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Ecklers AutoMotive
Username Post: vibration in floor        (Topic#353256)
Posts: 39

Loc: washington state
Reg: 12-23-16
10-01-18 10:30 AM - Post#2747615    

feeling some vibration through the floor and gas pedal at highway speeds (60+) I don't feel it in the steering wheel or see any side mirror vibration. wondering if it could be a drive line out of balance or maybe u joints?

Ecklers AutoMotive
Valued Contributor
Posts: 3781
Loc: Possums Crotch, KY
Reg: 06-26-07
10-01-18 05:34 PM - Post#2747650    
    In response to jrhopkins

I'd also check your motor mounts.


Posts: 795
Reg: 12-09-07
10-01-18 05:45 PM - Post#2747653    
    In response to jrhopkins

Lots of possibilities. Bad tire balance or even a shifted/broken belt in the tire. Bad U joints/carrier bearing. I have seen a bad drum cause a nasty vibration too. Rear axle bearings. Just have to do a lot of narrowing down. Personally I like to start with the options that do not cost any money first. Swapping tires/brake drums, checking u joints, carrier bearing, motor & trans mounts.

1958 Impala 2dr Hardtop Under Construction
1966 Chevelle Malibu Convert M20/350 Aztec Bronze
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Posts: 39

Loc: washington state
Reg: 12-23-16
10-09-18 08:12 PM - Post#2748289    
    In response to ragtp66

going to start with the tires. rotate rear to front( radials) and see if that helps. I also thought maybe motor mounts. car was restored about 10 years ago and a 350 installed but don't know if the mounts were the same or replaced.

"9th Year" Silver Supporting Member
Posts: 356
Loc: Chicago
Reg: 01-03-13
10-19-18 08:52 AM - Post#2749045    
    In response to jrhopkins

Sorry for the late reply here.

I'm going to suggest the center drive shaft bearing be checked. Common problem with X-frame cars with the two-piece drive shaft. The bearing is held in its support housing by a rubber ring to insulate vibrations, and that rubber can deteriorate with decades of use/age.

You say a 350 engine was installed in the past, and I would assume a more modern transmission also. The new trans probably required shortening the drive shaft, which changes the drive shaft geometry a little, may add to the chances of vibration.

An aftermarket center bearing is available from all the usual vendors, and not too difficult to replace. The bearing is pressed on, so that step would require taking the drive shaft to a shop that can handle that. And they can also check the shaft for out-of-balance.

Ecklers AutoMotive
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