Tool Required

Printpartsummary
Symptoms:
  • Inability to alter clutch apply pressure curve
  • Premature clutch wear
Cause:

OE valve and spring configuration do not allow TCM pressure control strategy to adequately raise clutch pressure and shorten shift durations.

Correction:

This Sonnax kit alters the trim valves and springs, resulting in a more responsive clutch pressure.

Tool Required

1000/2000/2400

Trim Valve & Spring Kit

Part No.

37000-12K

Trim Valve & Spring Kit
  • 37000-12k_combo

  • Trim Valve & Spring Kit

  • Figure_3

  • Figure_2

  • 37000-12k_details

Small_37000-12k_combo Small_37000-12k_compare Small_figure_3 Small_figure_2 Small_37000-12k_details

1000/2000/2400

Trim Valve & Spring Kit

Part No. 37000-12K

  • A-Trim Valve & Spring
  • B-Trim Valve & Spring
  • F-Trim Spring

Fits '00-'09 units only.

The F-trim spring is applicable to '00-'05 valve body casting only.

Complaint:

  • Inability to alter clutch apply pressure curve
  • Premature clutch wear

Cause:

OE valve and spring configuration do not allow TCM pressure control strategy to adequately raise clutch pressure and shorten shift durations.


Correction:

This Sonnax kit alters the trim valves and springs, resulting in a more responsive clutch pressure.

Premature clutch wear in Allison® 1000/2000/2400 ('02-'09) heavy duty applications can occur when the OE valve and spring configuration do not allow TCM pressure control strategy to adequately raise clutch pressure and shorten shift durations. Sonnax trim valve and spring kit 37000-12K alters the A-, B- and F-trim valves and springs, resulting in a more responsive clutch pressure (see Figures 2 and 3).The F-trim bore in '00-'05 units contains an F-trim sleeve (Figure 1). This bore can be upgraded using the spring in this kit and Sonnax F-trim valve sleeve 37000-03.

  • Firmer and shorter upshifts
  • Firmer TCC engagement
  • Improved engine braking on deceleration
  • Increased clutch torque capacity

Required Tools

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Contact a Sonnax Distributor to purchase this part.