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  1. #1
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    Mar 2014
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    The Buzz with Steve Mags - Challenger Independent rear Suspension

    by Steve Magnante, Scat Pack Forums

    Even though Ford waited 50 years to embrace independent rear suspension (IRS) for its upcoming 2015 Mustang (jab excludes SVT Cobras), IRS has been part of every LC series Dodge Challenger since its triumphant return in 2008. Before that, things were much more basic. Those first generation 1970-’74 E-body Challengers rode on parallel rear leaf springs and live axles. The ride could be choppy on rough roads, but drag racers loved the indestructible layout – especially when the Chrysler 8-3/4 or Dana 60 rear axle and R/T-spec torque-biased leaf springs were utilized.

    While the modern LC Challenger’s IRS is plenty durable for general high performance use – the drivetrain development engineers design-in a healthy safety margin – the one-per-centers (a.k.a. hard core drag racers) sometimes push a little too far. Here’s a review of the Challenger rear suspension situation with some food for thought in case you’re a one-per-center! –Steve Magnante


    The stock Challenger IRS employs steel cage with a rigidly mounted differential unit, multiple links and articulated half-shafts. Un-sprung weight is reduced versus a live axle and the wheels remain perpendicular to the ground for ideal tire contact. It’s all good news as far as ride and handling are concerned. But on the strip, weight and occasional axle hop can be an issue.


    The stock cast aluminum differential housing (right) used with the 5.7 Hemi contains an 8.5-inch ring gear (8.9-inch with SRT). It’s beefy but all-out racers can step up to an aftermarket Dana 60-type unit (left) and bigger axle shafts and CV joints. The Dana was used under the original 426 Hemi Challengers and has a 9.75-inch ring gear.


    When the Mopar Underground released the Mopar Challenger 1320 Image Vehicle at the 2009 SEMA show, fans were blown away by the factory’s take on what a street legal LC22R Drag Pak Challenger might look like. In keeping with Dodge’s long standing theme of “over-building its cars - from the rear to the front” here’s a look at the Challenger 1320’s Dynatrac Dana 60 conversion kit installed to keep pace with its 426-inch Gen III Hemi. The Dynatrac Pro60-IRS system is easily adapted to any 2008-up Challenger, as well as all LX / LD Chargers and Magnums.


    Speaking of Drag Pak Challengers, all 2010’s were delivered with this Spartan affair bolted temporarily to the rear suspension hard points. Marked “shipping bracket only, discard”, it replaced the empty stock rear suspension cage supplied under 2009 LC22R Drag Pak Challengers. This photo shows the underside of Drag Pak #2010003, delivered new to Papa’s Dodge of New Britain, CT.


    For comparison, here’s a look at the 4-link, coil-over suspension under Big Daddy Don Garlits’ completed 2009 Drag Pak Challenger. Wearing body tag #20090001, it’s the first “regular production” Drag Pak made (excluding two 2008 proof-of-concept development mules). Don’s choice of the mighty Dana 60 speaks volumes for its indestructible nature. Note the subtle difference in the contour of the floor tunnel with the 2010 Drag Pak pictured above. All LC22R tunnels were hand modified for drive shaft clearance. This live axle setup is the ultimate for drag strip use, though street manners and road course handling fall short of the stock IRS configuration. –Steve Magnante

    http://stevemags.com
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  2. #2
    Join Date
    Aug 2010
    Location
    Portland, Oregon
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    Thanks for the info, Steve. Good stuff.

    My fantasy: I would like Chrysler to do a T/A Challenger. Strip it down like the Drag Pack, keep the IRS and drop in the V10. Build it to handle. One can dream.......
    DAVE -- 2007 Grand Cherokee SRT8: Mopar exhaust, Volant CAI, DCX Depot CMR tune, BT catch can, BWoody springs and end links, Jeepin by AL upper control arms

    Can you hyperground the leads to the mason jar and get even more torque and hp?
    Thanks Steve Mags thanked for this post

  3. #3
    Join Date
    Sep 2010
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    Whitby Ontario. Canada
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    Thank you for the Info Steve always a pleasure to read your articles.
    07 MRT R/T
    Thanks Steve Mags thanked for this post

  4. #4
    Join Date
    Sep 2017
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    17
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    This article made me search it check out the last 3 pages of this webpage...

    https://www.jegs.com/InstallationIns...2-P5155189.pdf

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