The GM overdrive transmission swap has been covered ad nauseam, and to be fair, it's an incredibly straightforward swap for anyone who's even done the most basic of hot rodding—that's why we love it.

The 4L60E and 4L80E are two of General Motors’ most discussed automatic transmissions, and the choice between them shapes how a truck, SUV, or LS swap behaves on the street and under heavy load. Both ...