Magnumforce 4130 Chromoly Tubular K-Member Suspensions for Mopars
Take up to 150 lbs. off the front suspension of your Dodge, Chrysler, or Plymouth Mopar Muscle Car and gain incredible header and oil pan Clearance with this Super High Tech, TIG welded, 4130 Chromoly suspension conversion system for Mopars! And now with right hand drive rack and pinion steering for our fellow Australian and British Mopar owners!
73-74 B-body Mopar XRT tubular suspension conversions now available! Check out the new ad !
Suspension installation video
Order A, B, and E, Body Mopar Suspensions Online
Cuda, Barracuda, Challenger, Charger, GTX, Roadrunner, Superbee, Satellite, Coronet, R/T, Fury, Sport Fury, Belvedere, and all B and E-body Mopars
Late Model A-Body Mopars like Dart, Duster, Demon, Barracuda, and Valiant
Street Customs - Boyd Coddington Tribute Plymouth Barracuda - Click here to see Magnum Force Mopar suspension installation.
Early A-body Mopars like Dart, Barracuda, Valiant, Signet
Customize yours with these options:
Manual steering with quick ratio
Tubular sway bar with rod end style end links
Single or Double adjustable Coil overs with Drag Race or Road Race valving
Powder coating in 12 different colors
Magnumforce Mopar Suspension Conversion Vital Statistics
Eliminates Torsion Bars leaving much more clearance for headers. Eliminates center link leaving additional room for oil pan capacity and no hole through pan as well as shallow depth yielding more ground clearance. Lightens front end of car by 100 to 150 pounds. More positive caster for improved high speed stability. Reduced side scrub and Camber change throughout suspension travel. Rigid Lightweight 4130 condition N Chromoly construction and all TIG welded for superior strength and appearance. All new components. No need to rebuild any of your stock suspension or steering. Custom rack and pinion assembly available in matte finish or chrome. Billet Aluminum Aldan Eagle or QA1 coil overs and billet CNC machined 6061 T-6 upper mounts. Billet Aluminum swaybar clamps and tubular splined swaybar available. Billet sealed needle bearing style steering universal joint with splined rack adapter and Double "D" shaft. Chromoly Teflon lined rod ends each rated in excess of 28,000 lbs radial load capacity or opt for the XRT version for 1-1/4" lower arms and rod ends rated over 40,000 lbs. Includes spindles with larger bearing diameters in either 1-1/2" or 3-1/2" dropped configurations. Optional* Wilwood disc brake conversion drops another 30 to 35 lbs. Select from stock type motor mounts or super strong, high tech bushed or solid motor plates.
Steering ratio - The ratio of the manual standard unit is (18:1) 3.75 turns lock-to-lock. and the quick ratio unit is 15:1 which is 25% faster than a standard unit at 3.3 turns lock-to-lock. Power is 18:1. Either is substantially nicer to drive than a stock manual box.
Mopar Suspension Installation examples (Scroll to the right for more Magnum Force Suspension images)
7 & 9 quart Hemi and Big block Mopar pans that don't hang below the k-member
Click to see Magnum Force weld quality sample
Many powder coating colors available !
Comparing front end conversions:
Why consider this conversion over other companies now copying Magnum Force concepts? To start with, high quality seamless 4130 Chromoly Condition N tubing and super clean and strong TIG welding is utilized throughout, resulting in superior strength, lighter weight, and a high tech professional appearance. We do not MIG weld them and then grind off our welds, nor miter and butt weld any joints, crush the inside radius of the tubes, or use cheap square mild steel or aluminum stock in building our suspension. There are no converted light duty 1" mild steel street rod lower control arms which commonly fold in half, or those originally intended for lightweight GM cars and no inclusion of any stainless steel, who's capabilities are half that of 4130, and will not survive in a suspension application. Notice in the images above the substantial amount of cross sectional area spanning side to side in the k-member itself. Without this 10" wide span the only item connecting your frame rails is the piece of sheet metal under the radiator!
Our asymmetrical lower control arm design locates everything forward of the front axle centerline rather than a symmetrical "A" style shape, giving maximum clearance for the headers. Oil pan clearance is substantial due to the design of the k-member locating the bracing forward of the rack. We got together with Milodon to make oil pans specifically for Magnum Force suspensions to take advantage of this clearance, which allows these 7 to 9 qt. pans to be used without hanging below the k-member.
