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1st day out after restoration - FMX trans noises


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Hi there,

Today, I had my 71 Mach 1 out on the streets after a 4 year restoration. Got me a temporary registration.

 

The road test was a disappointment. The front end alignment is far from perfect the Mallory ignition module toasted while starting up. I installed my spare distributor.

 

Mostly annoying was the ugly noise from the freshly redone FMX under acceleration. Some kind of grunt on harder acceleration. It is only present in 1st on launch. 2 and 3 are quiet. Shifting is normal, up and down.

 

I have readjusted the low/reverse band to make sure it is set correctly. It didn't make it better. Noise is still there.

 

Fluid is Type F, 11 quarts in the trans.

 

Does anyone have an idea what that could be?

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I do not know what it is but tis article may be helpful in diagnosing the problem. http://www.atraonline.com/gears/1997/1997-12/gdec97p36.htm

Let us know what you find. Good luck. Chuck

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Thanks for the reading stuff.

I just checked the fluid level and found it a 3/16 below "add". Poured in a can of Type F. Will try again tomorrow.

 

If it still makes the noise, I will drop the pan and check front band adjustment, but afaik the front band is not activated in 1st gear, isn't it?

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No advice on the transmission but thoughts of encouragement. It is not unusual for a few issues after a years long effort. What kind of 'grunt' is the transmission making?

'Mike'

73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

 

Pics of modifications included in: [button=http://www.7173mustangs.com/thread-1973-convertible--3335]My Garage[/button]

 

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Difficult to describe. The sound is a non-metallic creak, like it sounds when you go up an old wooden stairway. Or you rub a balloon with your thumb. Only occurs under load and only in 1st gear and in milder form in reverse.

 

Today, I drove the car 20 miles. After driving some miles, the car felt like "freeing up" like all new overhauled machines when you put them back in operation. The sound was less present after the drive. Maybe the sound is also some kind of friction that has to come into order while in operation. I will have an ear on it.

 

Here is the finished car after four years of restoration directly after the test drive.

 

DSC02658.thumb.JPG.587f782223a1b6fa97d8c360cecb2c17.JPG

DSC02659.thumb.JPG.c51003fca847bc313ad9fe10eaab4bd3.JPG

DSC02660.thumb.JPG.0bbb65f842b2707c4a8cf36cce0d4335.JPG

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Wow that was some really good info (link) Chuck. I learned a lot about transmissions. :)

But Spechti, I would use the methods described in the information and begin your diagnosis using the guage to begin eliminating areas and identifying true problems. Otherwise I think you will be chasing noises for a very long time.

 

Your Mustang is a beautiful car - I even like that Lincoln Mark IV I spoted in the garage. I had a super nice 71 Thunderbird (same color) I drove ocassionally to High School.

 

Good luck with your FMX.

 

Ray

1971 Boss 351  

1972 Q code 4 speed convertible 

1971 Mustang Sportsroof  351-2V FMX 

1971 Hardtop (parts car)

1973 Mach 1 (parts car)

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Wow, very impressed with your car. I really like the color combination.

-john

(jbojo)

351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,

C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

 

Some Mod pictures can be seen at: [button=http://www.7173mustangs.com/forum-garage?filterxt_uid=2026]Bojo's Garage[/button]

 

 

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Goodness that is sweet looking.

 

What transmission fluid type did you use? Were you able to locate Type F?

 

You might double check the transmission mounts are tight too. It would be easy to overlook in a 4 year project.

'Mike'

73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

 

Pics of modifications included in: [button=http://www.7173mustangs.com/thread-1973-convertible--3335]My Garage[/button]

 

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This excerpt from the ATRA article seems to fit your symptoms, I think. Chuck

Converter Noise

Swishing, whine, or moan: Gauge is steady. Has noise in forward and reverse; worse with slightly more throttle; goes away completely in park and neutral.

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Thanks for the comments, guys.

 

The trans is filled with type F and I rebuilt it myself with all new parts. It shifts clean and smooth like it should.

 

I have read the article and indeed the symptoms match the converter problem described. No noise in Park or Drive at idle. Also no noise in second or on acceleration at speed. Sound occurs when I put load on the trans in Drive, either with foot on the brake or on forced acceleration from standstill.

Very much disturbing is the fact that it was a new/rebuilt converter I used. I got it from Torco Enterprises in California. When this part is defect, I have to remove the trans again to change the converter once more.:@

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It could just be breaking in and has a few noises that could go away with use.

food for thought.

If you don't have time to do it right the first time, you sure as Hell don't have time to do it right the second time.

 

Dutch uncle

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I got it from Torco Enterprises in California. When this part is defect, I have to remove the trans again to change the converter once more.:@

 

I'd drop them an email and describe what you're experiencing to them. They should know (You'd hope at least) if the noises you're hearing are normal, or the signs of a bigger problem. I'd be hesitant to just "drive it and hope it goes away" for fear of it going south quickly and causing other damages.

 

I can only imagine how frustrating it is to be so close and have something go wrong, but it's a beautiful car, and a little caution now could save you a lot in the future!

2013 Ford Focus SE Flex Fuel 5spd - Daily Driver

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Great car. I have no idea how you guys possess the patience to take 4 years to restore a car. I could not wait 4 months.

Bright lime 72 Mach 1 with 351C 4V, with summit 600 carb(have a Holley too), Edelbrock dual-plane manifold, Hooker headers, 3 inch exhaust with flowmasters, 17 inch Eleanor wheels, FMX tranny, A/C, P/S, front disks and 350 rear gear. Drive it to work every day.

 

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