfer case and the adapter.

  22. Support the engine on a jack and lower the transmission slightly for access to the upper transmission-to-engine bolts.

  23. Remove the transmission-to-engine bolts and pull the transmission back. Rig up a strap or keep the front of the transmission up so the converter doesn't fall out.

To install:

Installation is the reverse of removal but please note the following important steps.

  1. Tighten the transmission-to-engine bolts to 35 ft. lbs. (47 Nm).

Make sure that the torque converter-to-flexplate matchmarks are aligned, the torque converter is flush with the flywheel and the converter turns freely by hand.

  1. On all except 1996-98 models, tighten the converter bolts to 50 ft. lbs. (68 Nm).

  2. On 1996-98 models, tighten the converter bolts to 46 ft. lbs. (63 Nm).

  3. Tighten the transmission support brace bolts to 35 ft. lbs. (47 Nm).

  4. On all except 1991-98 models, tighten the crossmember retainers to 35 ft. lbs. (47 Nm).

  5. On 1991-98 models tighten the crossmember retainers to 56 ft. lbs. (77 Nm).

  6. On 1988-94 4WD models, tighten the transfer case-to-transmission attaching bolts to 24 ft. lbs. (32 Nm) and the transfer case-to-frame bracket bolts to 35 ft. lbs. (47 Nm).

  7. On 1995-98 4WD models, tighten the adapter-to-transfer case and adapter-to-transmission bolts to 33 ft. lbs. (45 Nm).

Click image to see an enlarged view
Fig. 1: Automatic transmission and related components-THM400, 4L60E and 4L80E

 

Click image to see an enlarged view
Fig. 2: Automatic transmission and related components-THM700R4

Customer: replied 6 years ago.
Reply to carhelp4uhere's Post: automatic transfer
Expert:  Carhelp4u replied 6 years ago.
Scroll up and you will see that info. Thanks!

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 was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics