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Old 09-13-2017, 05:11 PM   #1
FlatheadTed
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Default French flathead ,Stabliser rods

We have a bad clutch judder on a open drive shaft with 9" and two springs in the rear ,its set up like a mustang .I am thinking this needs stabiliser rods .Any one experienced this ,Thanks Ted
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Old 09-13-2017, 05:38 PM   #2
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Default Re: French flathead ,Stabliser rods

What are the engine and tranny mounts used??
Paul in CT
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Old 09-13-2017, 06:18 PM   #3
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Default Re: French flathead ,Stabliser rods

The old torque tube would put a pretty good push on the drive train that could cause the clutch linkage to move out of whack under certain conditions. With dual springs & open drive, the only load would be torque related. Unless the motor & trans mounts are badly worn, there should be little or no clutch equalizer movement under load. Maybe the pressure plate needs some finger adjustment or something of that nature. Either that or there is some unequal wear on the parts there. I don't think radius rods will help much with open drive.
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Old 09-13-2017, 06:24 PM   #4
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Default Re: French flathead ,Stabliser rods

Don't see how "stabilizer rods" would be of any benefit, there should not be any forward thrust with the open driveshaft. Believe you need to look elsewhere.
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Old 09-13-2017, 06:35 PM   #5
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Default Re: French flathead ,Stabliser rods

Thanks so far .it has stock front mounts all new and a GM type one under the gear box ,T 5 ,I was thinking stabiliser rods (bell housing to chassis )not radius rods ,French moter doesn't have the holes drilled for them ,Ted
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Old 09-13-2017, 06:39 PM   #6
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Default Re: French flathead ,Stabliser rods

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And what would they accomplish? Engine torque is not going to move the engine forward or aft. The rods are to stop forward and aft movement which shouldn't exist with your setup.
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Old 09-13-2017, 07:41 PM   #7
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Default Re: French flathead ,Stabliser rods

Yes I tend to agree ,but there is movement there some were ,it has a Diaphragm clutch so could be something out of line Ted
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Old 09-13-2017, 11:42 PM   #8
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Default Re: French flathead ,Stabliser rods

If the engine is loose on the motor mounts then force on the clutch linkage could move the whole assembly and maybe the rods would help. I would stiffen up the mounts to stop any movement myself, but try the rods and see if it helps. Should be fairly easy to test.
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Old 09-14-2017, 12:07 AM   #9
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Default Re: French flathead ,Stabliser rods

How bad is the rear main leaking? Any chance you have picked up oil on the clutch disk? That will cause chatter.
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Old 09-14-2017, 12:40 AM   #10
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Default Re: French flathead ,Stabliser rods

OK thanks for the suggestions. No oil leak ,All new clutch ,I am thinking badly machined bell housing adapter to T 5 .
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Old 09-14-2017, 02:55 AM   #11
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Default Re: French flathead ,Stabliser rods

If my experience with open drives and stabilizers is anything to go by, even when a stabilizer to the head-firewall is present there can still be wiggle room for the shudder you describe.
A cable from somewhere on the gearbox running rearward to a crossmember helped a lot. You might find a similar solution.
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Old 09-14-2017, 12:07 PM   #12
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Default Re: French flathead ,Stabliser rods

Quote:
Originally Posted by FlatheadTed View Post
OK thanks for the suggestions. No oil leak ,All new clutch ,I am thinking badly machined bell housing adapter to T 5 .
That's not good! Keep us posted on what you find.
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Old 09-14-2017, 02:48 PM   #13
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Default Re: French flathead ,Stabliser rods

Like this Ben ,one for the model As ,Thanks all ,Ted

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Originally Posted by dumb person View Post
If my experience with open drives and stabilizers is anything to go by, even when a stabilizer to the head-firewall is present there can still be wiggle room for the shudder you describe.
A cable from somewhere on the gearbox running rearward to a crossmember helped a lot. You might find a similar solution.
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Old 09-15-2017, 04:36 AM   #14
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Default Re: French flathead ,Stabliser rods

I have a 4 speed top loader style gearbox and I had really bad clutch chatter, it turnd out the rear gearbox mount was too soft and when I pressed the clutch peddle it would cause the whole engine and gearbox to move up at the rear, pulling up on the gearbox mount.

I used a flathead front engine mount top make a 2nd rear mount so I could crank the gearbox down hard, its %100 better.
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Old 09-15-2017, 11:56 AM   #15
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Default Re: French flathead ,Stabliser rods

Whats the history on the French Flathead. Has it been rebuilt? A lot of the French engine cranks run oversized thrust faces on the rear main bearings normally +20 thou. If it's been rebuilt and fitted with standard rear main bearing thrust faces you will have massive end float which could cause clutch judder.

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Old 09-15-2017, 02:57 PM   #16
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Default Re: French flathead ,Stabliser rods

OK Thanks again ,We will look into the end float ,Yes the rear mount I believe is soft ,I don't have the car in the shop yet ,Ted
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Old 09-16-2017, 02:54 AM   #17
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Default Re: French flathead ,Stabliser rods

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Originally Posted by FlatheadTed View Post
OK Thanks again ,We will look into the end float ,Yes the rear mount I believe is soft ,I don't have the car in the shop yet ,Ted
I am in West Auckland if you want to have a look at my fix or need suggestions, I bet 100% its doing what my gearbox mount was doing.
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