HEAVY DUTY 2-3 SHIFT VALVE (4L60E-4L70E)
# 37799

Heavy Duty 2-3 Shift Valve

HEAVY DUTY 2-3 SHIFT VALVE (4L60E-4L70E)

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

For greatly improved input sprag and Forward clutch durability, this Sonnax heavy duty 2-3 shift valve for 4L60-E, 4L65-E and 4L70-E units will apply the overrun clutch in D3 1st, 2nd and 3rd Gears.

  • Improves input sprag and Forward clutch durability
  • Critical upgrade for all heavy-duty and performance vehicles
  • Easy to install

RangeGearOverrun with
OE 2-3 Valve		Overrun with
Sonnax Valve
OD 1st OFF OFF
2nd OFF OFF
3rd OFF OFF
4th OFF OFF
D3 1st OFF APPLIED
2nd OFF APPLIED
3rd APPLIED APPLIED
D2 1st APPLIED APPLIED
2nd APPLIED APPLIED
D1 1st APPLIED APPLIED
2nd APPLIED APPLIED

SONNAX Installation Instructions

Type of Product: Sundry Parts
Qty Needed:
Years:
Alternative #:
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