IMCA and USRA Stock Car approved race ready GM Metric chassis available in front, rear, or complete kit, All new frame sections feature approved modifications already made for you, saving fabrication time, Front and complete frame kits include midframe rails (requires welding), Rear frame kit includes control arm mounts stitch welded (requires finish welding), New frame sections assemble easily with engineered alignment holes and dimple stops 78-88 GM Metric Chassis Stock Car Frame, Rear Sku # 91678880-REAR Mfr. Part # 91678880-REAR Condition New Brand Speedway Motors Sold Kit Details
- All new GM Metric frame sections, eliminates the need to search for & stockpile core frames
- Eliminates the need to disassemble, weld & repair core frames
- IMCA and USRA approved
- Stronger, more consistent product with more performance
- Available as front, rear, or complete front/rear frame kit
- Race-ready modifications already made to frames
- Identical dimensional specs to 78-88 GM Metric frame mounting points
- .118-inch thick mild steel front frame rail sections
- .120-inch thick mild steel rear frame rail sections
- .095-inch thick 2x4 midframe rails (included with front frame and complete frame kits only)
- Front and rear frames feature dimple stops and alignment holes for assembly and welding ease
Don’t Build Your Next Stock Car With a 30-Plus-Year-Old Frame
With the last production GM Metric chassis frame hitting the road in 1988 it is no doubt getting tougher to find a suitable chassis for a competitive Stock race car build. Rust, accident damage, and more claim these GM Metric chassis frames every day. Our IMCA and USRA Stock Car rules approved GM Metric chassis Stock Car frame is the perfect answer to your next Stock Car chassis build! It is available as a weld together front frame stub (with midframe rails included), weld together rear frame stub, or complete weld together frame kit (front stub, rear stub, and midframe rails), perfect for Stock Car chassis builders.
Designed in-house at Speedway Motors, these new mild steel frame stubs solve the growing problem of trying to source good used GM Metric chassis frames for your Stock Car builds. These are designed around factory frame dimensions, yet most of the modifications and updates you would have to make to a stock frame are already expertly handled and approved by IMCA and USRA Stock Car rules. This includes shortened front and rear frame horns, front crossmember “duckbill” removed for additional steering linkage clearance, and much more! Final assembly and welding are all that is required for Stock Car chassis builders and the alignment holes and dimple stops make welding everything together quick and easy. Start your next Stock Car chassis build with a Speedway Motors frame or use the front or rear stubs to update your current Stock Car build and ditch that twisted, rusty mess of a frame you’re using now.
Benefits for the chassis builder:
- Eliminates the need to search for & stockpile core frames
- Eliminates the need to disassemble, weld & repair core frames
- No more trips to-and-from the sandblast shop
- Repeatable, easy assembly resulting in cost savings
Benefits for the racer:
- Reduced lead time from your chassis builder
- Stronger, more consistent product with more performance
Improvements over using a stock 78-88 GM Metric frame:
- Unneeded holes from the stock configuration have been removed or filled
- Bumper mounts removed
- Front and rear frame horns shortened, saving fabrication time
- Removed front crossmember duckbill for added steering linkage clearance
- Alignment holes for crossmember and lower control arm mounts for quick assembly
- Dimple stops in the frame to accept the mid rails, ensuring proper alignment
Front and rear frame fitment data:
- Front frame section features .118-inch wall thickness
- Rear frame section features .120-inch wall thickness
- Rear lower control arm mounts are stitch-welded, requiring full welding for installation
- Midframe rails (included with front frame and complete frame) feature .095-inch 2x4 boxed construction
This frame accepts all common Stock Car chassis, suspension, and driveline parts, including:
- Hobby Stock Upper Control Arm Kit
- Hobby Stock Metric Rear Control Arm Kit
- Hobby Stock Front Spindle And Rotor Kit
- Hobby Stock 9-Inch Floater Axle Kit
- Hobby Stock Roll Cage Kit
Note: NOT for street use. These frame sections are for Stock Car or Hobby Stock racing use only. No provisions for factory GM Metric chassis bumper mounts or other factory use is intended.
Specs Position Front/Rear Material Type Steel Finish Natural Gauge Thickness .118-inch FR.120-inch RR Color Natural Reviews Top of the line frame Rated by Johnson on October 06, 2025
Summary: This frame was delivered faster than estimated. No dings or dents and it looks fresh. Welds look great and no rust. You can definitely tell this wasn't pull out of grandmas backyard. Will update in a few months once car is built how it holds up.
Yes, I recommend this product.
Quality is great Rated by Johnson on October 01, 2025
Summary: This will be built into a stock car. This frame is definitely not out of your grandmas backyard. Super easy and all parts are there. Will add another review after we've raced it.
Yes, I recommend this product.
Great product! Rated by Tod on September 25, 2025
Summary: Great to work with. No more junk yard stuff!
Yes, I recommend this product.
No Rated by Joe Schmit on December 13, 2024
Summary: It needed some directions on lining up and the rear crossmember
No, I would not recommend this product.
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