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Drivetrain rattle / bucking ?

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  • Drivetrain rattle / bucking ?

    The car had a rattle, gets louder the more I let out the clutch. It also bucks like a bronco...I didn't have this problem before, and a lot has changed since my last joy ride around the neighborhood.

    Built 355, T5, 2.73 rear, stock cross member and torque arm, nothing after the Hooker 2055 y-pipe, stock mounts - no problems

    Same motor, same trans, UMI cross member/torque arm setup with driveshaft loop, 3.42 gear, full catback exhaust, poly trans mount - big problems.

    I just installed poly motor mounts, raised the motor about 3/8". It helped to move the passenger side header ball flange away from the rear a-arm mount but only a 1/4" at most. Same problems. I'm betting that the bucking has to do more with the gear change, but the rattle is pissing me off. It sounds like it's coming from the passenger side near the rear of the motor.

    Ideas? I will be rechecking the pinion angle again although I'm fairly certain it is right at -2*. The aluminum DS was hitting the loop so I used the hydraulic ram to move it over a bit and I put the steel one back in for now.

    1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
    1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
    1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

    2006 Saab 9-7x 5.3i Daily Driver

  • #2
    Should not have anything to do with the gear change unless something was left loose.

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    • #3
      i was gonna say maybe gear change or it the dshaft hitting.
      91 Trans am, 305, Lt1 cam, 24lb injectors, headers, SLP LM2, SW chassis, massive panhard, lowered, modded TPI, Tuned, 4.10s, Lincoln locked
      85 Z28 406/th400?/3.42 4th gen disc rear/4th gen dash
      00 Tahoe Z71........Stock
      97 K1500 lt4 cam, 1.6s, MPFI, Solid axled, IROKs,------winter beater

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      • #4
        I think the bucking issue is just from low RPM surging, might be able to tune it out. I'll double check the LCA's and such

        The rattle has me worried though. I really don't want to pull the trans to check the pressure plate bolts

        1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
        1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
        1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

        2006 Saab 9-7x 5.3i Daily Driver

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