Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: Gabmando]
#2866207
12/29/20 08:46 PM
12/29/20 08:46 PM
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Joined: Jan 2011
Posts: 15,931 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,931
Central Florida
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I think whether they squeak or not has a lot to do with the suspension design too. I have had polygraphite and urethane in Diplomat Police cars in the entire front end and had no squeaking. Never found them to be too stiff either. Really not any noticeable difference to me. So I would probably recommend polygraphite so that if there was going to be any squeaking it might help with that and not require routine greasing. I also had PST's and was happy with them. I know you mentioned you did not want solid mounts. I have to say, one of the best upgrades I did on my Diplomat Police cars were aluminum k-frame biscuits from firmfeel. So much better high speed handling and just handling overall, and no bad side effects whatsoever.
Facts are stubborn things.
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: larrymopar360]
#2866210
12/29/20 08:54 PM
12/29/20 08:54 PM
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Joined: Jan 2003
Posts: 13,610 md
mopars4ever
I Live Here
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I Live Here
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md
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: larrymopar360]
#2866214
12/29/20 09:04 PM
12/29/20 09:04 PM
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Joined: Jan 2003
Posts: 15,552 Norwich CT USA
moparts
I Live Here
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I Live Here
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I think whether they squeak or not has a lot to do with the suspension design too. I have had polygraphite and urethane in Diplomat Police cars in the entire front end and had no squeaking. Never found them to be too stiff either. Really not any noticeable difference to me. So I would probably recommend polygraphite so that if there was going to be any squeaking it might help with that and not require routine greasing. I also had PST's and was happy with them. I know you mentioned you did not want solid mounts. I have to say, one of the best upgrades I did on my Diplomat Police cars were aluminum k-frame biscuits from firmfeel. So much better high speed handling and just handling overall, and no bad side effects whatsoever. At one time Chrysler had a police kit to replace the bushings with Cast iron biscuits , I did that on my 79 300
Tom ,
2011 Ram 3500 C&C Diesel 2009 Challenger R/T 1971 Challenger Conv. 511/4 speed 1970 Challenger R/T 503/727
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: moparts]
#2866216
12/29/20 09:07 PM
12/29/20 09:07 PM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
master
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master
Joined: Feb 2003
Posts: 7,982
Scranton, PA
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One of the poly kits has an oval, steel insert; the other does not. I would buy the one with the insert. Check Rockauto for good prices.
EDIT - the Energy Suspension ones have the captured insert. If you look at the same set in red you can see it. Don't forget poly for the torsion crossmember, too.
Last edited by Montclaire; 12/29/20 09:12 PM.
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: moparts]
#2866218
12/29/20 09:11 PM
12/29/20 09:11 PM
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Joined: Jan 2011
Posts: 15,931 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,931
Central Florida
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I think whether they squeak or not has a lot to do with the suspension design too. I have had polygraphite and urethane in Diplomat Police cars in the entire front end and had no squeaking. Never found them to be too stiff either. Really not any noticeable difference to me. So I would probably recommend polygraphite so that if there was going to be any squeaking it might help with that and not require routine greasing. I also had PST's and was happy with them. I know you mentioned you did not want solid mounts. I have to say, one of the best upgrades I did on my Diplomat Police cars were aluminum k-frame biscuits from firmfeel. So much better high speed handling and just handling overall, and no bad side effects whatsoever. At one time Chrysler had a police kit to replace the bushings with Cast iron biscuits , I did that on my 79 300 I remember that kit. A NOS one popped up on ebay a year or so ago. Best upgrade ever!
Facts are stubborn things.
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: mopars4ever]
#2866306
12/30/20 05:45 AM
12/30/20 05:45 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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I was searching for them to post the option on thread, but on eBay. Tipically FMMOPAR had them in $299 as far I recall. AMD also shows them on a similar price than Moparmall but out of stock. There is an ebay seller offering just the K member pieces thought. This would be my option but not at that price. Saying that and per what has been said here, would go with urethane. Is really the rubber way more expensive material than poly or urethane to be sold on THAT price comparing with poly/urethane?
