Thump Thump Thump coming from rear when Hard Accelerating in 1st
When I hammer on the gas in first gear I hear and feel a thumping (thump thump thump) coming from the back of my car. It only happens if you accelerate fastand only in first gear. Could it be the rear diff? or u joint??
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Transmission mounts are worn out and most likely your motor mounts too. Pretty straight forward job to replace but sometimes the bolts holding the motor mounts will be stuck requiring an impact wrench. Problem is that there is no room to get the impact near these bolts making a lift necessary.
When was the last time you had your rear differential looked at or serviced? Basically when its happening something in your drive train is out of whack, so to fix it we need to look at the sequence of where the power goes, but if it sounds like its coming from the back,we'll start at the drive shaft itself, when it spins, it gives power to the rear differential, which is most likely where the noise is coming from. Driving should be limited while this problem is occurring because if any of the gears in the rear diff have become shaved or broken, the problem could get much worse while spinning with the pieces of gear are spinning around inside the still working gears. The first thing you should do is re-lubricate the gears in the rear, if this doesn't fix it, a trip to the shop is in order.
this is some what normal, as long as it just once that you hear the noise (ie. you turn the truck on and thump, turn the truck of and thump) the doors operate off of vacuum lines in the engine. When you shut the engine off the vacuum goes away and *thump* the blend door snaps back to its normal resting position. then when you turn the truck on the vacuum then comes back and *thump* the door snaps back to its adjusted place.
If you feel that this is not what is going on, this diagnostic technique can help eliminate this condition set the blend door to the hot side and start the truck and it should thump when the engine is on or off. if you didn't get a thumping noise that is good it just means that the blend door is set to the hot side normally open. .