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Old 12-31-2006, 12:47 PM
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driveline vibration when you decelerate

I have a 47 ford streetrod with a 302 ford engine and a ford overdrive transmission. I have a driveline vibration when I let off the gas at around 2600 RPMS. You can feel this vibration in the floorboard in the middle of the car. I have a new balanced driveshaft,new fod trans, new yokes, new u-joints and a new 3:08 ring and pinion all set up by a pro rod shop. Motor mounts are good wheels are balanced but I still get this resonant sounding vibration when I let off the gas. If you are giving the car gas there is no vibration. Pinion angle is set on 3 degrees where they say it should be. Can anybody give me some ideas or suggestions on this problem. THANKS

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Old 12-31-2006, 02:38 PM
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Check driveshaft and pinion angle. The correct expression is "included angle" which combines the angle of the slip yoke and the pinion yoke angle. Try this site. I am sure there are others....

http://www.2quicknovas.com/happypinions.html
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Old 12-31-2006, 03:56 PM
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In a leaf spring car when you get off the gas the pinion angle will increase.

Some assembly line cars had weights bolted to the tailhousing of the transmisson to change the harmonics for noise/vibration/harshness compliance.

If you think back, the 66-67 Fairlane convertibles had a vibration canister in the rear quarters to stop drivetrain harmonics in the body as well as bump shudder.

Who knows what we hot rodders can create?

I have a honey of a problem now. Everything from the AC condenser clear through the entire engine, trans, driveline, front and rear suspensions, and wheels and tires have been changed. 100 % Everything but the rear axle housing.

And I still have the same vibration I had with the other engine, trans, driveshaft, etc... When I get the urge I am going to try the counterweights.
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Old 01-01-2007, 02:42 PM
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vibration

Hi,i had that same vibration problem. i tried everything to correct it,then an old mechanic told me to take 2 hose clamps,large enough to go around the center of the driveshaft, put the screw end side by side. mark a line with a magic marker.beside the screw end, drive the car,if you still have the vibration,stop,move both clamps 1 inch,tighten and try again. keep moving clamp heavy end around until vibration is gone. if vibration gets worse with 2 clamps,remove one and keep trying. im boatbob2
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Old 01-01-2007, 06:42 PM
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Quote:
Originally Posted by boatbob2
Hi,i had that same vibration problem. i tried everything to correct it,then an old mechanic told me to take 2 hose clamps,large enough to go around the center of the driveshaft, put the screw end side by side. mark a line with a magic marker.beside the screw end, drive the car,if you still have the vibration,stop,move both clamps 1 inch,tighten and try again. keep moving clamp heavy end around until vibration is gone. if vibration gets worse with 2 clamps,remove one and keep trying. im boatbob2
Jerry's problem is from # 1 = "I still get this resonant sounding vibration when I let off the gas."

Mine has a completely new, custom made, fully balanced driveshaft.

???????
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