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Old 05-01-2013, 09:59 PM   #1
29tudorsedan
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Default How loud is too loud for gears?

Would you guys mind giving this a listen? I'm not sure if first and second are abnormally loud, and what steps should be taken if they are. Thanks!

http://youtu.be/fET_fwNCKow
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Old 05-01-2013, 10:08 PM   #2
Special Coupe Frank
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Default Re: How loud is too loud for gears?

I've only driven one A - my coupe in the avatar, and its first and second are pretty loud, maybe not quite as loud as yours.

Generally speaking, you should hear some whine from the straight-cut gears, but no other "rockiness"...

My opinion is that the needle bearings on the countershafts are worn.

At any rate, the tranny should probably be opened-up and checked-out.

Any idea what gear lube is in it?
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Old 05-01-2013, 10:10 PM   #3
29tudorsedan
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Default Re: How loud is too loud for gears?

Not sure, I haven't changed fluids in it since I've owned it, what would you/do you go with?
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Old 05-01-2013, 10:29 PM   #4
Peter J
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Default Re: How loud is too loud for gears?

Lots of folks use what's called 600W (not weight) gear oil. You can get it through most the suppliers. Some folks use a mix of gear oil and STP. I'm presently using 85-140 and frankly can't tell the difference althought others say they can. You might want to flush it with diesel and see what comes out the bottom (metal chunks?) and refill with your choice up to the bottom of the filler hole.
Hope this helps a little,
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Old 05-01-2013, 10:48 PM   #5
Chuck Sea/Tac
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Default Re: How loud is too loud for gears?

Have you checked the oil level? I agree a whine is normal(and cool) but your noise needs to be checked out. You will get several opinions on the type. It needs to be thick. Some use 600w ford originally used, others use different concoctions, I use straight 90/140 gear oil. Chuck
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Old 05-02-2013, 01:06 AM   #6
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Default Re: How loud is too loud for gears?

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Ours has a similar noise to yours in second only... although I would swear it's quieter now. We changed the oil a while back, and it's made it less "scary" sounding. It's not obtrusive, but noticably louder in second than 1st or 3rd.

Can't really offer an opinion on whether it'll grenade or not, but the right amount of the correct oil might help I got the 600W from Macs. I've heard the 600W is about the same viscosity as 250 weight gear oil, but can't verify that as fact.
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Old 05-02-2013, 07:18 AM   #7
Special Coupe Frank
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Default Re: How loud is too loud for gears?

For a first-step, I would recommend getting some true 600-weight gear oil, from someplace like Snyders, Brattons, or Bert's, driving the car around the neighborhood for 15 minutes or so ( going through the gears ) to warm the oil up, then draining whatever is in there now ( overnight, if you can), then re-filling with the 600-weight.

The original type heavy gear oil DOES make a difference in how the transmission shifts ( less clashing of gears ). It won't do much to silence worn bearings, but might quiet worn gears for a while.

I wouldn't worry too much about your tranny "grenading"... I've driven my A for 4 years / 8,000 miles with a growly transmission...

I would like it to be quiet, but at least it hasn't exploded or locked-up.
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Old 05-02-2013, 07:43 AM   #8
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Default Re: How loud is too loud for gears?

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Originally Posted by 29tudorsedan View Post
Not sure, I haven't changed fluids in it since I've owned it, what would you/do you go with?
get the fuid from the suppliers and change the trans and diff fluids. i dont quite understand why alot of individuals acquire a car and dont even go over the basics such as servicing the fluids. why take a risk of driving something that is low on fluid or has water in it and create more damage. it takes about 1/2 hr to do both
as mentioned change the fluids and drive it

Last edited by Mitch//pa; 05-02-2013 at 07:49 AM.
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Old 05-02-2013, 07:52 AM   #9
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Default Re: How loud is too loud for gears?

A friend of mine assembled a transmission with good used parts. Thus, all bearings and gears were checked out. However, the parts were from different transmissions and the gears had different wear patterns on them. Even though he tried to use the best looking gears and bearings, his transmission growled a lot like yours. If a transmission is rebuilt and old gears are reused, it it best to use a nice looking complete original set from a complete original transmission... that way the gears are worn together and have a nice mesh.
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Old 05-02-2013, 08:00 AM   #10
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Default Re: How loud is too loud for gears?

