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09-23-2012, 09:35 AM | #1 |
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Join Date: May 2010
Location: va
Posts: 138
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a vibration problem at 40 mph
i have a vibration at 40 mph that i just can't find the cause of.i have had severial motors put in and out of the car,rebuilt the transmition,rebuilt the front end,rebuilt the steering all the way through.all of this work has not done any good at solving the vibration problem.all that is left is to remove the rear end and start rebuilding from top to bottlem but before i do that i want to run it by you guys to get your opinion.there is no noise at all from the rear end.it all apears good except the rear axel keyseats are a bit lose but i keep the rear drums tight to prevent anymore wear.i just don't think the vibration is found there.i did put in a new universal jount when i overhauled the transmition however from that point back i have not touched anything.what is the runout spec.on the driveshaft if i decide to take it out and check it?
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09-23-2012, 09:42 AM | #2 |
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Location: Kalamazoo
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Re: a vibration problem at 40 mph
tires balanced?
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09-23-2012, 09:47 AM | #3 |
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Location: Marietta GA.
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Re: a vibration problem at 40 mph
On my 31 coupe I have a vib. at about 40 mph, if I stay at 38 or go a little over 40 it will smooth out, It also depends on the slope of the road, no vib. on a slight up hill grade, but the vib. comes back with a slight down hill grade. stright and level is ok, but I still have to stay below 40 or above 40.
Have you drove another "A" model to compare?...I think there is some vib. in all of them due to the 4 cly. motor of the 20's and 30', JMO
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09-23-2012, 10:08 AM | #4 |
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Location: va
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Re: a vibration problem at 40 mph
i have tryed too balance the tires.it seems to be coming fron the drivetrain and not the tires.
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09-23-2012, 10:37 AM | #5 |
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Location: Eastern Canada NB
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Re: a vibration problem at 40 mph
My 30 coupe is exactly the same...all new except the rear end
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09-23-2012, 10:47 AM | #6 |
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Join Date: Aug 2012
Location: VIRGINIA
Posts: 28
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Re: a vibration problem at 40 mph
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09-23-2012, 10:48 AM | #7 |
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Join Date: Aug 2012
Location: VIRGINIA
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Re: a vibration problem at 40 mph
if u can fell the vibration going front to back is the driveshaft ..
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09-23-2012, 11:24 AM | #8 |
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Location: on the Littlefield
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Re: a vibration problem at 40 mph
You could take off the speedometer "turtle" and look for movement and play in the front driveshaft bearing ---have you run the car with the wheels off the ground, perhaps on a lift and looked for the vibration
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09-23-2012, 11:45 AM | #9 |
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Location: va
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Re: a vibration problem at 40 mph
i am going to jack the rearend up tommorrow and get it up to 40 mph and see what i can find.i may also take the rear wheels off to eleminate that being the problem.so far i think it is the drive shaft but i would like too get more input from you guy,s.
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09-23-2012, 12:00 PM | #10 |
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Location: Daytona Beach, Fl & Spencer, W. Va,
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Re: a vibration problem at 40 mph
Steamgas ..............
If you push in the clutch at 40 mph and it doesn't stop, it is, probably your tires or driveshaft componants. MIKE |
09-23-2012, 01:16 PM | #11 |
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Join Date: May 2010
Location: va
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Re: a vibration problem at 40 mph
i just jacked up the rear end and ran the speed up to 50 mph and pushed in the clutch and tried too tell the differance between the drivetrian and the wheels.the wheels are out of round and do wobble a bit but the vibration is coming from the drivetrian.i know how too square up the flywheel housing(.005)and the flywheel(.003).all things point too the driveshaft.i may take the speedometer out tommorrow and look for endplay there before i take everything out from underneath it.
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09-23-2012, 01:18 PM | #12 |
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Join Date: May 2010
Location: va
Posts: 138
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Re: a vibration problem at 40 mph
this is a 1929 truck.which bearing do you mean?the one at the transmisson or the one at the banjo housing?
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09-23-2012, 01:10 PM | #13 |
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Location: NC
Posts: 2,975
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Re: a vibration problem at 40 mph
Do you have the bearing and race in the torque tube.
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09-23-2012, 01:29 PM | #14 |
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Location: London England
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Re: a vibration problem at 40 mph
I think George means the one inside the front of the torque tube !!
John Cochran |
09-23-2012, 04:00 PM | #15 |
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Re: a vibration problem at 40 mph
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09-23-2012, 01:40 PM | #16 |
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Location: Jordan, MN
Posts: 1,411
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Re: a vibration problem at 40 mph
Most Model A's have a vibration at this speed. I lightened and balanced the flywheel many years ago and it helped but still has a bit between 42 and 45mph. I have driven many A's with the same vibration around this speed/rpm. Some are worse than others.
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09-23-2012, 02:42 PM | #17 |
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Location: Clinton,WA/Whidbey Island
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Re: a vibration problem at 40 mph
As long as the wheels don't fall off go past the post office.!! Have Fun!!!
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09-23-2012, 02:45 PM | #18 |
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Location: OKC / Tonkawa, Ok.
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Re: a vibration problem at 40 mph
My coupe did the same thing until I replaced the clutch and flywheel with a balanced and lightend flywheel. Yes it stll vibrates but at higher speeds 50-55. I typicaly drive 45 max.
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09-23-2012, 10:27 PM | #19 |
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Join Date: Nov 2011
Location: B.C. Canada
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Re: a vibration problem at 40 mph
A friends car had a bad vibration over 35 mph.The problem was that the inner ball cap around U-joint was not installed.Front of TTwas free to jump up & down & DS moved forward enough to knock out the brg stop on trans case & required another case to repair.
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