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1998 pontiac GP makes thuunk when put in reverse

3.8 v6 with automatic tranny. When ebging is running and idling, when you put it into reverse, it makes a "thunk" under the floorboard near the front of the console. I believ it could be a tranny mount?? Anyone else have any ideas what it could be?? BTW, i drove this car for 2 hours while test driving it and it did make that "thunk" The sales man warned me it would, but it didnt. When I went one last time to test drive it, it made the "thunking " noise.. if its a tranny mount, how could it be intermittant???

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It is the rear motor mount. If there is a load on the motor it will make the noise and if there isnt any loud on it it wont make it. They should put a new one on it and maybe they could sell the car faster. There is three motor mounts on this car , one on the frount of the motor and one near the fan and another on the trans in back of the motor.

Posted on Dec 02, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: motor mounts

99 tls have bad FRONT motor mounts could cause your problems and tcs light to come on

Posted on Jan 05, 2009

royhyreno9
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SOURCE: 91 Toyota Camry Transmission Trouble

first check transfluid for level,color,smell&metal shavings if its dark in color and smells burnt. look to change the trans. or if metal shavings also look to change trans if color is clear red flush trans then pull trans pan change filter refill with now toyota type trans fluid.

Posted on Jan 05, 2009

  • 653 Answers

SOURCE: 2006 Chevy Trailblazer loud thunk noise at start up

My first guess would be the front u-joint on the drive shaft. Try twisting the u-joint to see if there is any play, which there shouldn't be. If the u-joint is OK, have the transmission checked out at a reputable shop. There could be a problem with the torque converter, the valve body, or the bands. You didn't say whether this was a 4 wheel drive or not, but I doubt that the problem is with the transfer case. Let me know what you find.

Posted on Mar 10, 2009

asetech74
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SOURCE: 94 v6 camaro automatic.. no reverse or neutral.

Sounds like you may have burned out the reverse clutch pack inside the transmission by going from drive to reverse. I would recommend seeing a transmission shop for verification. Hope this helps

Posted on Mar 13, 2009

SOURCE: my 52 mini suddenly started making a whining

Check your transmission fluid level, as recommended in the Owner's Manual. Also, if your car is equipped with power steering, check the fluid level in the power steering reserve.

If all fluids are at recommended levels, see if you can locate the noise. If it is in the engine compartment, try to determine if the noise is coming from any of the serpentine belt pulleys.

Sometimes the bearings on air injector pumps fail in higher-mileage vehicles, first causing a "whining" noise, and ultimately resulting in the serpentine belt "chirping" or squealing on acceleration. Best you can do is make sure all fluids are at recommended levels, then try to pinpoint the source of the whining noise for further diagnosis.

Hope that's helpful!.

Posted on Jul 01, 2011

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