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#91031923
GM 7.5 Inch 10 Bolt Bolt-On Rear Brake Kit
- If you don't want to spend an arm and a leg on a rear disc brake kit but want the ease of a bolt on system then this is the kit for you!
- Fits GM 7.5" 10 bolt rear ends such as found in 1978 to 1988 G body cars
- Includes two bolt-on caliper brackets, two vented rotors, two new GM metric calipers and hardware
$365.99
/kit
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Product Summary
GM 7.5 Inch 10-Bolt, Rear Position, Vented Rotor Type
- If you don't want to spend an arm and a leg on a rear disc brake kit but want the ease of a bolt on system then this is the kit for you!
- Fits GM 7.5" 10 bolt rear ends such as found in 1978 to 1988 G body cars
- Includes two bolt-on caliper brackets, two vented rotors, two new GM metric calipers and hardware
- Rotors have 5 on 4-3/4" BOLT PATTERN
- Fits axle with a maximum flange diameter of 6-1/4" OD and brake register size of 2.78" or smaller
Comes as a Kit
View Kit Components
Key Specs
| MFG. Part # | 91031923 |
| Position | Rear |
| Wheel Bolt Pattern (in.) | 5x4.75 in. |
| Wheel Bolt Pattern (mm) | 5x120.65 mm |
| Rotor Diameter | 11.25 Inch |
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Speedway Motors 91031923 Details
If you dont want to spend and arm and a leg on a rear disc brake kit and still have to weld the bracket on, weve got you covered. This kit includes two bolt-on caliper brackets, two 11-5/8" vented rotors, two GM metric style calipers, brake pads and hardware.
- 5 on 4-3/4" bolt circle
- Fits over an axle with a maximum flange diameter of 6" O.D.
- 2.872" rotor center hole
- Requires a minimum 14-5/8" I.D. for caliper clearance
- Brake calipers feature 7/16"-20 inlet thread
Item Details
With Non-Emergency Brake Calipers
Charts
910-31923 Instructions (PDF)
Speedway Motors 91031923 Specifications
Speedway Motors 91031923 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031923 |
| Brand | Speedway Motors |
| Position | Rear |
| Wheel Bolt Pattern (in.) | 5x4.75 in. |
| Wheel Bolt Pattern (mm) | 5x120.65 mm |
| Rotor Diameter | 11.25 Inch |
| Rotor Type | Vented |
| Caliper Pistons | One |
| Caliper Finish | Natural |
| Parking Brake Provision | No |
| Minimum Recommended Wheel Diameter | 15 Inch |
| Rotor Shape | Round |
| Hardware Included | Yes |
| Rotor Style | Plain Face |
| Front Rotor Included | No |
| Front Caliper Included | No |
| Rear Caliper Included | Yes |
| Front Spindles Included | No |
| Master Cylinder Included | No |
| Brake Booster Included | No |
| Brake Hoses Included | No |
| Rear Rotor Included | Yes |
| Bolt Pattern | 5 on 4.75" |
| Finish | Natural |
| Color | Natural |
| GENERAL | |
| Sold in Quantity | Kit |
| Notes | Includes rotors, calipers, caliper brackets, brake pads, rotor spacers, and hardware. |
| Rotor Thickness | 0.78" |
| Rotor I.D. | 2.78" |
| Rotor Backspace | 1.75" |
| Rotor Material Type | Cast Iron |
Ratings & Reviews
4.4
12 Reviews
Customers highlight the product's practicality and high quality with many willing to repurchase. Despite some discrepancies in tech-support instructions, users confirmed that the kit is fully compatible with Grand National 8.5" rear and G-Body 7.5" rear, even accommodating modified 15x10" wheels. The kit features straightforward installation, with few and manageable modifications required. It conveniently replaces drum brakes, even in G-Body/Metric cars, utilising only basic hand tools. Some critics indicate, however, that the set may bend under high pressure and brake hoses are sold separately. The recommended rotor measurement may need adjustment for a perfect fit. These notwithstanding, the product largely draws praise for its performance and usability.
Ratings & Reviews
4.4
12 Reviews
Customers highlight the product's practicality and high quality with many willing to repurchase. Despite some discrepancies in tech-support instructions, users confirmed that the kit is fully compatible with Grand National 8.5" rear and G-Body 7.5" rear, even accommodating modified 15x10" wheels. The kit features straightforward installation, with few and manageable modifications required. It conveniently replaces drum brakes, even in G-Body/Metric cars, utilising only basic hand tools. Some critics indicate, however, that the set may bend under high pressure and brake hoses are sold separately. The recommended rotor measurement may need adjustment for a perfect fit. These notwithstanding, the product largely draws praise for its performance and usability.
