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a dog
My 2000 Grand Prix would have a low-speed knocking noise coming from the drivers side as the CV axle was failing. The loss of lubrication in the CV Boots allows the joint to make a knocking/tapping sound at a low speed. If the knocking is coming from the engine compartment, then it could be an entirely different problem.
A other small child
have you tried higher octane fuel?
Change you top strut nut.
Bad CV joint, loose rim, Loose caliper
are you sure the noise is coming from the transmission. most cars will make a knocking sound due to the lifters being a little stuck. to see if it is a lifter noise, at the net oil change use a qt of lucas oils. there will be one that says something about lifter noises on the front, found at any parts store
Mine was making a knocking sound and I filled it up with premium gas. Sounds crazy but it actually stopped the valves from chattering. Might try it on your next fill up. 93 Octane.
possibly hitting the front bumper
Worn Ball Joint
it makes a knocking sound when u turn the wheels.
The engines timing could be advanced to much. If it's a front wheel drive a CV joint could be going bad. Knowing a more precise area of where the sound is coming from might help to identify the problem.