The 2.3L TCC regulator valve has a lower spring rate and lower apply pressure than the 4.0L. If the incorrect core is installed or the springs have been damaged, the TCC apply pressure is reduced and slippage occurs. The springs in the Sonnax kit 37947-46K have been designed to match the 4.0L calibration. The kit can be used to replace weak, broken or lost springs in 4.0L applications or to convert a 2.3L valve body core for use in a 4.0L application.

Direct replacement 4.0L springs salvage or upgrade the valve body.
Spring kit allows conversion of 2.3L valve body to 4.0L application.

More From This Category

TCI Automatic Transmission Shift Lever, Steel, Gold Anodized, GM, TH350/TH400, Each

TCI Automatic Transmission Shift Lever, Steel, Gold Anodized, GM, TH350/TH400, Each

$91.42

Sonnax Primary Pulley Bearing, JF017/19E (Re0F10E/J), Each

Sonnax Primary Pulley Bearing, JF017/19E (Re0F10E/J), Each

$182.58

MANLEY Connecting Rod Pin Bushing, Bronze, .910 in. OD, .856 in. ID, .950 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, .910 in. OD, .856 in. ID, .950 in. Length, Each

$22.80

Motive Gear Differential Pinion Bearing Kit, Koyo, For BUICK APOLLO 1973–1975, Kit

Motive Gear Differential Pinion Bearing Kit, Koyo, For BUICK APOLLO 1973–1975, Kit

$85.88

MANLEY Connecting Rod Pin Bushing, Bronze, .910 in. OD, .860 in. ID, 1.010 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, .910 in. OD, .860 in. ID, 1.010 in. Length, Each

$22.80