Over 25 years of experience building extreme vehicle chassis and suspensions such as Top Fuel, Pro Stock, and A-Gas Nostalgia goes into every product we make. We've raced, driven, and shown Mopars of our own since 1979, giving us a greater insight to a Mopar owners wants and needs.
As for starting from scratch, the typical cost involved in "front halving" a car will run as much as $12,000 in parts and labor to convert to a complete Pinto/Mustang II or strut front snout. The frame, inner fender wells, and core support must be cut off of the car and the new frame welded on in the most precise manner possible; typically on a chassis jig. All existing sheet metal or fiberglass body panels must be re-mounted and aligned as well as the radiator, headlight assemblies, and inner fender wells.
Most frequently asked questions:
Why can't I just swap my ball joints from side to side and install a stock Pinto or Mustang II rack?
If the car never had to turn and had no suspension travel this would be fine. Bump steer and Ackerman come into play here and are critical issues in front suspension geometry which necessitates internal and external modifications to accrue the ideal pivot point locations and to alleviate problems associated with these two issues. The original suspension locations in a Mopar originally configured for rear steering are not the same as a suspension designed to be on a front steer vehicle.
What does it take to install it and what other modifications might be considered?
The installation procedure involves basic hand tools but some items may require special consideration.
Oil pan clearance: This is one of the many benefits this suspension conversion offers. We have Pre-Made oil pans built by Milodon for Magnumforce suspensions to facilitate installation. The rack assembly passes under the forward most leading edge of the oil pan. Some pans and engine locations may require a slight notch. This notch is in front of the engines reciprocating assembly though and will not interfere with counterweights. A custom or "dragster/funnycar" style pan available here can be installed which would allow a very large oil capacity and also allows substantial ground clearance. No deep sump to hit speed bumps on the return road. The use of dual external swinging pickups is made easier as well. No more center link through the oil pan!
Header clearance: There is a very large improvement in available header clearance but it is possible some out of the box brands may require some type of change in a tubes location. We've found that Headers by "TTI" Tube Technoligies Inc. fit exceptionally well and are of the highest quality available.
Motor Mounts: Magnumforce now offers motor mounts on the k-member designed to use a stock isolator, however a motor plate offers several advantages. It eliminates the stresses on the block that result from the engine twisting in the chassis which results in the side of the block cracking as well as the cylinder wall distortion that occurs internally. It ties the frame rails together across the topside creating greatly improved triangulation of the chassis and is very versatile in that it allows the engine to be moved up, down, fore, or aft to accommodate custom needs such as increased clearance or more engine setback for improved weight distribution. A Mopar motor plate/mid plate arrangement or elephant ears work wonderfully in mounting the motor in the chassis of a Mopar which can be ordered above. The pre-drilled holes facilitate easy mounting of the alternator and power steering pump and it includes a crank pulley spacer to make pulley alignment easy.
How low will my Mopar sit? How do other items clear?
The typical dimension of greatest importance is that of the forward-most edge of the frame (core support area) to the ground. This dimension ranges from 10"-13" but is altered by tire diameter and the installed height of the coil over assy. It is not recommended to adjust the coilovers lower for suspension geometry and misalignment reasons, unless our dropped spindles are used, which can allow the car to go another two inches lower for a total of 3-1/2" lower. Custom headers may be required if using our 3-1/2" dropped spindles unless big diameter wheels are used (i.e. 20") 17's may be considered a minimum with these lowered spindles, as variations in offsets may cause clearance issues to the rack pickup. Here is a more accurate dimension accrued from a 73 Cuda and a 69 Daytona Charger using our 1-1/2" dropped spindle. With a 24" tall tire and the coilovers at 12" installed height, the distance from the ground to the frame measured near the core support is 12-3/4". This suspension has 4-1/2" of travel measured at the spindle tip. The TTI Hemi headers installed on these cars measure 3-3/4" to the ground at the lowest point.
Here's another example from our own 72 Charger. Using our 3-1/2" dropped spindles with the coilovers adjusted to 12" installed height and using a 24-1/2" tall tire will yield a measurement of 10-3/4" from the frame to the ground measured at the bottom of the frame near the core support. The TTI headers installed on this car measure 1-3/4" to the ground at the lowest point but 2" the majority of the length of the header collector. Do keep in mind that the collector is measured nearly two feet behind the front axle centerline.
