Allison 1000/2000/2400 units commonly exhibit 3rd Gear starts and trouble codes related to a sticking E-shift valve. The low return rate of the OE spring combined with flashing or wear ridges forming in bore over time allow the valve to hang up, resulting in these concerns. Crack down on sticking valve action by reconditioning the bore and installing stronger Sonnax E-shift valve spring 37000-02.

Bore sizing tool 37000-02BST improves bore finish and removes flashing and ridges for smoother valve operation
Stronger spring helps prevent valve binding

More From This Category

Crow Cams Single Groove Machined Valve Locks

Crow Cams Single Groove Machined Valve Locks

$73.35

Sonnax Boost Valve Kit, GM Th400, Th425, Each

Sonnax Boost Valve Kit, GM Th400, Th425, Each

$61.45

COMP Cams Conical Valve Spring, .630 in. Lift Kit for '09-'18 For Dodge 5.7/6.2/6.4 HEMI

COMP Cams Conical Valve Spring, .630 in. Lift Kit for '09-'18 For Dodge 5.7/6.2/6.4 HEMI

$1,064.09

MANLEY Valve Spring Locator, Inside, Heat-Treated, Fits 1.560 in. OD. Spring, .567 in. ID, 1.550 in. OD, .062 in. Thick, Black, Each

MANLEY Valve Spring Locator, Inside, Heat-Treated, Fits 1.560 in. OD. Spring, .567 in. ID, 1.550 in. OD, .062 in. Thick, Black, Each

$11.77