Product Description
WARNING: "A" and "B" trim pressure valve trains are visually similar but are not the same!
Tooling Required
1000 2000 2400 Trim Valve & Spring Kit
2000-2009 Units Only!
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
Symptoms
- Premature clutch wear
- Inability to alter clutch apply pressure curve
Cause
OE valve and spring configuration do not allow TCM pressure control strategy to adequately raise clutch pressure and shorten shift durations.
Correction
Sonnax trim valve and spring kit alters the trim valves and springs, resulting in a more responsive clutch pressure.
Contents
- A-Trim Valve & Spring
- B-Trim Valve & Spring
- F-Trim Spring
