Product Description
1000 2000 2400 Trim Valve & Spring Kit
Sonnax Part Number: 37000-12K
TOOLING REQUIRED
- 37000-TL12
2000-2009 Units Only!
WARNING: "A" and "B" trim pressure valve trains are visually similar but are not the same!
The OE trim valve and spring configuration has a very conservative pressure curve, resulting in premature clutch wear in heavy-duty Allison® 1000/2000/2400 applications. Clutch damage occurs when the TCM pressure control strategy is unable to adequately raise clutch pressure and shorten shift durations. Sonnax trim valve and spring kit 37000-12K includes A-, B- and F-trim valve springs and a A- and B- trim valves with recalibrated valve ratios, which is the only way to predictably improve clutch pressures and apply rates, resulting in 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.
- 15% More clutch pressure & clamping force than OE
- Firmer and shorter upshifts
- Firmer TCC engagement
- Improved engine braking on deceleration
PACKAGE CONTAINS
- A-Trim Valve & Spring
- B-Trim Valve & Spring
- F-Trim Spring
SYMPTOMS
- Premature clutch wear
- Inability to alter clutch apply pressure curve
CAUSE
CORRECTION
Sonnax trim valve and spring kit alters the trim valves and springs, resulting in a more responsive clutch pressure.
