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1987 rear vibration at 58 to 64 mph, the vibration is

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1987 rear vibration at...

1987 rear vibration at 58 to 64 mph, the vibration is intermittent . I balanced the driveshaft, half shafts,new u joints,wheel bearings,tried different wheels and tires. The only difference with the different wheels,

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

The other wheels were wider, and the vibration moved to a higher speed

Submitted: 2 years ago.Category: Classic Car
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Answered in 2 hours by:
2/15/2016
Classic Car Mechanic: Roy Belding, Classic Car Mechanic replied 2 years ago
Roy Belding
Roy Belding, Classic Car Mechanic
Category: Classic Car
Satisfied Customers: 7,453
Experience: Grew up with most of the 50,60 and 70 high performance cars
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good evening my name is ***** ***** I will assist

what make and model and trans????

Roy

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Customer reply replied 2 years ago
4L60E Chevrelot.
Classic Car Mechanic: Roy Belding, Classic Car Mechanic replied 2 years ago

electronic trans in an 87??? what model truck??

Roy

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Customer reply replied 2 years ago
It's in a*****Rod. It's an LT1 with a 4L60E transmission with 1987 corvette rear end suspension.
Classic Car Mechanic: Roy Belding, Classic Car Mechanic replied 2 years ago

wish you would have posted that in your original post. working blind up to this point

what size wheels are you using front and back??

Roy

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Customer reply replied 2 years ago
Rims are 16 x 7. Tires are 225/60x16. Out of curiosity, I tried 8-1/2 x 17 wheels with 285/40x17 tires and the vibration went from 58 to 64 mph to 68 and up mph.
Classic Car Mechanic: Roy Belding, Classic Car Mechanic replied 2 years ago

did you have the alignment checked to be sure the front and back are square with each other??

the different wheel speeds with different tires and wheels is definitely a contributing factor to this.

Roy

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Customer reply replied 2 years ago
it was the first thing I did.
Classic Car Mechanic: Roy Belding, Classic Car Mechanic replied 2 years ago

I am not a wheel and tire expert for matching like this but you need to get the right combo to get this resolved. I will opt out to see if anybody else can help

Roy

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Customer reply replied 2 years ago
Stop now unless this is covered under my question. I am not authorizing additional charges. Thank you.
Classic Car Mechanic: Steve, Classic Car Owner replied 2 years ago
Steve
Steve, Classic Car Owner
Category: Classic Car
Satisfied Customers: 3,487
Experience: Owner of classic cars with knowledge of many older brands. has been my hobby/interest since before I was even driving.
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You should not get charged any additional if you continue with this question. Any billing inquires should be addressed by customer service, experts are basically sub contractors here.

With that being said your issue sounds like the pinon angle is off. This will cause a vibration and the different size tires changed rotational speed which changes when the vibration comes in. the same thing would happen with a gear ratio change.

This link should take you to a page that will help explain how to set proper pinion angle/driveshaft angle.

http://www.hotrodhotline.com/md/html/drive_shaft_harmonics.php

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Customer reply replied 2 years ago
My rear end has fixed differentIal. I have 3 degre down angle on the transmission, and 3 degre up on the rear end. I also put a constant velocity double universal Joynt in the driveshaft. I was told if there was something out of alignment, that this would correct the problem, lt did not.
Classic Car Mechanic: Steve, Classic Car Owner replied 2 years ago

Did the double u-joint set up change the vibration at all?

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Customer reply replied 2 years ago
No.
Classic Car Mechanic: Steve, Classic Car Owner replied 2 years ago

You said this is intermittent, if you have manual control of the torque converter lock up. Will you get this vibration when the converter is unlocked also?

Driveshaft angle seems to be on the high side but is within reason.

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Customer reply replied 2 years ago
If I do have manual control of the torque converter, I don't know how to do it.
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