Re: 727 output shaft bearing worn? VIDEO
[Re: SportF]
#2719455
11/26/19 01:14 PM
11/26/19 01:14 PM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,237
North Central, Indiana
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That bushing isn't expensive and as said, have the driveshaft checked I had a new driveshaft built early this year and the run out was so bad that the vibration broke the output shaft housing.
72 Plymouth Roadrunner 11.08@123.25
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Re: 727 output shaft bearing worn? VIDEO
[Re: Nitrofish]
#2719456
11/26/19 01:17 PM
11/26/19 01:17 PM
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Joined: Aug 2003
Posts: 43,123 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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I've never seen or heard of a 727 output shaft moving like yours does Me thinks you have several problems now, not just one Sorry You need to get it fixed before it gets worst and hurts you or the car or both
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 727 output shaft bearing worn? VIDEO
[Re: SportF]
#2719458
11/26/19 01:24 PM
11/26/19 01:24 PM
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Joined: Dec 2005
Posts: 11,526 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,526
Fulton County, PA
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Output shaft bearing is a ball bearing, not really meant to control "wiggle". Just a support between the rear support and the tailshaft bushing. You can try a bushing, but I lean towards the shaft not being 100% right for a high frequency vehicle speed related "buzz".
Have it checked. BUT at 1:1 in high gear the shaft is spinning at engine speed (or near with an auto) At 80MPH, the shaft is spinning ~4000RPM, maybe, depending on the rear gear. Most shops can't spin them nearly that fast or hold a tight enough tolerance. I would do what I had to do to get it to someone who can do a high speed check and/or balance before tearing the whole car apart.
I've had a shaft that was built with one (or both) end slightly off center, .010-.015 maybe. It would balance up and be OK for awhile, but the buzz would slowly reappear over half a season at 7000+ RPM. Got tired of it, threw it in the scrap, got a new aluminum unit, problem solved. Smooth for years after that. A bad shaft is a time bomb.
Also, in my experience, if the rear bushing gets too loose (high mileage, etc.) it will allow the yoke to move around enough to create an oil leak at that seal. If there is no evidence of the yoke moving beyond what the seal can control (leak), I would look at the shaft. Also, had a shaft out of balance/off center far enough that the yoke was "whipping" or "wallowing" around in the bushing. Evidence of that was a bushing that looked like crap and a smear of bushing material on one side of the yoke surface.
Last edited by CMcAllister; 11/26/19 01:38 PM.
If the results don't match the theory, change the theory.
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