Doesn't sound too bad to me, sounds like a smooth whine...?? tough to hear on my laptop. I would definitely change out the fluid. While you're at it change out the rear end fluid as well. Wheel bearings should also be greased/packed periodically. I use Lucas products, get them at your local Napa store. Its great stuff, smoothed out my transmission and made for easier shifting.
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Old 05-02-2013, 09:22 AM   #11
Ron Lowe
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Default Re: How loud is too loud for gears?

When I bought my A, brought it home and checked the trans. and it was almost empty of fluid. Drain yours and flush it out good and fill with correct oil from the vendors. I think you'll be very surprised. Oh and don't forget the rear end.
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Old 05-02-2013, 09:35 AM   #12
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Default Re: How loud is too loud for gears?

Sounds like mine does and I had mine open last year and all looks well. It was nearly empty and "muddy" looking at first after probably 50 years since last service. Cleaned it out well and refilled.

That whine is (in my opinion) just the straight-cut gears. But I agree with those that say to clean out (rinse out with kerosene) and change the oil.
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Old 05-02-2013, 09:54 AM   #13
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Default Re: How loud is too loud for gears?

worn and pitted gears can cause a whine, etc....
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Old 05-02-2013, 11:20 AM   #14
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Default Re: How loud is too loud for gears?

I didn't hear anything other than the usual noise of spur gears. As Mitch said, be sure to drain and refill with the right oil. The first thing I do whenever I buy a car is change all the fluids and check the brakes. The only time I didn't check the rear end oil was when I was in El Paso in the Army, and I bought a 1962 Corvan. It was mint with a rebuilt motor and I bought it for only $150 because the motor missed on 2 cylinders. I adjusted the too tight rocker arms, and it was perfect. I changed all the fluids, except the rear end. I planned to do that when I drove it home on leave. I got into the middle of New Mexico and the rear end locked up due to lack of oil. It locked so sudden and complete that I didn't even have time to pull off the road. I had a pump oil can and a quart of motor oil, so I filled the rear end with it, let it cool for 30 minutes, then kept popping the clutch forward and reverse. I finally got it to move, but it sounded like a broken down threshing machine. I got to the middle of Kansas and it let go completely.

I got towed to the Chevy garage parking lot, where they let me the rear end in their parking lot, as I didn't have enough money to pay them. I found a good used rear end for $10 in a Corvair where the engine had been sold. Using my spare tire and sissors jack, I was able to change the rear end and get back on the road. The rear end ratio was now 3.27 from the car, instead of the 3.54 for the Corvan, but at least I could drive again. This was a tough lesson just for not checking the oil level right off the bat. And, would you believe this is the only time I didn't check this one item, and this is the only time it was really needed. Any time I gamble, I loose.
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Old 05-02-2013, 07:21 PM   #15
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Default Re: How loud is too loud for gears?

Just be aware, as said above - the "600W" oil is NOT 600 weight.
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Old 05-02-2013, 09:36 PM   #16
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Default Re: How loud is too loud for gears?

Sounds like a model a transmission .
On another topic. Have you greased the u-joint ? My 31 was bone dry when I purchased it .
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Old 05-02-2013, 11:02 PM   #17
columbiA
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Default Re: How loud is too loud for gears?

High gear seems to have a clunking noise to me.!st & 2nd only seem slightly noisier than a perfect trans with spur gears.Check the rear end for oil or broken pieces when you change the oil in it.And as said,grease the U-joint well thru fitting on rear brg retainer on trans.Drop the speedo drive hsg & grease until it comes out the speedo hole.With the speedo drive off,try pushing the DS up & down with a large screw driver & see how much side play there is.If more than about.015" you will likely need a new front DS brg & sleeve & brg surface on DS could be worn.
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Old 05-03-2013, 06:28 AM   #18
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Default Re: How loud is too loud for gears?

Ear Muffs at Penneys....

are they still in business?
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Old 05-03-2013, 06:45 AM   #19
Tom Wesenberg
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Default Re: How loud is too loud for gears?

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Ear Muffs at Penneys....

are they still in business?
I have a good wrench that has Pennys on it. I just barely remember when Pennys sold tools. I still miss Wards and their tools.
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Old 05-03-2013, 07:24 AM   #20
RonC
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Default Re: How loud is too loud for gears?

Change your fluid as others have recommended. 2nd gear does not sound good but could be the fluid. I use texaco 650T 1000 Cylinder Oil. The transmission in this car has never been rebuilt and doesn't leak that bad. https://www.youtube.com/watch?v=oMeHUTw9jkk
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