Speedway Motors GMC Syclone 4L60E Parts

A real-world guide to 4L60 transmission specs, strength, and swap tips.

This resource contains a transmission pan shape ID chart and other tips to help with identifying GM transmissions.

This old sedan was untouchable in the early 60's.

Whether you've never had the chance to see our warehouse or talk to the team at the counter or you've been here a hundred times, check out this behind the scene video.

After years of dominance with the legendary 4x sedan, "Speedy" Bill Smith and his hotshot driver Lloyd Beckman upgraded to this sleek new offset roadster for the '64 season.

Kyle's Vette looks like it was built in a pro shop, but instead it was put together in the home shop with a lot of "hard honest work."

Speedway Motors announced today the introduction of a new IMCA Modified Spec Racing Engine as they kick off the 2025 race season along with discounts Jan. 27-Feb. 2 to help their customers get ready for race season.

The dyno at the Speedway Motors Racing Engine shop is always humming. We set up a camera in the cell to catch a few of the engines that have passed through the door recently.

Mike's Cyclone was a rare bird when it left the factory, and it's led an amazing life since then! Mike's goal is to go 200 at Bonneville in a car that has done Hot Rod Power Tour and has logged a ton of street miles...

Jennifer Helgoth is a painter and prolific builder who has amassed an fleet of Cadillacs, including this '60 Series 62 with one amazing paint job.