1947-54 Chevy Pickup Front Suspension/Brake Kit, M-II/Rack Steer
47-54 GMC, 47-54 Chevy, IFS Front Suspension Type, Stock Height Suspension Height Adjustment
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Details
Info
As featured on our 1952 Chevy Pickup for Classic Truck’s Week to Wicked. Watch the transformation here!
Kit Includes:
- (1) Heidts SB-054 Mustang II Stabilizer Sway Bar Kit
- (1) Bolt-In 1947-54 Chevy Pickup Mustang II Crossmember
- (1) Set of Standard Tubular Control Arms
- (1) Set of Coilover Shocks with Springs
- (1) Pair of Stock Spindles
- (1) Mustang II Coil Spring Ride Height Adjuster Kit
- (1) Mustang II Power or Manual Rack & Pinion
- (1) GM Metric 11 Inch Disc Brake Kit
Spindles
- Heat treated forged steel spindle that retains stock factory geometry
- Direct replacement for 1974-1980 Pinto/Bobcat and 1974-1978 Mustang II
- Uses all stock rotors, bearings, calipers, etc
- Stock height
Coilover Shocks with Springs
- For unmatched ride quality for the street and strip, turn to QA1’s Mustang II Coil-Over Shocks
- Stock appearance
- Steel Body
- Simple bolt-in installation
- Coil-Over Capable
- Adjustable ride height
- Mount is Stock 7/16" I.D. Bolt Hole, Bushing
- Chrome silicon spring material
- 8 1/8" free length
- Polished & chrome plated finish
- Choose your desired spring rate
Calipers
- Stock replacement single piston Metric calipers
- Standard equipment on 1978-88 GM mid-size cars (Cutlass, Grand Prix, Regals, Monte Carlo, etc.)
- Feature a 2.375" single piston, shielded bottom inlet
- Will save 3-1/2 lbs. per side compared to mid-size 1969-1977 caliper
- No core charge required
- 7/16"-20 inlet
- 5-1/2" Mount Spacing
- Utilizes GM metric style D154 brake pads
Brake Pads
- Speedway soft brake pad for GM Metric 1978-Up
Tech Tip: Only use full metallic pads on coated rotors.
Learn how to properly Bed-In your brake pads by reading our tech article. Bedding-In Brake Pad Procedure.
Rotors
- Vented stock 11" diameter brake rotors for 1974-1980 Mustang II, Pinto, or Bobcat spindles (or popular GM Metric calipers and brackets)
- Brake rotors are new, not plugged or re-drilled
- Has a 5 on 4-3/4" bolt pattern with corresponding 7/16" diameter fine thread wheel studs
- 5 on 4.75" Bolt circle
- Granada type rotor
Control Arms
- Stock Width
- For Coil-Over Shock
- Upgrade to a cleaner looking control arm
- Full .120" wall, 1" diameter fixture welding tubing
- Features screw-in ball joints and no-squeak bushings
- Works with nearly any stock or aftermarket crossmember
- Welding may be required on some applications
- Designed to correspond with coil-over style springs and shocks
- Works with Mustang II crossmembers that come without lower A-Arm tabs
- Non-strut rod applications
Crossmember
Our bolt-in Mustang II suspension kit for 1947-1954 Chevy half-ton and 3/4 ton pickups includes all hardware and instructions.
- Completely bolt in - no welding required
- Based on proven Mustang II geometry
- Complete with bolt in boxing plates to reinforce the frame
- Interlocking design for ultimate strength
- Threaded adjusters to fine tune ride height
- Full lower A-arms required with this crossmember (strutless type)
- Requires the use of a power rack and pinion and tubular control arms
- NOT for use with air ride
Parts List (PDF)
Note: Use bolt-in motor mount kit 910-54754 to mount your S/B Chevy.
