Mechanic can't figure it out

Mechanic can't figure it out

Postby gobytrain [OP] » October 26th 2020, 9:05pm

My van is making a rotation sounding banging that starts at about 40mph, doesn't make the noise when I speed up, but makes the noise when I slow down. The mechanic thought it was some kind of engine mounts and changed those and now it's still making the noise plus some new noises. The noise happened after my transmission was replaced, but that may just be a coincidence? Thanks so much for reading!
Original Poster [OP]
gobytrain
Fueling (Empty tank)
Fueling (Empty tank)
Years of Membership: gobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full years
Posts: 8
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Joined: October 2013
Alias (AKA): gobytrain
Van Model Year: 2003
Van Make/Model: Chevrolet Astro
Extra Info: lt awd

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Re: Mechanic can't figure it out

Postby dcsleeper » October 26th 2020, 10:56pm

video?
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RandomInternetUser wrote:I blame stupidly-written 1970s and 1980s TV shows.
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Re: Mechanic can't figure it out

Postby gobytrain [OP] » October 26th 2020, 11:13pm

I'll see if I can capture the sound, thank you!
Original Poster [OP]
gobytrain
Fueling (Empty tank)
Fueling (Empty tank)
Years of Membership: gobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full yearsgobytrain has been a member for 7 full years
Posts: 8
Topics: 4
Joined: October 2013
Alias (AKA): gobytrain
Van Model Year: 2003
Van Make/Model: Chevrolet Astro
Extra Info: lt awd

Re: Mechanic can't figure it out

Postby Rod's Trucks » October 27th 2020, 12:35am

My quick guess, could be a drive line issue.
It certainly could have been related to the transmission change ( but not necessarily caused by it). I would drop the drive line and look for a binding U-joint, or possibly a bad transmission output shaft bushing.

:pray:
Rod J
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