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which 8 3/4 rear is wider? 66-67 or 68-70? #956003 03/21/11 10:19 PM 03/21/11 10:19 PM
Joined: Nov 2005 Posts: 1,751 jacksboro,tn 1bad318 OP 1bad440
1bad318 OP 1bad440 Joined: Nov 2005 Posts: 1,751 jacksboro,tn	i need to know which is wider.i have a 67 rear.was thinking about moving the spring perches on it and put it in my 72 duster

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: 1bad318] #956004 03/21/11 10:29 PM 03/21/11 10:29 PM
Joined: May 2004 Posts: 1,377 Back In Iowa B belv2vert66 pro stock
belv2vert66 pro stock B Joined: May 2004 Posts: 1,377 Back In Iowa	I think there is a chart in the tech archives, but I have always thought the 68 on 8 3/4 was slightly wider

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: belv2vert66] #956005 03/21/11 10:35 PM 03/21/11 10:35 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	The link to the axle width chart is attached. http://www.moparts.org/Tech/Archive/axle/16.html

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: 1bad318] #956006 03/21/11 11:04 PM 03/21/11 11:04 PM
Joined: Jan 2003 Posts: 74,942 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,942 U.S.S.A.	The 68-70 is wider. Some members have just forced the springs into place putting a B body rear in their a body , it's something I would do though.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: JohnRR] #956007 03/22/11 01:23 AM 03/22/11 01:23 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	Its a cheap and dirty move to spread the springs. This places undue stress on the shackles and bushings. A decent tech can save the spring pads when removing them and simply move them inboard the 1/2" each side.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Kern Dog] #956008 03/22/11 01:31 AM 03/22/11 01:31 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: Its a cheap and dirty move to spread the springs. This places undue stress on the shackles and bushings. A decent tech can save the spring pads when removing them and simply move them inboard the 1/2" each side. Yes they can be saved, I've done it, but sometimes it's easier to cut the old ones off & install new ones.. The MP spring perch kit is only $12 from Summit.. "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Kern Dog] #956009 03/22/11 01:34 AM 03/22/11 01:34 AM
Joined: Apr 2010 Posts: 1,216 Under My Car Mopar_Country pro stock
Mopar_Country pro stock Joined: Apr 2010 Posts: 1,216 Under My Car	I was on another forum and there was a guy that did just that and saw nothing wrong with it. He even posted a pick, and even though it's only a half inch on either side you could see the strain it was putting on the spring, not good. I can't speak for him, but I think John meant it's something he wouldn't do. You will also need to run a bigger backspace on the wheels too.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Mopar_Country] #956010 03/22/11 01:48 AM 03/22/11 01:48 AM
Joined: Jan 2003 Posts: 74,942 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,942 U.S.S.A.	Quote: I was on another forum and there was a guy that did just that and saw nothing wrong with it. He even posted a pick, and even though it's only a half inch on either side you could see the strain it was putting on the spring, not good. I can't speak for him, but I think John meant it's something he wouldn't do. You will also need to run a bigger backspace on the wheels too. I would definitely not do it , there are some on this site that have done it and see no problem with it . I'm not sure why I mentioned it , but I know someone will eventually jump in saying ... come on in the waters fine .

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: JohnRR] #956011 03/22/11 01:55 AM 03/22/11 01:55 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	I knew that it was a typo John, I know you're intelligent enough to know whats right. The Mancini spring plates may work, but the 2 sets I bought from Summit had pilot holes too large for me. Thats why I save the stock pads. I've modified 4 axles in the last 3 years this way.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Kern Dog] #956012 03/22/11 02:04 AM 03/22/11 02:04 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: I knew that it was a typo John, I know you're intelligent enough to know whats right. The Mancini spring plates may work, but the 2 sets I bought from Summit had pilot holes too large for me. Thats why I save the stock pads. I've modified 4 axles in the last 3 years this way. Were the plates the Mopar Performance pieces? I just bought a set & they were Ok.. "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: 1_WILD_RT] #956013 03/22/11 02:47 AM 03/22/11 02:47 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	The plates WERE the MP units. The holes were larger. My wild guess is that the holes were about 5/8" and the stockers were about 7/16".

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Kern Dog] #956014 03/22/11 02:50 AM 03/22/11 02:50 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Mopar Stockers are 1/2" GM stockers are 19/32''.... 1/32'' smaller than 5/8'' so I'm sure thats what they sold you... Thanks MP... Nothing new... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Kern Dog] #956015 03/22/11 02:55 AM 03/22/11 02:55 AM
Joined: Nov 2005 Posts: 1,751 jacksboro,tn 1bad318 OP 1bad440
1bad318 OP 1bad440 Joined: Nov 2005 Posts: 1,751 jacksboro,tn	thanks guys

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: ahy] #956016 03/22/11 02:58 AM 03/22/11 02:58 AM
Joined: Dec 2010 Posts: 12,375 SoCal MuuMuu101 I got lucky at Woodward!
MuuMuu101 I got lucky at Woodward! Joined: Dec 2010 Posts: 12,375 SoCal	Quote: The link to the axle width chart is attached. http://www.moparts.org/Tech/Archive/axle/16.html Wait, I am confused. According to this all A-body 8 3/4 are the same length from 66-72.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: MuuMuu101] #956017 03/22/11 03:52 AM 03/22/11 03:52 AM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Quote: Quote: The link to the axle width chart is attached. http://www.moparts.org/Tech/Archive/axle/16.html Wait, I am confused. According to this all A-body 8 3/4 are the same length from 66-72. They are... 52 5/8" and 57 1/8 total I've spread the springs before, not my favorite thing to do. I prefer to move the perches.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: RobX4406] #956018 03/22/11 11:49 AM 03/22/11 11:49 AM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	MP Spring perches are actually OEM Dakota pieces. The 5/8" pilot hole in the perch is a non-issue because the housing is also located off the 1/2" hole in the shock plate. If you are worried about the perch pilot hole, a lock washer under the head of the spring center bolt works as a bushing. Contact info

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: DoctorDiff] #956019 03/22/11 02:36 PM 03/22/11 02:36 PM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	Hmmmmm. I never considered the shock plate as a locater.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Kern Dog] #956020 03/22/11 02:49 PM 03/22/11 02:49 PM
Joined: Jan 2003 Posts: 20,460 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,460 Eagle, Idaho	Any decent 4x4 shop should have leaf spring bolts with a larger diameter head that will fill up the gap on the MP spring perches.

Re: which 8 3/4 rear is wider? 66-67 or 68-70? [Re: Neil] #956021 03/22/11 03:29 PM 03/22/11 03:29 PM
Joined: Apr 2010 Posts: 1,216 Under My Car Mopar_Country pro stock
Mopar_Country pro stock Joined: Apr 2010 Posts: 1,216 Under My Car	I have used a pipe nipple welded in the hole, ground off flush on both sides and drilled accordingly.

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