When I shift my transmission into gear, there is a loud metallic clunk and the vehicle jumps forward or backwards. What could be the problem? Thanks

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"You know a car is really yours when you've touched every fastener on it." -David Freiburger

What speed is your engine running when you notice this?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Not even moving...when shifting from park or neutral.

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"You know a car is really yours when you've touched every fastener on it." -David Freiburger

Re-read my question to you and try answering again, please.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

What RPM is the engine at(hopefully at idle?), not vehicle speed.

EDIT: Jinx dan!

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72 dart acquired 12/08 /6,holley2b, mopar perf intake, mopar perf header, cam, built motor,904 finally re-installed, 8.75....still needs sorting out.
99 dakota 318 5 speed reg cab picked up 9/09; Trans finally fixed! woohoo!

Sorry...500rpm, the stated idle speed in the factory service manual.

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"You know a car is really yours when you've touched every fastener on it." -David Freiburger

I was thinking maybe we were talking about a situation where the engine was running on the fast-idle cam after a cold start; under that condition a hard engagement is normal. But if you're getting a lurch/bang even when the engine's warm, at that very low idle speed, then something's the matter — I'm thinking a possible problem in your torque converter.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I pulled the driveshaft out and the bang went away and I also noticed that the transmission yoke spins in neutral. Is this normal?

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"You know a car is really yours when you've touched every fastener on it." -David Freiburger