Results 1 to 9 of 9

Rear of 99 Z28 Twichy at full throttle

This is a discussion on Rear of 99 Z28 Twichy at full throttle within the Drivetrain forums, part of the LSx Technical Help Section category; I have a 99 Z28 with the 6 speed. At full throttle the rear of the car feels twichy, almost ...

  1. #1
    Junior Member
    Join Date
    Oct 2006
    Location
    US
    Posts
    25

    Silver
    99 Z-28

    Rear of 99 Z28 Twichy at full throttle

    I have a 99 Z28 with the 6 speed.

    At full throttle the rear of the car feels twichy, almost like a movement from one side to the other. Anyone else seen this?

    Seems really bad from third gear up. Car runs fine, just seems a bit loose.

    83K miles, original shocks.

  2. #2
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
    Join Date
    Oct 2006
    Location
    doylestown, Pa
    Posts
    6,818

    SILVER
    2004 CTS-V

    Mine is twitchy 1st and 2nd! But my rear is shot!

  3. #3
    Member Fastcar's Avatar
    Join Date
    Dec 2005
    Location
    Jersey Boy
    Posts
    316

    Dark blue metallic
    2000 TransAm

    Quote Originally Posted by thende2617 View Post
    I have a 99 Z28 with the 6 speed.

    At full throttle the rear of the car feels twichy, almost like a movement from one side to the other. Anyone else seen this?

    Seems really bad from third gear up. Car runs fine, just seems a bit loose.

    83K miles, original shocks.
    More info please! What suspension work / replacement parts have you done? If you still have the original shocks, they're pretty much shot at this point. And, judging from that fact, it doesn't sound like you've done too much suspension work at all.

  4. #4
    Junior Member
    Join Date
    Oct 2006
    Location
    US
    Posts
    25

    Silver
    99 Z-28

    Additional data, completly stock, nothing has been changed. I figured shocks would also be in order. I bought some KYB G-2's on sale for $23.00. I was told from tirerack they are similar to stock.

  5. #5
    Senior Member Danger731's Avatar
    Join Date
    Aug 2000
    Location
    Indy
    Posts
    6,712
    lug nuts

  6. #6
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
    Join Date
    Oct 2006
    Location
    doylestown, Pa
    Posts
    6,818

    SILVER
    2004 CTS-V

    Quote Originally Posted by Danger731 View Post
    lug nuts
    I hope the lug nuts ain't loose!

  7. #7
    The Bandit Wesman's Avatar
    Join Date
    Apr 2006
    Location
    NJ
    Posts
    4,033

    SGM
    1998 Trans Am WS6

    Check all the rear suspension components.

    Trailing arms and bushings, sway bar bushings and end links, coil springs, shocks, panhard rod, and torque arm and mounts.

    If anything it worn or loose, replace it. That should tighten up the rear end nicely.

  8. #8
    Junior Member
    Join Date
    Oct 2006
    Location
    US
    Posts
    25

    Silver
    99 Z-28

    Pulled the shocks and they were in great shape, which amazed me. Replaced Panhard Bar, had a new one, replaced torque arm bushing with energy suspension piece. Have not tested, but all looked good and tight.

  9. #9
    Member Fastcar's Avatar
    Join Date
    Dec 2005
    Location
    Jersey Boy
    Posts
    316

    Dark blue metallic
    2000 TransAm

    It's impossible to tell if a shock's internal valving is worn by looking at it. You can see obvious signs of seal failure by seeing if there's shock fluid on the body of the shock. Are the bushings on the lower control arms good also? It's inexpensive enough to replace the LCAs with better aftermarket parts that have greasable poly bushings. Are the sway bar body bushings and end links good?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help: Bogging at full throttle after headers
    By davidz28 in forum External Engine
    Replies: 31
    Last Post: 04-23-2011, 06:50 AM
  2. Full Throttle and A/C
    By aerojt in forum Camaro / SS
    Replies: 17
    Last Post: 08-27-2008, 04:22 PM
  3. full throttle shift issue
    By hondakilla98 in forum Automatic Transmission
    Replies: 2
    Last Post: 10-16-2006, 11:08 AM
  4. Full Throttle Growling
    By 98Z-28Camaro in forum General Help
    Replies: 4
    Last Post: 06-15-2006, 02:54 PM
  5. Tranny noise on full throttle
    By cchris1109 in forum Drivetrain
    Replies: 1
    Last Post: 01-01-2006, 02:54 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •