The forward sprag assembly is usually taken for granted by most transmission builders. If it appears there is no or
maybe just a little wear it is generally reinstalled. In this guide we will take a look at the importance of this little
part in high performance applications of the 700R4 and 4L60E transmissions.
The sprag is a one way clutch, which by definition, is a mechanical device that lets a unit rotate in one
direction, but prevents it from rotating in the opposite direction. This unique type of clutch is desirable
because it releases as soon as torque applied to it is interrupted, thus eliminating the timing overlap problems associated with
releasing one member, and applying another.