4.4
12 reviews
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Most Liked Positive Review
4.0
Great product but have to order brake hoses seperate
Everything was going smoothly on rear disk brake install. Until I got to the part of instructions where it said "install brake hoses and bleed system". There was no brake hoses in any of the boxes. Called speedway and tech support informed me that the brake hoses I need are sold separately. Sure would have been nice to know that when I ordered kit. Now I'm waiting another 4 or 5 days for ups truck. 😠
Most Liked Negative Review
3.0
Installation Notes INCORRECT
The Rotor you recommend says from a 93 to 97 Camaro, Well that Rotor is 4.65 bolt circle and the 10 Bolt G-Body 84 Monte Carlo is a 4.75 bolt circle. The correct Rotor is from a 92, v8, Camaro which is 4.75 bolt circle and 296 mm or 11.65 inches.
Filter by Ratings
Good Product
4.0
a year ago
papiaaron
CT
Verified
Good product but took me a couple times to install and had to drill rear END BOLT holes bigger
Would Recommend
I would buy again
5.0
3 years ago
Sam
Fridley mn
Verified
Nice kit no guessing
Would Recommend
Excellent product
5.0
4 years ago
1979Elco
Siloam, NC
Verified
Tech support said this would not work on a Grand National 8.5" rear, but the GN 8.5" rear has the exact same axle mounting for the read brakes as the G-Body 7.5" rear and it worked perfectly. Info says to use 16" wheels as they will not clear 15", but with some slight modifications got it to work with 15x10" wheels.
Would Recommend
Descent set
3.0
4 years ago
1234
Eau Claire WI
Mounting brackets bent under high pressure application. One of the rotors was bent beyond use.
Would Recommend
Great product but have to order brake hoses seperate
4.0
5 years ago
James Cockerham
Vidalia Louisiana
Verified
Everything was going smoothly on rear disk brake install. Until I got to the part of instructions where it said "install brake hoses and bleed system". There was no brake hoses in any of the boxes. Called speedway and tech support informed me that the brake hoses I need are sold separately. Sure would have been nice to know that when I ordered kit. Now I'm waiting another 4 or 5 days for ups truck. 😠
Would Recommend
Yes.
5.0
6 years ago
G.W.
A . J. Az.
Verified
I love doing business with you 90% of my rod was built from the Speedway cat. seven years!
Would Recommend
I would buy this part again...
5.0
7 years ago
Kruff75
Missouri
Verified
Buy you will not regret it
Would Recommend
Installation Notes INCORRECT
3.0
10 years ago
Interceptor
Shreveport, La
Verified
The Rotor you recommend says from a 93 to 97 Camaro, Well that Rotor is 4.65 bolt circle and the 10 Bolt G-Body 84 Monte Carlo is a 4.75 bolt circle. The correct Rotor is from a 92, v8, Camaro which is 4.75 bolt circle and 296 mm or 11.65 inches.
Would Recommend
Great product! Easy installation
5.0
10 years ago
Lowman
Portales, NM
Verified
I was missing a couple of items in the kit, Speedway sent me the missing pieces quick! I will definitely continue working with this company!
Would Recommend
Works great
5.0
10 years ago
Zach
Rochester NY
Verified
Bolts right up, easy to install with minimal modifications to the original axle flange. Rotors need to be drilled out to fit larger 5/8'' studs.
Would Recommend
Showing 10 of 12 reviews
Questions & Answers
Questions & Answers
23 Questions • 11 Answers
Does this product work for a 1977 Oldsmobile Cutlass Abody with a 10 bolt gm rear rand and 5 ON 4 3/4 w
by Bryar
• 2 years ago
1 answer
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Will this kit install on a Gbody 8.5 rear end out of an 87 grand national?
by Minedog
• 7 years ago
2 answers
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Will the 11 5/8" rotor and caliper clear a 15" Weld Draglite wheel? If not can an 11" rotor be substituted and fit the caliper?
by Mck
• 8 years ago
1 answer
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Does this kit change the rear track width at all?
by Kyle
• 8 years ago
1 answer
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i have this kit on a 7.5 rear end swapped into a project. what needs to be done with the original master cylinder to run the discs in the rear? i have bled the brakes and the pedal is soft. i assume because the rear m/c is set up for drums. please advise. thankyou!
by Zane
• 9 years ago
1 answer
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Would this work on a 1985 El Camino? I saw the question about the 1980 but does my 1985 need different rear brake lines than part #6178564? Thanks.
by Zachary
• 9 years ago
1 answer
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The part details lists the caliper fitting as 7/16"-20 thread, but the instructions call out 10mm x 1.5 thread. Which is correct for the none E brake version?
by Senior31
• 9 years ago
1 answer
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Do you sell a similar with with rotors drilled for 5/8 studs, or better yet, with 5/8 studs already installed? Thanks.
by Travis
• 9 years ago
1 answer
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Will I have to purchase a brake line kit as well? If so, what's the part number on the kit?
by Rob
• 9 years ago
1 answer
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will this fit my 1980 El Camino? If so what brake hoses do i need to go with this kit?
by Rogue
• 9 years ago
1 answer
View Answer
10 of 23 questions shown