Back-Halfs
Transform your race car’s rear chassis and make room for massive slicks with drag racing back-half kits from Quarter-Max. We manufacture high-strength 4130 chromoly and mild steel back-half frame kits, mandrel-bent frame rails, and rear subframe components engineered to optimize suspension geometry, maximize rear-tire clearance, and provide a rock-solid foundation for high-horsepower launches.
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QM 1947-1953 Chevy/GMC Truck Rear End Frame Box-In Kit
Quarter-Max
$103.94This kit includes qty-4 pieces of 11 gauge mild steel plate cut on a water jet to box in the inside rear frame of your 1947-1953 Chevy or GMC truck. Boxing in your rear frame will make your frame...QM-219609$103.94 -
QM 2" x 3" Dropped Crossmember
Quarter-Max
$90.29Fabricating a rear frame on a Pro Street or Drag Race car is easier and looks more professional with a 2" x 3" dropped crossmember. The sturdy 2" x 3" .083” steel crossmember is mandrel bent on CNC...QM-302105$90.29 -
QM 2" x 3" Dropped Crossmember with Ladder Bar Brackets
Quarter-Max
$138.59Fabricating a rear frame on a Pro Street or Drag Race car is easier and looks more professional with a 2" x 3" dropped crossmember. The sturdy 2" x 3" .083” steel crossmember is mandrel bent on CNC...QM-302109$138.59 -
QM 4-Link Round Tube Back-Half Kit
Quarter-Max
$1,126.64Our 4130 round tube 4-link back half kit includes 1-5/8 in. OD x .083 in. W frame rails, 1-3/4 in. OD x .095 in. front crossmember, upper shock mount, and cross bracing. Comes with 1/4 in. pro series...QM-302116$1,126.64 -
QM 4-Link Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130, with Welded Chassis Brackets
Quarter-Max
$776.984-Link Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130 with Welded Chassis BracketsSold in pairs. Brackets are welded to the frame rails. This item will have a discounted oversize fee of $80...QM-301105-1$776.98 -
QM 4-Link Round Tube Welded Back-Half
Quarter-Max
This item ships truck freight only. Please call 309-343-7575 to order.Our 4130 round tube 4-link back-half includes 1-5/8" .083" frame rails, 1-3/4" .095" front crossmember, upper shock mount, and...QM-302114 -
QM Dropped Tubular Crossmember, 1-3/4 in. OD, 3 in. Drop, 4130
Quarter-Max
$178.49Dropped Tubular Crossmember, 1-3/4 in. OD, 3 in. Drop, 4130Specifications:• 3 in. drop center• Width: 54-1/8 in.• Material: 4130• Diameter: 1-3/4 in. OD• Wall thickness: .095 in. wallAlso available...QM-302107$178.49 -
QM Dropped Tubular Crossmember, 1-3/4 in. OD, 3 in. Drop, Mild Steel
Quarter-Max
$94.49Dropped Tubular Crossmember, 1-3/4 in. OD, 3 in. Drop, Mild SteelSpecifications:• 3 in. drop center• Width: 54-1/8 in.• Material: Mild steel• Diameter: 1-3/4 in. OD• Wall thickness: .134 in. wallAlso...QM-302106$94.49 -
QM Dropped Tubular Crossmember, 1-3/4 in. OD, 3 in. Drop, Mild Steel, with Brackets
Quarter-Max
$104.99Our dropped tubular crossmember is the economical solution to add a crossmember and front ladder bar brackets to your project.Dropped Tubular Crossmember with Brackets, 1-3/4 in. OD, 3 in. Drop, Mild...QM-302110$104.99 -
QM Four Link Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130
Quarter-Max
$453.584-Link Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130Sold in pairs. Brackets not included. This item will have a discounted oversize fee of $80.00 when shipped via ground delivery to the...QM-301104-1$453.58 -
QM Ladder Bar Round Tube Back-Half Kit
Quarter-Max
$1,018.49Our 4130 round tube ladder bar back-half kit includes 1-5/8 in. OD x .083 in. W frame rails, 1-3/4 in. OD x .095 in. front crossmember, upper shock mount, cross bracing, and a 180 degree driveshaft...QM-302117$1,018.49 -
QM Ladder Bar Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130
Quarter-Max
$468.28Ladder Bar Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130Sold in pairs. Brackets not included.This item will have a discounted oversize fee of $80.00 when shipped via ground delivery to the...QM-302108-1$468.28 -
QM Ladder Bar Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130, with Welded Chassis Brackets
Quarter-Max
$634.18Ladder Bar Round Tube Frame Rails, 1-5/8 in. OD x .083 in. W 4130, with Welded Chassis BracketsSold in pairs. Chassis brackets are welded to the frame rails.This item will have a discounted...QM-302109-1$634.18 -
QM Ladder Bar Round Tube Welded Back-Half
Quarter-Max
This item ships truck freight only. Please call 309-343-7575 to order.Our 4130 round tube ladder bar back-half includes 1-5/8" .083" frame rails, 1-3/4" .095" front crossmembers, upper shock mount,...QM-302115 -
QM Universal 4-Link Rails
Quarter-Max
$348.58The QM Universal 4-Link Rails is the perfect way to narrow the rear of your chassis to accept extra-wide racing tires. Our frame rails are of universal design, making them adaptable to any car from...QM-301104$348.58 -
QM Universal Ladder Bar Rails
Quarter-Max
$438.88The perfect way to narrow the rear of your chassis to accept extra-wide racing tires. Our frame rails are of universal design, making them adaptable to any car from Pro Street to Drag Race. The...QM-302108$438.88 -
QM Welded 4-Link Back-Half, 2" x 3"
Quarter-Max
This item ships truck freight only. Please call 309-343-7575 to order.Our Welded 4-Link suspension includes frame rails, 2x3 crossmember, Quarter-Max 4-Link Kit # 301101, diagonal link, 180°...QM-302113 -
QM Welded Ladder Bar Suspension Back-Half
Quarter-Max
This item ships truck freight only. Please call 309-343-7575 to order.Our welded ladder bar suspension includes Double Adjustable Ladder Bars #302102, frame rails, 2x3 crossmember, chassis brackets,...QM-302112