Wheel offset. Our own 1970 Dodge Challenger will be our example here. Using our dropped spindles and 17" wheels we used an 8" wide wheel on the front of the car. Anything bigger may need some mods to the car, but could be made to work. The backspacing on this 8" wheel is 5-1/8" measured to the inner portion of the lip. With the car this low the end result was that the tire nearly touched the inner fenderwell and out fender lip simultaneously at full turn. The lower the car is, the tighter the clearance gets, since Mopars have a taper on the inner fenderwell and the critical diameter of the wheel increases as well. We all want big wheels on our cars so keep in mind things can get tight. No more 14" Polyglass GT's for our Mopars!
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Additional components for a more complete installation:
Motor Plates for Mopar Hemi, Big Block, and Small block Used instead of stock type motor mounts. Reduces stress on the block and ties frame rails together for big increase in frame strength
Milodon Magnumforce oil pans for Big Block and Hemi Most stock pans will fit with Magnum Force suspensions, but this greatly increases capacity up to 9 qts with no ground clearance issues.
Wilwood Disc Brake kit for Mopar Tubular K-members 10-3/4" 4-piston kit for use with 15" and up wheels.
BIG Brakes - 6 piston caliper brakes for Mopar K-members 13" 6-piston kit for use with larger wheels. (Most 17" and up)
TTI Tube Technologies Inc. Headers, Exhaust systems, Tips, and more! The highest quality headers available for Mopars. They fit great with Magnum Force suspensions and are the only way to go if you're building a Hemi A-Body. We've even got 'em for the new 5.7 and 6.1 Hemi !
A, B and E-Body Forward Strut Reinforcements for engine compartment triangulation
The best way to increase the front frame's integrity and stiffness on an A, B, or E-body Mopar.
Some publications and TV shows featuring Magnumforce suspension components.
click here for air dates
Episode 10 of Wrecks to Riches - Watch the construction of a 1969 Hemi Dart May 30th and June 1 on TLC and see this suspension being installed.
Keep your eyes out for us in upcoming episodes of "Wrecks to Richs", "Monster Garage", and "Speed Shop"
Mopar Collectors Guide - Three of the "Top Ten Mopars for 2005" Use Magnumforce Suspension and Chassis Components
Mopar Collectors Guide Sept. 99 - Magnumforce Tubular K-Member Conversion. Build Book Featuring Joe Rogans "Sick Fish" Cuda. Extensive coverage of Magnumforce Suspension Installation Mopar Muscle Feb. 2006 Pg.51 "Corner, Hook, and Whoa" Bring your Mopars handling into the 21st Century. Mopar Collectors Guide "Top Ten Aftermarket Parts for 1999". Magnumforce Tubular K-Member Conversion. Featured in Mopar Action Magazine June 2001 pg. 21 "Shock Treatment" Check out the General Lee project that Romine Video is building using Magnumforce Components ! Mopar Muscle July 2003 Tubular K-Frame Tech Article pg.76 Mopar Collectors Guide Feb. 2003 page 60 Top ten products of 2002 A-Body tubular k-member conversion Hot Rod Magazine - Article by Steve Magnante - "Lose weight now" "Installing the Magnum Force Mopar Tubular K-Frame Conversion Kit"
Car Craft Magazine - Aug. '99 pg.90 "Bad Ass Speed Parts You've Never Seen"
Mopar Action - Aug. '99 pg.8 Tech article by Rich Ehrenberg. Tubular upper control arm fix for Mopars
Too much work? Install these tubular upper control arms for improved caster and camber adjustability......especially helpful on lowered Mopars!!!!
Other cars running Magnum Force tubular front suspensions
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Return Policy: We here at Magnum Force will make every effort possible to ensure all of our customers get the correct and highest quality components with the best advice available. In the event an item still needs to be returned please take note of these considerations.
Please call or e-mail us first for a return authorization number. (Perhaps we can find you the correct item instead). Packages will not be delivered without this number present.
No returns on special order or custom fabricated parts. Such as, but not limited to rearend assemblies, etc.
Returns must be in as new condition in original packaging.
No returns after 30 days. Items that have been used, installed, modified, or altered cannot be returned. Items subject up to 30% re-boxing or re-stocking fee and shipping costs cannot be refunded.