RE: [Chrysler300] F transmission mount donut
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RE: [Chrysler300] F transmission mount donut



On the H/J/K this part is called a “bumper” I think and I got mine from Imperial Services:  http://www.imperialservices.net/Cparts.html  Scroll down the page a bit.  They are a little slow in delivery – allow a few weeks – but the part was correct.  The F/G may be different (cast iron trans vs. 727 t-flite).  I know that the spring is a little different on F/G than on H/J/K but possibly the bumper is same???  Check part numbers, or Don Verity would know.   The transmission is designed to have a little up & down motion, but bad tranny mount/bumper and /or Detroit joint will bugger that all up.

Carl Bilter
300J


From: 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300]
Sent: Monday, May 15, 2017 2:02 PM
To: 'Richard Osborne'
Cc: 'Don Verity'; chrysler300@xxxxxxxxxxxxxxx; 'Jean-Yves Chouinard'; 'Jamie Hyde'
Subject: RE: [Chrysler300] F transmission mount donut

  
Exactly right, Richard ! It raises it up maybe ½” or a little less if in there. (mine was flattened out) But with it all apart, seeing how it works, tail of trans can move off center side to side too, if rubber not there ; weight of trans seems to compress spring about ½’ too . (good to know that) Maybe other F’s I had seen in past was already missing this piece? Why I never noticed that. But I have noticed that center bolt hanging down. Would transmit vibration to frame and cause a rattle? And allow U joint to decenter , side to side .

Perhaps Gary made it? I do not have his catalog handy..

From: Richard Osborne [mailto:reomotorsports1@xxxxxx] 
Sent: Monday, May 15, 2017 2:40 PM
To: John Grady
Cc: Don Verity; chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] F transmission mount donut

Hi John,

I too am interested in this. Now that you have mentioned it, I think I am missing the “donut" from my G. At idle, the exhaust is hitting the frame. I had assumed the motor mount(s) had gone bad, but the brake torque test made them look good. Next, the engine and trans seem to be sitting in car square, so the trans mount is OK. I got underneath the car and the center bolt seemed to be extended below the crossmember. I could lift the transmission up towards the floorboard, perhaps 1/2”, clearly something is missing, or the spring has permanently compressed to an undesirable height. I am now thinking I am missing the “donut” you mentioned. 

As I look in my ’61 parts book, this appears to be part number 2122280 “stop”. 

I am assuming the F and G are the same. Any chance this is what you are referring to? 

Best regards,

Richard Osborne

On May 15, 2017, at 11:59 AM, 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Anybody know if this is made? Or source? 

I have the rubber block type mounts, go on top of this, but found this rubber “wheeled Donut’ kind of thing , about 1.5” diameter at top of spring in lower trans mount was rotted out . Did not know it was there even , until today. 

Related, A518 fits in an F floor !! (A blocks / early / late hemi only) 

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