Your driveshaft is the critical link between your transmission and the rear end. The TCI 8" X-Long Yoke for 27-Spline Transmissions avoids yoke pull out and bottom out which can lead to extreme transmission and rear end damage. This high-strength, forged steel construction yoke is designed to handle the extreme conditions found with high-end circle track racing drivetrains featuring the GM Powerglide, TH350 and any other 27-spline output shaft transmission.