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

MANLEY Valve Lock, 10 Degree Machined, Conventional, Titanium, +.050 .3110 in. Stem, Set of 16

MANLEY Valve Lock, 10 Degree Machined, Conventional, Titanium, +.050 .3110 in. Stem, Set of 16

$413.60

COMP Cams Conical Valve Spring Kit GM LS w/ Tool Steel Retainers

COMP Cams Conical Valve Spring Kit GM LS w/ Tool Steel Retainers

$1,321.85

COMP Cams Valve Seal, Metal Viton, .530 in. Guide Size, 5/16 Valve Stem, Set of 16

COMP Cams Valve Seal, Metal Viton, .530 in. Guide Size, 5/16 Valve Stem, Set of 16

$41.88

Trick Flow Valve Springs, PAC Racing, Triple, 1.645 in. Outside Diameter, 688 lbs./in. Rate, 1.130 in. Coil Bind, Set 16

Trick Flow Valve Springs, PAC Racing, Triple, 1.645 in. Outside Diameter, 688 lbs./in. Rate, 1.130 in. Coil Bind, Set 16

$948.30

MANLEY Valve Spring Locator, Inside, Heat-Treated, Fits 1.58 in. OD. Spring, .567 in. ID, 1.57 in. OD, .045 in. Thick, Black, Each

MANLEY Valve Spring Locator, Inside, Heat-Treated, Fits 1.58 in. OD. Spring, .567 in. ID, 1.57 in. OD, .045 in. Thick, Black, Each

$13.39

MANLEY Valve Spring, Professional, Chrome Silicon, 1.550 in. OD, 458 lbs./in. Rate, 1.180 in. Coil Bind Height, Dual, Set of 16

MANLEY Valve Spring, Professional, Chrome Silicon, 1.550 in. OD, 458 lbs./in. Rate, 1.180 in. Coil Bind Height, Dual, Set of 16

$584.93