21Aug2026
Ol' Cotton's Tremec transmission swap isn't going exactly to plan. A hydraulic leak and exhaust clearance issues put our Silverado through one more round of repairs.
Ol’ Cotton is finally getting its Tremec Magnum 6-speed. Follow along as we tackle the install and run into an unexpected problems.
Planning a manual conversion? This Swap Parts List breaks down the components needed to install a Tremec Magnum 6-speed in a GMT800 truck.
The TREMEC Magnum is often mistaken for the original T-56, but they're far from identical. Here's what separates these two popular six-speed transmissions.

