Bolt Size Matters in Transmission Repair: A Crucial Lesson

At Dail Transmissions, a 2017 Chevy Traverse with a 3.6L 6T70 powertrain came in for a rebuilt transmission. During the process, a worn clutch drum assembly was replaced, and air checks confirmed proper function—until the transmission fluid heated up. The vehicle then lost reverse and third gear.

Upon reinspection, the issue was traced to the replacement ring tower. The shop had unknowingly installed a Generation 1 tower using Generation 2 bolts. While the parts seemed identical at first glance, the mismatched bolts bottomed out prematurely, causing a slight but crucial gap. The transmission functioned when cold but failed under operating temperatures.

The problem was resolved by sourcing the correct Generation 2 tower. This serves as a vital reminder that even small differences in bolt length and pocket depth can lead to major transmission failures.

For a detailed breakdown of this issue, read the full article here: Shift Pointers: Bolt Size Matters in Transmission Repair