HELP! Clunk when taking off from stop - Chevy Impala Forums
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post #1 of (permalink) Old 1 Week Ago Thread Starter
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HELP! Clunk when taking off from stop

Hey guys I have a 2003 Impala Ls 3800 I’ve been working on the car since I got it.the car had a bad transmission when I first bought it I changed the transmission but the car was still clunking when taking off from a stop (it feel like somebody hit me from the rear)if I take off slow it won’t do it ... It’s clunks when accelerating from a stop or turning a low speeds... it’s not all the time tho it’s like it will clunks a couple times then will run fine until I cut car off and start it again... sometimes when I get off work and go home it won’t clunk at all ... now I replaced both axles (I DO need axle Seals), Lower Control Arms, passenger wheel hub, inner & outer tie rods, Engine & Transmission Mounts, Short Dog Bones & poly bushings, MAF & MAP Sensor, Cleaned ThrottleBody, new TPS Sensor, new PCV Valve & It STILL CLUNKS CAN ANYBODY FIGURE OUT WHAT IT MIGHT BE
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post #2 of (permalink) Old 1 Week Ago
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May check axle nut tightness.
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Check cradle bolts and bushings.
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post #4 of (permalink) Old 5 Days Ago
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Does it do this when starting out in Drive? Have you tried duplicating when starting out in 1?
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Preignition???
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The reason I posted what I did earlier is because in my '03 with the 3.4, the transmission will shudder/clunk/slip/toggle between go and slip sometimes when starting off in drive. When I pull the selector into 1 at the stop light, it starts out as normal. My self diagnosis was a flaky shift solenoid in the valve body. Which, for what a tranny runs, I'm willing to go semi stick shift till I have a more solid reason to pull the engine/tanny assy out. Which will be very difficult without a lift.

'03 3.4 with lots of miles, 230k+

Last edited by wz7u; 8 Hours Ago at 09:32 PM. Reason: Because I can
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post #7 of (permalink) Old 1 Hour Ago Thread Starter
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I tried what you said & it shifts fine like you said when I shift it to 1
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