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Post by stretch on May 16, 2016 9:35:00 GMT -5
What kind of wheels do you have? Magnum wheels can not be accurately spin balanced without a adapter plate that uses the lugs to locate the wheel on the machine. The way the wheels are made makes it impossible to center the wheel on the balancer with the standard cones used on todays wheels. Do you feel it in the seat or the steering wheel? Seat points to the rear, steering wheel pints to the front.
Does the car have an 8 3/4 in it? Improper wheel bearing/ axle preload settings can cause a vibration at speed. The bearing preload is set on the right side only. I have seen cars with this type of vibration because a left side non adjustable axle bearing set up was on both sides.
Does the vibration go away if you put the car in neutral and let it coast? Does it come back if the car is coasting, still in neutral and you bring the engine RPM back up to the RPM at vehicle speed.
Answering these simple questions will help pinpoint where to look.
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Post by brbluesman on May 23, 2017 14:19:07 GMT -5
Had the driveshaft balanced but it wasn't out much. Still same vibration between 60-70. Had the wheels balanced again too, no help. Just can't find the culprit to this annoying problem.
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Post by brbluesman on Dec 19, 2017 2:17:09 GMT -5
Ok, just a thought to help answer my own question...I pulled out my 440 and completely rebuilt her with all the recommendations from 440source.com for making the engine more stock than I currently had it. Another reason was so that I could also install some Classic Air this year. With the rebuild process I had my motor balanced. I'm wondering at this point, since the configuration I had prior wasn't very efficiently working together, could balancing the engine and tuning it to run as it came from the factory, make a difference with the vibe in the rear end? Just a thought, and I'll find out soon since the engine is in now and the exhaust and interior will be done soon. She'll be on the road again !
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Post by brbluesman on Feb 23, 2018 11:34:06 GMT -5
Well, it's like another Curse of Oak Island episode ! Another hit and miss ! The engine is now back in and runs like a top. No vibration at all from it and runs like the day it was born, but the rear? vibration is still there at 65-70 mpg. Not sure what else I can do now except get a new rear end ? Another thought is, could it possible be coming from the transmission ?
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,157
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Post by DynoDave on Feb 23, 2018 21:08:17 GMT -5
Yes, I think so. Especially the output shaft bushing. If you can grab the prop at the tail of the trans and move it up and down "excessively", that will certainly cause a vibration, though I've more often seen it at low speed on accel. But still free and easy to check. And I don't think terribly expensive to replace.
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Post by brbluesman on Mar 2, 2018 10:16:25 GMT -5
Ok, thanks, DD ! I'll check it this weekend ! I thought of one other thing I didn't check - how square is the frame. Could that be a contributor also?
Picking up my car tomorrow from having AC installed ! Then I start putting the interior back in to get ready for the BEMA show on the 17th. Since the vibration is only at 65-70 and I don't stay in between those speeds often, I can always drive her, but it would be great curing this issue once and for all. Thanks for all the help, everyone.
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Post by Charlie on Jan 21, 2021 1:02:20 GMT -5
I had the 2-piece driveshaft recently balanced on my 77 F-150, and it made a very noticeable difference! Those shops are far and few between. The guy told me that if it's a little bit out of balance, over time it gets worse from use. Mine had a little bit of Ziebart on it, and he figured that's what got it started. He cleaned it, balanced it, installed a new carrier bearing and it was like a new truck!
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