Common Problems with the Chevy Blazer 4L60E Transmission. 1) Harsh 1-2 Shift. A common problem with the Chevrolet S-10 Blazer 4L60E transmission is an abrupt 1-2 shift, delayed engagement of a gear, or a shudder / loud shaking from the transmission at low speeds. Mar 07, 2018 · Working on a project car and have a 4L60E transmission. Had test driven it before and was shifting fine. Added an external transmission cooler and test drove it about 2 months later and now not getting a 2-3 shift. It seems like the gear went into neutral. Came back checked the fluid and was on the cold end of the stick.