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

More From This Category

TCI Clutch Plates Hi-Perf Frictions Forward GM 2004R .078(4 ea.)

TCI Clutch Plates Hi-Perf Frictions Forward GM 2004R .078(4 ea.)

$109.62

TCI Frictions High Perf. Forward TH350 .098 (5 ea.)

TCI Frictions High Perf. Forward TH350 .098 (5 ea.)

$71.69

Motive Gear Differential Bearing Kit, Koyo, For CHEVROLET CORVETTE 1985–1996, Kit

Motive Gear Differential Bearing Kit, Koyo, For CHEVROLET CORVETTE 1985–1996, Kit

$242.97