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Mopar IRS #965877 04/04/11 04:26 PM 04/04/11 04:26 PM
Joined: Sep 2009 Posts: 319 Denver E Explodo OP enthusiast
Explodo OP enthusiast E Joined: Sep 2009 Posts: 319 Denver	A couple of years ago I posted about Blue Moon Motorsports making an IRS for mopars. That's definitely dead as of January of this year. With Heidt finally fixing their IRS to have an upper control arm, that looks to be a possibility, though one with a little bit of fabrication involved. Does anyone know of any other routes to an independent rear on a classic mopar? I don't care about drag racing at all, so typical "IRS = bad for drag" concerns are moot. '67 440 Satellite

Re: Mopar IRS [Re: Explodo] #965878 04/04/11 05:35 PM 04/04/11 05:35 PM
Joined: Sep 2005 Posts: 12,481 Chino Valley RodStRace I Live Here
RodStRace I Live Here Joined: Sep 2005 Posts: 12,481 Chino Valley	Have you looked at Vipers and LXs?

Re: Mopar IRS [Re: RodStRace] #965879 04/04/11 05:54 PM 04/04/11 05:54 PM
Joined: Sep 2009 Posts: 319 Denver E Explodo OP enthusiast
Explodo OP enthusiast E Joined: Sep 2009 Posts: 319 Denver	I'm okay with taking partial bits, like I'd have to do on the new Heidt thing, and then adapting it to work for me, but I distrust my ability to properly build a complete cradle that includes all mounting points for the arms and everything. My impression was that for the LX or Viper rears I'd have to build everything. Am I incorrect in that? Are they sub-assemblied enough that just an adapter need be fabricated? Edit: Okay, the LX is a subframe, but I can't find a complete picture of one anywhere. Anyone have a link? Last edited by Explodo; 04/04/11 06:54 PM.

Re: Mopar IRS [Re: Explodo] #965880 04/04/11 06:57 PM 04/04/11 06:57 PM
Joined: Jan 2003 Posts: 20,180 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,180 Park Forest, IL	There was a kid on here who put the IRS out of an early '90's Thunderbird under a '66 Dart or Valiant. He had lots of pictures, maybe he will chime in. "Everybody funny, now you funny too."

Re: Mopar IRS [Re: slantzilla] #965881 04/04/11 09:21 PM 04/04/11 09:21 PM
Joined: Nov 2003 Posts: 2,939 GA roadrunninMark master
roadrunninMark master Joined: Nov 2003 Posts: 2,939 GA	I think the IRS out of a Lincoln Mark VIII is what you are looking for, I believe they have a cradle system. Also, I thought about using the IRS out of 88-89 Conquest/Starion. This rear might not hold as much power as the 8, but it is Mopar (well, sort of)

Re: Mopar IRS [Re: roadrunninMark] #965882 04/04/11 09:26 PM 04/04/11 09:26 PM
Joined: Jan 2003 Posts: 1,436 Oklahoma City OK Cudajon pro stock
Cudajon pro stock Joined: Jan 2003 Posts: 1,436 Oklahoma City OK	The Lincoln is a great choice, plus parts can be found, comes with discs and the bolt pattern is 4.5 just like your Mope. Less than 2 bills at pull-a-part. Get everything. http://www.youtube.com/watch?v=4J3K94cRC1c

Re: Mopar IRS [Re: Cudajon] #965883 04/04/11 10:48 PM 04/04/11 10:48 PM
Joined: Jan 2008 Posts: 299 East Brunswick, NJ F finadk enthusiast
finadk enthusiast F Joined: Jan 2008 Posts: 299 East Brunswick, NJ	I looked into doing something like this for my 56 Dodge. I thought that the ford setup seemed clunky and modifying the width of the cradle created complications. I dont like the inboard brakes on the Jaguar setups that much. Corvette C4 components seem to be about the best option. Here is a link to a real nice setup 57 Chevy from the tri-five website that can give you some good ideas on what can be done. There would be a fair amount of fabrication involved but its is doable. http://www.trifive.com/forums/showthread.php?t=30205 Scott Scott 1956 Dodge Custom Royal Lancer (408 Stroker, 4 Wheel Disc Brakes, Rack & Pinion, 6 speed) 2002 Dodge Ram 1500 Quad Cab 1976 Corvette

