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Transmission Clang
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Powerflite
Posted 2017-05-13 11:39 PM (#539981)
Subject: Transmission Clang



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When I punch the motor in my '58 Dodge, the 3 speed auto trans makes a clanging sound. Almost like ringing a bell: clang, clang clang. But the trans seems to work fine all other times and makes no noise otherwise. This only happens when I punch it, and usually only when in 1st gear. Any ideas what is the problem? Something wrong with the E-brake maybe?
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wizard
Posted 2017-05-14 2:45 AM (#539985 - in reply to #539981)
Subject: Re: Transmission Clang



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Multiple "clang" indicates ball & trunnion, universal joint or parking brake
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finsruskw
Posted 2017-05-14 8:22 AM (#539986 - in reply to #539985)
Subject: Re: Transmission Clang



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That's the MoPar "clunk"
All mine have had that, clear back to the '56 Dodge in 1962!!
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Powerflite
Posted 2017-05-14 9:47 AM (#539991 - in reply to #539986)
Subject: Re: Transmission Clang



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I am familiar with the clunk. This isn't it; and none of my other A488 cars: two '57 Windsors and '58 DeSoto do this. This is like a bell ringing, metal on metal. I hadn't thought about the possibility of it being from the ball and trunion. Has anyone else seen something like this?
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wizard
Posted 2017-05-14 11:56 AM (#540007 - in reply to #539981)
Subject: Re: Transmission Clang



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Pull the propeller shaft and check both the ball & trunnion and the universal joint. Sometimes someone lost one or both end trust washers on the B&T.

If you had the car for a longer time and you notice this just now, pull the emergency brake drum and check for loose parts (return spring or anchor bolt clip and washer).

The MoPar "clunk" comes when the car has been reversed and a forward gear is engaged. This due to internal excessive free-play.

The MoPar "clunk" comes also if the "R" is engaged without first engaging the "D" (empty pressure circuit is filled with the highest pressure which creates a shock-wave.
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57chizler
Posted 2017-05-14 3:37 PM (#540017 - in reply to #539991)
Subject: Re: Transmission Clang



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Powerflite - 2017-05-14 6:47 AM

I am familiar with the clunk. This isn't it; and none of my other A488 cars: two '57 Windsors and '58 DeSoto do this. This is like a bell ringing, metal on metal.


Take something solid and rap on the propeller shaft, you'll probably hear the same clang. The loose u-joint(s) provide the rap and the echo through the hollow propeller shaft provides the clang.
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BigBlockMopar
Posted 2017-05-15 4:50 AM (#540048 - in reply to #539981)
Subject: Re: Transmission Clang



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Let's get some of the words that are used clear;

When you say 'punch it'... you mean flooring the throttle (in gear)?
Not 'punch' the gear selector from Neutral to Drive or Reverse, right?

Also, you say you hear multiple 'clangs', like "clang, clang, clang"?

Then I would think;
Could be a broken engine mount. Causing the engine to tilt under load and make the cooling fan hit the shroud or radiator.
Could also cause be an exhaust muffler that hits the driveshaft if they are mounted too close together.
Could be a broken transmission mount causing the transmission to move or 'jump' on the mount and cause noise.
Is the driveshaft still mounted soldily against the emergency brake drum?
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Powerflite
Posted 2017-05-15 10:17 AM (#540060 - in reply to #540048)
Subject: Re: Transmission Clang



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BigBlockMopar - 2017-05-15 1:50 AM
When you say 'punch it'... you mean flooring the throttle (in gear)?
Not 'punch' the gear selector from Neutral to Drive or Reverse, right?
Yes, when I floor the throttle
Also, you say you hear multiple 'clangs', like "clang, clang, clang"?
Yes, multiple clangs
Could be a broken engine mount. Causing the engine to tilt under load and make the cooling fan hit the shroud or radiator.
That's a good suggestion, but there is no fan shroud and nothing close enough to the fan to make that possible. I checked and don't see any marks on anything. Also, the sound is definitely coming from the rear.
Could also cause be an exhaust muffler that hits the driveshaft if they are mounted too close together.
The exhaust is not close enough to be a possible issue.
Could be a broken transmission mount causing the transmission to move or 'jump' on the mount and cause noise.
Is the driveshaft still mounted soldily against the emergency brake drum?
Yes, it is all still solidly mounted, but I will have to lift it up and check it out when I can free up some space to work on it. Chizler's suggestion that the metal clang was coming from a ringing down the driveshaft seems like the most probable explanation of what I am hearing. If the trunion was slipping beyond where it is supposed to ride, that could easily create the multiple clangs in the driveshaft. So I need to check out that ball & trunion closely (I know the rear u-joint & axle gears are fine as I recently replaced them) and also the e-brake setup. But the e-brake actually seems to work really well, no issues when I pull the lever. I just need to make sure everything is tight back there, and I will check the trans mount while I am there too. Thanks for the input!

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