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Weld-On Rear Disc Brake Kit, 1978-88 GM Caliper, 3 Inch Backspace

Price:$259.99
Metric Complete Rear Disc Kit, 3" Back Space
Price:
$259.99
KT
In Stock
Item #:
91031931
Open Kit Components
- Selection of individual components may be necessary for kit purchase.
Kit Components
1978-Up GM Caliper Bracket - 3" Tube
Item #:
91641010
2
  Show Specifications
  • 91641010
    Centerline of Holes
    5.500" (5 1/2")
    Overall Thickness
    0.180"
    Tube O.D.
    3.000"
    Material Type
    Steel
    Finish
    Painted
    Sold in Quantity
    Each
    Notes
    When welding this bracket to the housing, it must be welded square or parallel to the rotor face or it will bind/break the caliper and bracket.
Speedway Pro-Lite Vented Rotor, 11.75" x GM .81", 8 x 7 Thru
Item #:
91031906
2
  Show Specifications
  • 91031906
    Outside Diameter
    11.750" (11 3/4")
    Overall Thickness
    0.810"
    Bolt Pattern
    8 on 7"
    Material Type
    Carbon Iron
    Vented Rotor
    Yes
    Sold in Quantity
    Each
Stamped Steel Brake Hat, 3" Offset
Item #:
91031904
2
  Show Specifications
  • 91031904
    Outside Diameter
    7.500" (7 1/2")
    Inside Diameter
    3.050"
    Overall Thickness
    0.100"
    Wheel Backspace
    3"
    Material Type
    Steel
    Finish
    Painted
    Sold in Quantity
    Each
    Notes
    This has 5x5, 5x4.75, and 5x4.5 bolt pattern, clearance ID 5.83"
Rotor to Hat Bolts
Item #:
8352500071
Hat Thickness: 1/8
2
GM Caliper Slider Bolt
Item #:
8352300542
4
  Show Specifications
  • 8352300542
    Material Type
    Steel
    Overall Length
    4.375" (4 3/8")
    Wrench Type
    Allen
    Under Head Length
    3.375" (3 3/8")
    Sold in Quantity
    Each
    Notes
    7/16-20 Thread
Speedway 156 '78-Up Metric Brake Pads
Item #:
9191562
Item Details:
Aluminum/Steel rotors, best pad for aluminum rotors, low metallic, long life, excellent street
2
  Show Specifications
1978-88 GM Metric Caliper
Item #:
91031045
Item Details:
7/16"-20 Inlet
5 1/2" mount spacing
Side: L
1
1978-88 GM Metric Caliper
Item #:
91031045
Item Details:
7/16"-20 Inlet
5 1/2" mount spacing
Side: R
1
Instruct Sheet-Brake Kit
Item #:
910319INST
1
 
(2 Ratings)
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Replace those old drum brakes with modern rear disc brakes. Mounts .81" x 11-3/4" Pro-lite vented iron rotors and calipers to 3" tube rear end. Complete with rotors, hats, metric calipers (7/16"-20 inlets), brackets, brake pads, caliper brackets and slider bolts. 

Steel hat fits 5 lug hubs with 4-1/2", 4-3/4", or 5" bolt circle.

910-31931 Instructions (PDF)

  • Caliper Brackets (2)
    • Weld onto a 3" axle tube
  • Rotors (2)
    • GM-style .81" x 11-3/4", 8 on 7" bolt pattern
    • Straight vanes, 8 lbs. each
  • Rotor Hats (2)
    • Stamped steel, 3" backspace
    • 3.06" center hole, 6-1/4" I.D., 1/2" stud holes, 2 lbs.
  • Rotor Bolt and Nut Kit (2)
  • Caliper Slider Bolts (4)
  • Brake Pads (2 sets)
    • Street compound, little metallic, long rotor and pad life
  • Calipers - 1978-88 GM Metric (L & R)
    • 7/16"-20 inlet
    • Cast iron body, 2.38" single piston
    • Saves 3.5 lbs. per side compared to '69-'77 GM calipers
Reviews for Item #: 91031931
REVIEWED BY 2 CUSTOMERS
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does a great job

By elcomeano from Fostoria, OH on 2/6/2011
Pros:
Decreased Stopping Distan, Lightweight, No Fade
Car & Truck:
Competitive Driver
Bottom Line: Yes, I would recommend this to a friend

used this item on my drag car... I did have to grind on the caliper so the wheel didn't hit it.

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all in all a good kit

By mean green from chehalis wa on 9/2/2011

the only issue i had with this kit is that it was missing some of the clips for the pads.

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Questions and Answers for Item #: 91031931

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Q:

Can this rear disc brake fit a 1974 Vega with 5 lug 4 3/4 inch axle? Does it come with a parking brake and can the disc /calipers be reduced to 9 or 10 inch disc?

Asked on 8/10/2011 1:32:29 PM by from

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