Sway Bar
- For 1947-54 Chevy pickups
- Includes urethane mount and end-link bushings
- For use with tubular arms that include end link mounting tabs
- Hardware included
- Used in conjunction with standard width lower control arms
Steering Rack
- Fits aftermarket Mustang II crossmembers
- Available in manual or power steering
- Mount bushings are included with the Power version, but mount bushings are NOT included in the Manual version
MANUAL:
- New manual rack and pinion steering assembly for Pinto/Bobcat/Mustang II based front suspensions in street rods and kit cars
- 9/16"-26 spline input shaft
- 16" mount centers
- We suggest the Sweet brand u-joint 910-3247 or 910-3227
- The Unisteer U-joint tends to run big on this joint
- Features 14mmx1.5 thread for inner rack extensions, # 910-34345-MAN suggested
POWER:
- New power rack modeled from the 1982-88 T-bird design which will work with aftermarket Mustang II crossmembers
- Bushings included
- (Can be used with a Saginaw GM power steering pump without any additional valves or inline pressure regulators)
- Overall width is 45-1/8" with 15-1/2" mount centers
- Must use offset bushings (910-34342) to mount to original Mustang II crossmembers
- 3/4"-36 spline input shaft
- Uses 910-4047 -6AN adapter fittings
- Rack has 9/16"-18 female o-ring high pressure inlet and 5/8"-18 female o-ring low pressure outlet return line threaded ports
- Replacement sku for rack and pinion hard lines is 910-35344
Tie Rods
- Outer tie rod and inner extension fits left or right, attaches steering rack to spindle
- Fits both manual Mustang II and 1982-1988 T-Bird power racks
- Replacement boot available as # 910-913101
- Cast steel construction for strength
- Grease zerk for service as needed
- 9/16"-18 R/H female thread
- 3.40" long from stud centerline to end
- All new hardware for a complete install
Notes
Spindles
- The Mustang II spindle has been used in street rod applications for years. As such, many brake kits have been developed for them. One can get kits with rotors of 9-1/2", 10", 10-1/2" or 11".
- Caliper choices are full size GM, orginal Ford, GM Metric or Wilwood. Bolt patterns are available in 5 x 4-1/2", 5 x 4-3/4", and 5 x 5".
- The biggest brake kit we offer for this spindle is #91031943, with 1969-1972 Chevelle 11" rotors, full size calipers and standard Chevy 5 x 4-3/4" bolt pattern.
Control Arms
Why go with tubular control arms? The most obvious reason is the looks. Tubular control arms and strut rods give your hot rod a much cleaner and hi-tech appearance than the stock type do. Another bonus is that the tubular control arms are available in 5/8" narrower than stock, which helps tuck the wheels up under the fenders without having to buy expensive special offset wheel. When using 5/8" narrower control arms, 1" must be removed from each inner tie rod end.
Crossmember
This bolt in unit is ONLY made to fit a 47-54 Chevy 1/2 ton and 3/4 Pickup chassis. Inside dimension at axle centerline is 23-1/2", outside is 28". This frame is slightly tapered to the front. Standard MII spindles will set pin at 1/2" below frame rail and 2" drop will set it at 1-1/2" above. Track width is standard 56-1/2" depending on which brake kit is used.
Steering Rack
- The Power Steering unit has 5/8" and 9/16" O-ring style ports. If you have an inverted flare fitting on your existing lines, that will not work.
- The Power Steering unit can be used with our standard GM pumps 91032922-GM, 91032908-BLK & -CHR, and with hose kits 910-32535 and 617-4835.
- Applicable Bump Steer Kit # 721-BAX102 now available when application may require.
Proper Break-In Procedure for Steel or Cast Iron Rotors
New steel/iron rotors should be bedded in before being used in racing conditions. Proper bedding will prepare the rotor surface, prolong the rotor's life, and make it more resistant to thermal checking or cracking under severe braking conditions. The following procedures should be performed when bedding in both steel and cast iron rotors. It is best to bed in a new rotor using a used set of pads, preferably ones which will not create heat rapidly. Generating heat too rapidly will thermal shock the rotors. Likewise, when bedding in a new set of brake pads it is best to perform the process on a used rotor. This new/used bedding process permits controlled bedding of each individual component.
