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Old 06-25-2021, 04:50 PM   #251
Harlard
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yes
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Quote:
Originally Posted by t8fanning View Post
My knob has a big chunk of steel on it
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Old 06-26-2021, 02:47 PM   #252
DavePolyakov
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I'm assuming the only adjustment would be through an adjustable panhard bar? I'm almost sure my driveshaft angles in the vertical plane are properly set to have no vibration. Pretty sure there is a compound angle and the horizontal angles are not proper.
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Old 06-26-2021, 03:34 PM   #253
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Your pinion gear is offset and the axle tubes are the same length. Not a whole lot you can do about that.
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Old 06-26-2021, 08:21 PM   #254
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Right. So there is no solution?
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Old 06-26-2021, 09:10 PM   #255
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Just get it as close to spec as possible.
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Old 06-27-2021, 02:10 AM   #256
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So it won't be in spec...
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Old 06-27-2021, 02:39 AM   #257
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I would do some more Google research on automotive NVH diagnosis.

It looks like there are some apps available for NVH diag.

Or maybe try a mechanical instrument like a vibrating reed frequency meter to get some measurements.



Quote:
Originally Posted by DavePolyakov View Post
... it is happening at idle?, so it's not my driveshaft angles. The sound is a pretty deep reverberation that fills the cabin around 2-2.5k RPMs.
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Old 07-01-2021, 10:28 AM   #258
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Was intrigued to find this thread after struggling with the rattle trap T5 in my 740 for almost 4 years now. My setup is a balanced squirter B230FT with ebay rods, IPD turbo cam , Yoshifab 16 lb whywheel, v6 T5 with fox body input shaft and Camaro tail shaft. Modified two piece driveshaft with standard slip yoke.

The swap was done when the car was basically stock, with the stock dog dish flywheel there was very minimal rattle. Once installing the new motor with the light flywheel the problem got much worse.

One thing to note: 240s and 740s have some sort of driveline dampening on manual transmission cars( ie giubo or rubber coupled rear shaft) With a T5 swap the lack of any damping allows for engine harmonics to resonate in the driveline. Others have posted some success with heavy ford damper yokes which supports this theory.
I've always wanted to try a Cadillac CTSV giubo joint on the back of the transmission. My thought is drastically reducing the ability to transfer vibration to the driveshaft will eliminate the rattle. The issue is where to find a T5 yoke that will work, custom made is probably the only option. If anyone knows where I can get a custom yoke made please share.
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Old 07-01-2021, 10:51 AM   #259
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I wound up using that heavy slip yoke with a 1330 to 1310 conversion u-joint and a bunch of spacers to get everything lined up properly. Shortening the torque rods to their absolute limit got me just within spec for operating angles. The car is now, to use tfrasca's words, downright tolerable. It was not cheap: F6ZZ-4841-BA.











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Old 07-01-2021, 05:52 PM   #260
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Thanks for the update man! Gotta dig one of those yoke's up...
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