46RE TV Spring Adjustment

We reuse the OEM TV spring on every remanufactured Valve Body, however if late upshifts are a concern, adjust/set the TV gap first (TV arm to TV valve), then install the purple spring with two shims (provided with Valve Body). If late upshifts persist, install purple spring with one shim. Verify that the problem is not related to governor pressure.

NOTE: It is not necessary to completely remove the valve body to alter this spring adjustment. Remove the external linkage levers and loosen/lower the valve body about 3⁄4” with bolts still in place. Remove the two bolts, one side and one lower bracket bolt (that are holding the spring bracket into position). Pivot the bracket off toward the front, slide out the throttle plunger, spring and valve.

Increasing TV pressure Above OEM Specifications

Spring shims can be used to increase throttle sensitivity, delay upshifts and reduce throttle buzz or pulsation. The shims can be installed on either the plunger or control valve, where the spring sits. Spring shims increase spring load and TV pressure. TV pressure delays upshifts and gives sensitivity to 3-2 downshifts. Note: Vehicle load, driving habits and engine modifications will affect the outcome. Increasing line pressure and leaking governor circuits result in sensitive 1-2, 2-3 and 3-2 shift timing.

The spring shims can be installed to increase throttle pressure at an idle, which stabilizes the TV valve and often eliminates a pulsation or buzz. Adding one shims will delay the upshifts slightly approximately 3-5 mph depending on load, engine, etc. Installing a second shim is suggested when late upshifts are desired. For example, on the OEM blue spring, each shim raises the spring weight approximately .5 lbs. And increases TV pressure by 7 psi. The shims can also be used in conjunction with the modified Sonnax spring (included with your Valve Body purchase).

Decreasing TV pressure Below OEM Specifications

A common problem in the 42-46-47RH/RE, A904 and A727 is poor throttle control that occurs during heavy load or towing applications. The increased load requires the driver to use more throttle. This increases TV pressure and creates complaints such as late 2-3 upshift and oversensitive 3-2 downshifts. Installing the modified spring and shim(s) designed by Sonnax (provided with Valve Body) can reduce TV pressure and sensitivity. The Sonnax spring and shims can be combined with additional spring shims to fine-tune TV pressure.

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