Last edited by NachoRT74; 12/30/20 05:54 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: NachoRT74]
#2866489
12/30/20 02:24 PM
12/30/20 02:24 PM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
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Valencia, España
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Well As I told I knew FMMOPAR had those, but weird is not with the T bar crossmember isolator too. I know they had it on $299 or so K member isolators FMMOPAR There is a crazy guy selling the full set on $377
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: NachoRT74]
#2866584
12/30/20 04:35 PM
12/30/20 04:35 PM
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Joined: Jan 2003
Posts: 13,610 md
mopars4ever
I Live Here
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I Live Here
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: mopars4ever]
#2866611
12/30/20 05:39 PM
12/30/20 05:39 PM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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Thaaaats the one. Dunno why I couldn't find it earlier!!!!
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: moparts]
#2866666
12/30/20 07:11 PM
12/30/20 07:11 PM
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Joined: Jan 2003
Posts: 16,840 Between Houston & Galveston TX
SattyNoCar
Smarter than no class Flappergass by a mile
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Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,840
Between Houston & Galveston TX
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I think whether they squeak or not has a lot to do with the suspension design too. I have had polygraphite and urethane in Diplomat Police cars in the entire front end and had no squeaking. Never found them to be too stiff either. Really not any noticeable difference to me. So I would probably recommend polygraphite so that if there was going to be any squeaking it might help with that and not require routine greasing. I also had PST's and was happy with them. I know you mentioned you did not want solid mounts. I have to say, one of the best upgrades I did on my Diplomat Police cars were aluminum k-frame biscuits from firmfeel. So much better high speed handling and just handling overall, and no bad side effects whatsoever. At one time Chrysler had a police kit to replace the bushings with Cast iron biscuits , I did that on my 79 300 I've got an old DC kit on my wagon. Never understood how people say a solid K rides SOOOOOO much harsher, when, essentially all you've done is make it like a '72 / older. If there is indeed any added harshness, the tradeoff for better handling is worth it. But, I digress.....
John
The dream is dead, long live the dream.......😥
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: moparx]
#2867036
12/31/20 03:29 PM
12/31/20 03:29 PM
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Joined: Jan 2003
Posts: 16,840 Between Houston & Galveston TX
SattyNoCar
Smarter than no class Flappergass by a mile
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Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,840
Between Houston & Galveston TX
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is the torsion bar cross member isolated on the later B bodies like the K member ? my old mind forgets. if so, are there kits to mount it solid ? Yes, the T-bar crossmember is isolated, so the car basically ends up with two crossmembers (the T-bars pass thru the first one). Firm Feel makes solid mounts for the K and the crossmember.
John
The dream is dead, long live the dream.......😥
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: moparx]
#2867404
01/01/21 11:23 AM
01/01/21 11:23 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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Hence the reason why 73 and Lates T-Bars are longer than previous years and just aftermarket pieces are available, nothing from MP
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: SattyNoCar]
#2867726
01/01/21 07:35 PM
01/01/21 07:35 PM
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Joined: Jan 2011
Posts: 15,931 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,931
Central Florida
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I think whether they squeak or not has a lot to do with the suspension design too. I have had polygraphite and urethane in Diplomat Police cars in the entire front end and had no squeaking. Never found them to be too stiff either. Really not any noticeable difference to me. So I would probably recommend polygraphite so that if there was going to be any squeaking it might help with that and not require routine greasing. I also had PST's and was happy with them. I know you mentioned you did not want solid mounts. I have to say, one of the best upgrades I did on my Diplomat Police cars were aluminum k-frame biscuits from firmfeel. So much better high speed handling and just handling overall, and no bad side effects whatsoever. At one time Chrysler had a police kit to replace the bushings with Cast iron biscuits , I did that on my 79 300 I've got an old DC kit on my wagon. Never understood how people say a solid K rides SOOOOOO much harsher, when, essentially all you've done is make it like a '72 / older. If there is indeed any added harshness, the tradeoff for better handling is worth it. But, I digress..... Eggg zactly! People weren't bitching about a harsh ride back in the pre '73 cars. To o/p: NOW is the time to get rid of the rubber K frame isolators! You won't regret it. And that seller of the rubber ones is always super high priced. At least go polyurethane for better handling AND save money.
Facts are stubborn things.
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Re: Urethane Vs. Polyurethane Vs. Polygraphite
[Re: Gabmando]
#2868642
01/03/21 09:09 PM
01/03/21 09:09 PM
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Joined: Apr 2004
Posts: 192 TC, Minnesota
Gabmando
OP
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OP
member
Joined: Apr 2004
Posts: 192
TC, Minnesota
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Thank you all for the responses. This has been quite the education. In the old days one could have walked into a parts store and looked at the parts. Not any more! Thanx again guys.
Last edited by Gabmando; 01/03/21 09:10 PM.
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