Lube Regulator and Converter Relief Spring Kit
Part No. 37000-01K

2003 & Earlier, 6 solenoid units

• Made from improved materials for increased durability over OE
• Drop-in replacement
• Converter spring is recalibrated to improve converter charge and internal pressure

Contents

E-Shift Valve Spring
Part No. 37000-02

Tooling: 

• 37000-02BST

Listed Allison 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

F-Trim Valve End Sleeve

Partnr. 37000-03 Fits '00-'05 units only

The F-trim valve in Allison 1000/2000/24000 ('00-'05) units is controlled by a PWM solenoid that continuously strokes the valve. When the valve end sleeve becomes worn from constant oscillation, it allows TCC PWM pressure to leak to exhaust, inhibiting the valve from stroking against the spring and causing converter apply concerns, TCC surge, TCC slippage, code P0741 and overheating.

The valve end sleeve also can become worn enough to cause the valve to stick, causing converter release problems as well as apply problems, depending on which direction the valve gets stuck. Sonnax F-trim valve end sleeve 37000-03 is wear-resistant and has high lubricity characteristics to restore the F-trim valve to normal operation.

• Sleeve is made from high-quality aluminium for increased wear resistance

• High lubricity ensures proper valve operation

Symptoms:

• Overheating

• Code P0741

• TCC surge

Cause:

Wear of the F-Trim valve end sleeve allows TCC PWM control oil to leak to exhaust and van also vause the valve to stick.

Correction:

Wear-resistant Sonnax sleeve is designed to restore converter apply and release pressure.

C-1 Valve & Seal Kit
Part No. 37000-05K

Feb 2004 & earlier pumps

• Valve changes the fixed flow rate to a regulated flow rate, reducing wear of the C1 clutch hub.
• PTFE seal prevents C1 oil from leaking to exhaust.
• This is a drop in replacement, with no bore modifications required.

Contents

Bore Sizing Tool

Part No. 37000-02BST

Bore Sizing Tool for 37000-02