Heavy Duty 2-3 Shift Valve

 

From builders to guys playing on the street, we have all experienced repeated spray vehicles. It is a problem that can ruin the best of plans.

 

When the GM 4L60-E family of transmissions evolved from the 700-R4, the overrun cluch apply no longer applied in 1st and 2nd when acclerating from a stop in D3 shifter position. This change was made to improve coastdown drivability in D3, but had the side effect of reducing reduced the torque capacity of the input section.