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Got a drivetrain vibration issue I'm hoping everyone out there can help me track down that I've noticed the last few months with my '72 Challenger.  Fully loaded, i.e. full tank of gas with four vehicle occupants, the car exhibits a rumbling or rattling noise and vibration when accelerating from a stop or while accelerating at speed.  The rumbling/rattling seems to originate from the rear and the vibration reverberates through the driveshaft tunnel and floorpan.  However, with less than a full load, e.g. less than four passengers or half a tank of gas or less, I don't notice a noise or vibration at all.  When the noise/vibration occurs, I don't drive the car over 35 mph for fear of causing any damage. 

My Challenger is fairly stock, with a 318, A-904-LA, 3.23 SG 8 3/4 in. rear ("489" case), 4-bbl TQ carb, dual exhaust, front and rear swaybars mounted in stock locations, standard duty ESPO rear springs, 0.90 in. OEM Mopar torsion bars, driveshaft safety loop, and reproduction Goodyear Polyglas F70-14 tires (weekend/fair weather cruiser around town, though considering a second set of wheels with radials for more all-weather use.)  I've maintained this configuration for almost 10 years without any issues.  The only thing I've done recently is having a polyurethane rear transmission mount installed when I had the transmission rebuilt last summer.  Could this polyurethane mount be the cause of the noise/vibration issues?

Thanks very much!
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Your welcome , the 4 speed is not original to the car , but there are no issues with the shifting.
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73440 thatís exactly what I needed, thanks so much!
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Electrical / Re: wire to trunk lid?
« Last post by davidhilldallas on Today at 01:11:40 am »
but there is no light in the lid... him, maybe its missing. need to into that.

thanks
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Engine & Go Fast Goodies / Re: Coolant in oil
« Last post by 70chall440 on June 15, 2019 - 07:51:58 pm »
Good plan, normally its the rod bearings. To that end, the bearings may have a PN written on the backs of them. Hopefully you didn't spin one.
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Engine & Go Fast Goodies / Re: Coolant in oil
« Last post by smallblock on June 15, 2019 - 07:10:23 pm »
Once again thanks so much for your help and advice. I'm thinking about changing the rod bearing by dropping the oil pan. Never done it before but figured it's with a try and is the only shot at getting the car back on the road at all this year. Since I have no idea what the crank was turned down to can I take the old bearings I remove to a machine shop or Mic the crank or what to get the size of replacement bearings? Thanks
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https://photos.app.goo.gl/ZrmP1nH3QNmEbqLz5

Try this link for photos , description of photos in in lower left corner or click info symbol in upper right corner.

1) neutral
2) 2nd
3) 1st
4) console rear hole
5) end of rule against rear of shifter when in 1st
6) console distance to rear hole
7) console mounting holes
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Have a 73 , can put the console back in and check, not sure if it will be the same , I would think it would be.
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Electrical / Re: wire to trunk lid?
« Last post by hofilbert on June 15, 2019 - 03:10:54 pm »
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Electrical / Re: wire to trunk lid?
« Last post by 70chall440 on June 15, 2019 - 02:56:23 pm »
Trunk light
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