Re: Mopar IRS [Re: roadrunninMark] #965884 04/04/11 10:57 PM 04/04/11 10:57 PM
Joined: Jan 2003 Posts: 8,027 Tulsa OK Bad340fish master
Bad340fish master Joined: Jan 2003 Posts: 8,027 Tulsa OK	Quote: I think the IRS out of a Lincoln Mark VIII is what you are looking for, I believe they have a cradle system. Also, I thought about using the IRS out of 88-89 Conquest/Starion. This rear might not hold as much power as the 8, but it is Mopar (well, sort of) The conquest/starion rear axle is pretty strong IIRC. I know I beat the hell out of mine lol. It had a sure grip that worked way better than anything ma mopar put out in the 60-70s as well. 68 Barracuda Formula S 340

Re: Mopar IRS [Re: Explodo] #965885 04/04/11 11:03 PM 04/04/11 11:03 PM
Joined: Dec 2007 Posts: 18,157 Mass DAYCLONA I Live Here
DAYCLONA I Live Here Joined: Dec 2007 Posts: 18,157 Mass	You should also consider track width, the LX is better suited for the 71-up B bodies, the 90's Thunderbird is better suited for early B (66-70) or 70-4 E bodies, the LX is a fragile unit in comparison to the Ford platform, theViper unit is nice, but look forward to a lot of fab to install it, as well as modding the unit itself, depending on your track requirements

Re: Mopar IRS [Re: Bad340fish] #965886 04/05/11 11:40 AM 04/05/11 11:40 AM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	The cool thing about IRS is the ability to plant the tires without even haveing an LSD now if you add one it will really help. Think about it, the reason a live axle open rear wants to spin the right rear tire is the tq from the driveshaft is lifting that side of the axle and planting the other, with an IRS suspension the suspension moves instead of the whole axle picking up the right side. The lifting/planting action is lost in the CV axle. Even with no LSD they hook nearly as good as a straight axle. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: Mopar IRS [Re: HotRodDave] #965887 04/05/11 01:03 PM 04/05/11 01:03 PM
Joined: Feb 2007 Posts: 612 Nampa, ID None2Slow mopar
None2Slow mopar Joined: Feb 2007 Posts: 612 Nampa, ID	That Ford rear is an 8.8 rear with 4.25 bolt circle. The cobra hubs will bolt on and give you the 4.5 you want. Not all tbirds had the 8.8, but had the 4.25 bolt pattern. The standard v6 had a 7.5. The SC v6 birds had the 8.8 traclok rear. Not all v8 birds had the 8.8 and if they did, may not have had traclok. If you go to www.sccoa.com you will get all the answers you need, including dementions.

Re: Mopar IRS [Re: roadrunninMark] #965888 04/05/11 01:40 PM 04/05/11 01:40 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	Quote: I think the IRS out of a Lincoln Mark VIII is what you are looking for, I believe they have a cradle system. Also, I thought about using the IRS out of 88-89 Conquest/Starion. This rear might not hold as much power as the 8, but it is Mopar (well, sort of) could look at the IRS in newer ford explorers, too.... 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: Mopar IRS [Re: patrick] #965889 03/21/12 01:34 PM 03/21/12 01:34 PM
Joined: Jan 2003 Posts: 6,085 NotRussia 2 2fast4yourBrain Whack top Dodger
2fast4yourBrain Whack top Dodger 2 Joined: Jan 2003 Posts: 6,085 NotRussia	I think the C4, Dana 44 is your easiest to fab. Granted, the trailing arms will limit tire/wheel width a little bit. Also, the later 88-96 are a bit wider so you'll need more positive offset wheels. Or you can narrow the driveshafts and get custom tie rods/link arms from Vette Brakes. 70 318 Chally vert FC7/XW (sold) 06 300c SRT8 04 2500 QCLB 4x4 HO 1971 BMW 2800CS 1955 Nomad 1970 280SL

Re: Mopar IRS [Re: slantzilla] #965890 03/21/12 01:46 PM 03/21/12 01:46 PM
Joined: Oct 2007 Posts: 3,892 Oregon hooziewhatsit master
hooziewhatsit master Joined: Oct 2007 Posts: 3,892 Oregon	Quote: There was a kid on here who put the IRS out of an early '90's Thunderbird under a '66 Dart or Valiant. He had lots of pictures, maybe he will chime in. https://board.moparts.org/ubbthreads/show...e=4#Post7046166 I'm friends with him, so I'll let him know there's another thread going... If you ever find yourself in a fair fight, your tactics suck.

Re: Mopar IRS [Re: hooziewhatsit] #965891 03/22/12 04:30 PM 03/22/12 04:30 PM
Joined: Aug 2006 Posts: 1,349 warfordsburg, PA dirt pro stock
dirt pro stock Joined: Aug 2006 Posts: 1,349 warfordsburg, PA	i have used the corvette C4 IRS in street rod projects. I have a jig set up to make the rear frame section with the attaching points for the C4 stuff. it works pretty good.

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