Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Bad Vibes!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by tigerk5, May 27, 2003.

  1. tigerk5

    tigerk5 Registered Member Premium Member

    Joined:
    Aug 5, 2002
    Posts:
    82
    Likes Received:
    0
    Location:
    Jacksboro, TX
    I have a problem. While driving on the road, acceleration is no problem. When I let off the gas I hear a roar from under the truck. I can't determine if it is the rear diff or the transfer case. Anyone have any ideas?
     
  2. bajaviking

    bajaviking 1/2 ton status

    Joined:
    Apr 10, 2002
    Posts:
    752
    Likes Received:
    2
    Location:
    Baja
    Check your u-joints.
     
  3. georgiared84

    georgiared84 1/2 ton status

    Joined:
    Sep 5, 2002
    Posts:
    487
    Likes Received:
    0
    Location:
    Austell, Georgia
    If it doesn't end up being your u-joints, check your rear diff fluid. That roaring on decel sounds like it may be your carrier bearings.
     
  4. tigerk5

    tigerk5 Registered Member Premium Member

    Joined:
    Aug 5, 2002
    Posts:
    82
    Likes Received:
    0
    Location:
    Jacksboro, TX
    The U-joints are fine. That was my fist thought as well. I am going to pop the cover tonight to have a look at the rear diff.
     
  5. txbluethunder

    txbluethunder 1/2 ton status

    Joined:
    Jan 29, 2002
    Posts:
    835
    Likes Received:
    0
    Location:
    Austin, TX
    did you drop your t-case or extend your drivelines when you did your lift? if not it could be slop in the slip yoke. mine did that with a 2.5" lift.
     
  6. tigerk5

    tigerk5 Registered Member Premium Member

    Joined:
    Aug 5, 2002
    Posts:
    82
    Likes Received:
    0
    Location:
    Jacksboro, TX
    I did drop the t-case when I put in the lift. I just started about 2 weeks ago. It is driving me crazy!
     
  7. georgiared84

    georgiared84 1/2 ton status

    Joined:
    Sep 5, 2002
    Posts:
    487
    Likes Received:
    0
    Location:
    Austell, Georgia
    betcha 10 bucks you'll find metal in that diff fluid. /forums/images/graemlins/eek.gif
     
  8. georgiared84

    georgiared84 1/2 ton status

    Joined:
    Sep 5, 2002
    Posts:
    487
    Likes Received:
    0
    Location:
    Austell, Georgia
    BTW, if you do need a set of diff carrier bearings, let me know. I've got a set of motor city ones with races you can have. I bought them last year for the next time I rebuilt my 84 ten bolt and ended up replacing the whole rear, so I don't need them.
     
  9. TXsizeK5

    TXsizeK5 1/2 ton status

    Joined:
    Aug 26, 2001
    Posts:
    2,518
    Likes Received:
    0
    Location:
    College Station, TX
    From what I've had experience with... and trust me i had the same problem. Its 1 of 2 things. Tcase Chain... if it has slack, upon decell it will do that. or in my case it was the driveline angle at the tcase. I got a CV shaft and no more vibes at all. No more roaring on decell, etc.
     
  10. tigerk5

    tigerk5 Registered Member Premium Member

    Joined:
    Aug 5, 2002
    Posts:
    82
    Likes Received:
    0
    Location:
    Jacksboro, TX
    Spent a lot of quality time with the Blazer tonight. Have decided, with the help of of other Blazer fans, that the noise is coming from the t-case area. I get the noise a little on acceleration, and more on decelaration. If I slide it into N going down the road, I get it all of the time. Any more advice? BTW thaks for all of the responses!! I appreciate all of your experienced input, and your volunteering of parts!! It makes me proud to be a memeber of the K5 community!!
     
  11. georgiared84

    georgiared84 1/2 ton status

    Joined:
    Sep 5, 2002
    Posts:
    487
    Likes Received:
    0
    Location:
    Austell, Georgia
    Hey, let's start doing guess that problem pools. We each put up $2 and name what we think someone's prob. is. When they finally get it apart and post the result, the closest one gets the pool. (OK, I know we have some guys in blue here, so notice the laugh pics I'm about to put) /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
    I'm still bettin driver's side carrier bearing. (even though it sounds like it's coming from farther forward.)
    Let us know when you figure it out.
     
  12. tigerk5

    tigerk5 Registered Member Premium Member

    Joined:
    Aug 5, 2002
    Posts:
    82
    Likes Received:
    0
    Location:
    Jacksboro, TX
    I will do that. Tonight I plan on popping the cover. If you are correct, I will have a beer in your honor. I will also email you one. What's your flavor!
     
  13. georgiared84

    georgiared84 1/2 ton status

    Joined:
    Sep 5, 2002
    Posts:
    487
    Likes Received:
    0
    Location:
    Austell, Georgia
    did you get it figured out?
     
  14. tigerk5

    tigerk5 Registered Member Premium Member

    Joined:
    Aug 5, 2002
    Posts:
    82
    Likes Received:
    0
    Location:
    Jacksboro, TX
    At this point, I have been living with the vibes! I am using the K5 often this time of year! Hopefully I can break her down next weekend.
     
  15. TopOff

    TopOff 1/2 ton status

    Joined:
    Jan 16, 2002
    Posts:
    1,760
    Likes Received:
    0
    Location:
    Folsom, ca
    I seem to have this same exact problem as you describe.

    I found my rear driveshafts slip yoke has wore through the plastic /forums/images/graemlins/angryfire.gif they put on the splines.

    I too tried changing the U-joints with no luck.

    Good luck with yours.
     
  16. Pookster

    Pookster 1/2 ton status

    Joined:
    Nov 21, 2000
    Posts:
    3,195
    Likes Received:
    0
    Location:
    NYC, NY, USA
    Have you figured it out?! cause I get the same problem!
     
  17. imiceman44

    imiceman44 1 ton status

    Joined:
    Aug 5, 2002
    Posts:
    15,160
    Likes Received:
    1
    Location:
    Sacramento, CA
    One more thing to consider is the pinion bearing.
    Easy to check, just grab the pinion yoke and try and shake it up and down.
    That was my problem.
     
  18. frank8808

    frank8808 Registered Member

    Joined:
    Jul 20, 2002
    Posts:
    15
    Likes Received:
    0
    Location:
    San Diego CA, USA
    I have the same problem. Had the Diff Checked.(No Problem) Had the u-joints replaced.(Still the same noise) I think it's the Transfer Case. I'm going to take it to the shop next week. It's somthing I did'nt have to much experince with.
     

Share This Page