Make sure rotor surfaces are free from oils, grease, and brake fluid. Run vehicle up to a moderate speed and make several medium deceleration stops to heat up the rotor slowly. This will help reduce the chance of thermal shock caused by uneven heating of the rotor. Pull into the pits and allow the rotor to cool to ambient air temperature. Care should be taken not to ride the brakes into the pits as this may hot spot the rotor causing premature wear to the surface or structural damage.
Charts
910-34307 Instructions (PDF)
Brake Pad Brand Guide (Link)
910-35335 Tubular Lower Control Arm Instructions (PDF)
910-35320 Tubular Upper Control Arm Instructions (PDF)
Tubular Control Arms Application Chart (GIF)
Tubular Control Arm Chart (GIF)
Mustang II Manual Rack Bolt Kit Installation Instructions
910-44754 Instructions (PDF)
Spring Rate Chart (Link)
Related Products
What's In The Kit
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Speedway Mustang II Stock-Height Steel SpindlesPart # 91034307Qty x 1
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QA1 MS303 Front Pro Coil single adj. Mustang II Mount ShockPart # 721MS303Qty x 2
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Replacement Springs for Mustang II CoiloversPart # 2558MQty x 2
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QA1 Pin Cross 0.750" O.D.Part # 2559035143Qty x 2
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Mustang II Power Steering and Manual Rack & PinionsPart # 91034340Qty x 1
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Speedway Mustang II Steering Rack & Pinion Mounting BushingPart # 91034341Qty x 2
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Mustang II Outer Tie Rod End, Manual VersionPart # 91034316-MANQty x 2
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Pinto-Mustang II Spindle Nut & Washer KitPart # 910615074Qty x 1
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GM Metric Caliper Bracket Set for Mustang II SpindlePart # 91631914Qty x 1
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IMCA Approved 1978-88 GM Metric RH Brake Caliper, 7/16-20 InletPart # 91031045-RQty x 1
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IMCA Approved 1978-88 GM Metric LH Brake Caliper, 7/16-20 InletPart # 91031045-LQty x 1
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Speedway Soft Street Brake Pads, GM Metric 1978-Up D154Part # 9193381Qty x 1
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11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric CaliperPart # 91031070Qty x 2
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Bearing-Seal Kit for Two Mustang II Brake RotorsPart # 91031000Qty x 1
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Speedway Mustang II Tubular Lower A-Arms for Coilovers, No Strut RodPart # 91035335Qty x 1
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Speedway Mustang II Upper Control Arm T-BoltsPart # 91034310-2Qty x 1
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Mustang II Rack & Pinion Bolt KitPart # 91034342-2Qty x 1
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9/16 Inch Fine Thread Tie Rod NutsPart # 91034Qty x 1
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Speedway Mustang II Coil Spring Rubber Isolator CushionPart # 91034343Qty x 1
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Mustang II Rack & Pinion Bolt Kit - For Use With Rack SpacersPart # 91034342-3Qty x 1
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Mustang II Rack Spacer, 3/4 InchPart # 9101023Qty x 2
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Speedway Mustang II Tubular Upper Control Arms, Stock Width, PairPart # 91035320Qty x 1
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Front Disc Brake Hardware KitPart # 9103141.1Qty x 1
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Bolt-In 1947-54 Chevy Pickup Mustang II CrossmemberPart # 91044754Qty x 1
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Heidts SB-054 Mustang II Stabilizer Sway Bar Kit, 47-54 Chevy PickupPart # 413054Qty x 1
Reviews
Q & A
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Speedway Motors and Classic Trucks joined teams to build a 1952 Chevy truck for the newest Week to Wicked build. Jason and Tom talk about the Speedway Motors Mustang II front suspension kit used on the build.