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Old 11-08-2018, 11:32 AM   #1
Maggiolone
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Default M47 Conversion: noise reduction

Just completed the conversion from 3sp auto to M47 on my 245.

Car drives fantastic, shifts smooth.

But there's a whine, almost electronic, not unlike an alternator, that increases with RPMs. It's loud in 3rd and 4th gears, and almost disappears in OD.

Once I'm out of OD, the whur/whine returns.

I think I need more insulation?

Is there a foam block kit that assists this?

Or should I run a different gear oil?

Or, am I screwed?
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Old 11-08-2018, 11:42 AM   #2
Redwood Chair
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An M47 is a straight 5 speed no OD.
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Folks on here don't know a good deal when they see it.
how psi stock cna support?

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Old 11-08-2018, 11:46 AM   #3
Maggiolone
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An M47 is a straight 5 speed no OD.
Oops. Sorry. M46. New to this.
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Old 11-08-2018, 11:52 AM   #4
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Strange 4th is 1:1 or straight thru the box so there shouldn't be 'gear' noise in 4th.
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Old 11-08-2018, 12:01 PM   #5
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Two things (which don't address the root cause)
1) if you don't have the fitted OEM foam block that fits inside the shifter hole - just get a cheap foam car-washing sponge and cut a small hole in it, then stuff that down into the gap between the trans and body. Less heat, less noise.
2) I made the T5 in my wagon (not the same thing at all, of course) quite noticeably quieter by changing the shift knob from a solid hard plastic round knob to a leather-wrapped knob with a little sound deadening inside. The stick vibrates, but the knob is one of the ways that vibration gets turned into noise inside the car.
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Old 11-08-2018, 01:01 PM   #6
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It could be the OD clutch bearing. When OD is engaged, the clutch is pulled against the brake ring and it stops spinning.

I have the foam shifter seal in stock.

http://forums.turbobricks.com/showthread.php?t=307928
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Old 11-09-2018, 12:45 PM   #7
Maggiolone
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I created a video of the trans noise at speed. It's that synthetic-sounding noise. https://youtu.be/VFoikXw1l58
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Old 11-09-2018, 07:01 PM   #8
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Yeah that sounds rough. Hard for me to tell really where it's coming from. Hope someone else has some insight for you.
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Old 11-12-2018, 05:38 PM   #9
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Quote:
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Yeah that sounds rough. Hard for me to tell really where it's coming from. Hope someone else has some insight for you.
I'm thinking it's a bearing
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