Loud thud at 55mph and 1500rpm
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Loud thud at 55mph and 1500rpm
Hi all,
I recently bought a 2003 blazer with 103k miles. I’ve been driving it for about the last month and yesterday noticed an interesting issues. When staying at a constant speed of 55mph at 1500 rpms I feel random loud thuds almost like someone rear ended me slightly. The rpms do not change when this occurs and no loss of power felt. It happened 5 times during my 8 mile freeway commute. It’s a similar feeling to when my rear diff would thud upon coming to a stop in my previous car.
The car shifts fine and the only way I have found to replicate the problem is getting up to 55mph at 1500rpm.
Any pointers here would be greatly appreciated!
I recently bought a 2003 blazer with 103k miles. I’ve been driving it for about the last month and yesterday noticed an interesting issues. When staying at a constant speed of 55mph at 1500 rpms I feel random loud thuds almost like someone rear ended me slightly. The rpms do not change when this occurs and no loss of power felt. It happened 5 times during my 8 mile freeway commute. It’s a similar feeling to when my rear diff would thud upon coming to a stop in my previous car.
The car shifts fine and the only way I have found to replicate the problem is getting up to 55mph at 1500rpm.
Any pointers here would be greatly appreciated!
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Joined: Oct 2014
Posts: 4,340
From: North Central Indiana
Hi all,
I recently bought a 2003 blazer with 103k miles. I’ve been driving it for about the last month and yesterday noticed an interesting issues. When staying at a constant speed of 55mph at 1500 rpms I feel random loud thuds almost like someone rear ended me slightly. The rpms do not change when this occurs and no loss of power felt. It happened 5 times during my 8 mile freeway commute. It’s a similar feeling to when my rear diff would thud upon coming to a stop in my previous car.
The car shifts fine and the only way I have found to replicate the problem is getting up to 55mph at 1500rpm.
Any pointers here would be greatly appreciated!
I recently bought a 2003 blazer with 103k miles. I’ve been driving it for about the last month and yesterday noticed an interesting issues. When staying at a constant speed of 55mph at 1500 rpms I feel random loud thuds almost like someone rear ended me slightly. The rpms do not change when this occurs and no loss of power felt. It happened 5 times during my 8 mile freeway commute. It’s a similar feeling to when my rear diff would thud upon coming to a stop in my previous car.
The car shifts fine and the only way I have found to replicate the problem is getting up to 55mph at 1500rpm.
Any pointers here would be greatly appreciated!
I had such an occasional hiccup in my giddy-up like you described for several months a couple of years ago at 55mph steady speed with TCC locked in, but I could see it my tach bounce a bit when it happened. Mine ended up with 3-4 clutches shredded on a 200 mile trip. Had trans fixed - hasn't done it since. Don't know about yours - or even if it could be same problem. Does it get worse the longer that you drive it?
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