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Front Subframe Installation - Car Craft's '71 Dodge Demon

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Front Subframe Installation
Front Subframe Installation

So far, the Demon project looks much cooler than we imagined. We wanted to capture the feel of Don Schumacher poised on the line at OCIR in 1969 in his record-setting Stardust Funny Car. To do this, we tried to adhere to the ethos even while using available parts that weren't as era-correct as they should be. A glaring example of this is the use of ET Gasser wheels instead of Halibrands or spoked Americans that you'd find in the late '60s, or the Cragar SS/T or Center Lines you'd find on this kind of car throughout the '70s. We're also cheap, so instead of spending the $3,400 market price the era-correct rear 15x10 Halibrand mags command, we found a pair of vintage U.S. Indy mags with the right offset for $60 on Craigslist.

We know it's fun to stare, but we don't do trailer queens at CC. This car needs to be both quick on the street and ultra brutal at the track if we are going to live with it. Like salt sprayed on a prewar jalopy from a lap at Bonneville, the runny shoe-polish dial-ins and car numbers on the flimsy plexiglass will be proudly displayed as we cruise Ruby's in Redondo Beach on Friday nights, hopefully with some flame from the turbos licking the primer off the welds.

Front Subframe Installation

That's right, turbo Hemi. And to get the snake pit under the hood, we decided to go full enchilada and hack the front end off the car, replacing it with a Chris Alston 2x3 A-arm front frame system. Because that's what Schumacher would do. In addition to a wicked stance, the subframe kills somewhere in the neighborhood of 300 pounds of excess weight and mates to the existing Chassisworks back half and four-link ready and waiting in the rear.

All you need to get this project done yourself is a flat garage floor, a tape measure, a Sawzall, and a MIG welder. Let's go.

  • Front Subframe Installation
    Last month, we ordered a 3x2x0.083 boxed frame from Chris Alston, which had a 29-inch width and 6 inches of ground clearance. Using the 29 inches as the base, we added 131⁄4 inches for the suspension and another 4 inches for the wheel offset to get the distance from the outside of the wheel and tire to the lip of the front fender.
    Front Subframe Installation
    Last month, we ordered a 3x2x0.083 boxed frame from Chris Alston, which had a 29-inch widt
  • Front Subframe Installation
    Before we removed any parts from the car, we made a mark on the door and measured the distance from it to the front wheel spindle centerline. With that number we had the information to position the new frame under the car and retain the stock wheelbase.
    Front Subframe Installation
    Before we removed any parts from the car, we made a mark on the door and measured the dist
  • Front Subframe Installation
    Our measurement was 25 inches, which we had wisely written on the door. Using that number, we made a new mark on the floor that represents the spindle centerline.
    Front Subframe Installation
    Our measurement was 25 inches, which we had wisely written on the door. Using that number,
  • Front Subframe Installation
    We also measured off the driver side and connected the dots with a green tape line we used to line up the frame.
    Front Subframe Installation
    We also measured off the driver side and connected the dots with a green tape line we used
  • Front Subframe Installation
    The suspension mounts were already welded in place by the guys at Chris Alston. It’s an option we recommend. The frame was long so we could cut it to fit.
    Front Subframe Installation
    The suspension mounts were already welded in place by the guys at Chris Alston. It’s an op
  • Front Subframe Installation
    We cut a template to cap the hole and provide a place for us to butt the new front subframe.
    Front Subframe Installation
    We cut a template to cap the hole and provide a place for us to butt the new front subfram
  • Front Subframe Installation
    In this photo you can see both caps and where we intended to weld the new frame along the inside of the old one.
    Front Subframe Installation
    In this photo you can see both caps and where we intended to weld the new frame along the
  • Front Subframe Installation
    This was the tricky part: Knowing where we were going to butt the frame, we needed to make a new measurement of the distance from the spindle centerline to the face of the plates on the crossmember. Having a tape line in both positions makes this measurement easier.
    Front Subframe Installation
    This was the tricky part: Knowing where we were going to butt the frame, we needed to make
  • Front Subframe Installation
    Measure twice, cut once.
  • Front Subframe Installation
    The next measurement is the height of the framerail from the ground. Chassisworks provides a blueprint with each frame, which has this information. We measured from the ground to the bottom of the steering rack mounting bracket and from the top of the frame to the ground and compared the numbers with the blueprint.
    Front Subframe Installation
    The next measurement is the height of the framerail from the ground. Chassisworks provides
  • Front Subframe Installation110700 DEMN 13Jpg1302564693313117 JPG
    Here, the frame is mocked in position and supported at the correct height.
  • Front Subframe Installation
    Before we tacked the frame in place, we mounted the front fenders for one final check.
  • Front Subframe Installation
    Here you can see the 4-inch distance from the fender lip to the outside of the wheel and tire.
    Front Subframe Installation
    Here you can see the 4-inch distance from the fender lip to the outside of the wheel and t
  • Front Subframe Installation
    Using the tape line as a guide, we made sure the wheel sat in the correct position in the wheelwell.
    Front Subframe Installation
    Using the tape line as a guide, we made sure the wheel sat in the correct position in the
  • Front Subframe Installation
    By midnight, we decided to take a break. We ordered the pizza using an iPhone and tracked its progress as it was checked for deliciousness and delivered to the new shop. That is a Boddingtons that Grant Peterson’s drinking.
    Front Subframe Installation
    By midnight, we decided to take a break. We ordered the pizza using an iPhone and tracked
  • Front Subframe Installation
    Back to work, we double-checked to see if the frame was square by measuring diagonally from the frame to the body in several places.
    Front Subframe Installation
    Back to work, we double-checked to see if the frame was square by measuring diagonally fro
  • Front Subframe Installation
    After we were satisfied that the frame height was correct and everything was centered in the car, we tack-welded the frame to the crossmember.
    Front Subframe Installation
    After we were satisfied that the frame height was correct and everything was centered in t
  • Front Subframe Installation
    We also welded a connecting plate from the base of the rollcage to the subframe, capping the ends of the framehorns.
    Front Subframe Installation
    We also welded a connecting plate from the base of the rollcage to the subframe, capping t
  • Front Subframe Installation
    This photo illustrates how we connected the subframe to the transmission crossmember.
  • Front Subframe Installation
    The final step was to add a plate of steel that tied everything together.
  • Front Subframe Installation
    Coming next month: suspension, wheels and tires, and an eBay Hemi.
Parts
DescriptionSourcePNPrice
Drag Race A-arm suspension and frame clipChris Alston’s ChassisworksPKG H$1,398.00
Gasser ET wheelsSpeedway Motors91058672$279.00
SOURCES
Chris Alston's Chassisworks
8661 Younger Creek Drive
Sacramento
CA  95828
916-388-0288
www.cachassisworks.com
Glasstek
Naperville
IL
630-978-9897
www.glasstek.com
eBay Motors
www.ebaymotors.com
Coker Tire
13187 Chestnut Street
Chattanooga
TN  37402
423-265-6368
www.cokertire.com
Miller Electric
1635 W. Spencer Street
Appleton
WI  54912
920-734-9821
www.millerwelds.com
Speedway Motors
340 Victory Lane
Lincoln
ME  68528
800-979-0122
www.speedwaymotors.com
Lincoln Electric
22801 St. Clair Ave
Cleveland
OH  44117
216-481-8100
www.lincolnelectric.com
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