What is the purpose of a detent valve in a transmission?

A transmission shift control has a detent mechanism to provide a shift effort so that the operator has a sense of feel during shifting between ranges. During a manual shift between reverse and park, the shift effort or “detent feel” is normally higher than the effort occurring during manual shifts between other ranges.

Where is the transmission fluid valve?

The reason for this is that the transmission fluid check valve on a sealed transmission is on the bottom of the car, but the vehicle must also be level to ensure an accurate reading.

Why do transmissions look like mazes?

Considered the brain of the transmission, the valvebody is made up of two sides, which look like a maze of hydraulic passages with a separator plate in between. Shift kits reduce slippage between gear changes and often prolong transmission life.

Are there valves in a transmission?

All automatic transmissions have a valve body that acts as the brain of the transmission. Within, there are dozens of passages and channels that direct the flow of hydraulic fluid to different parts of the transmission. The valve body has a 1-2 shift valve that is responsible for shifting up from first to second gear.

Where are the detent plates in a transmission?

A detent plate may also be included within the transmission assembly when the shift tower 24 is used. This provides two detent members within the transmission shift control system. A secondary detent in the column-mounted shift controls, shown in FIG. 1, may also be included in the steering column.

How does the detent spring work on a transmission?

The detent spring 20 is secured to a stationary post or component 61 formed in the transmission housing or valve body 18 by a threaded fastener 62. The detent spring 20 has the detent roller 22 rotatably mounted thereon through a pin 64 secured to the detent spring 20.

How does the detent mechanism in a transmission work?

The detent mechanism providing the “detent feel” is comprised of a spring-biased roller in a notched detent plate comprised of rises and valleys. The spring urges the roller against the notched surface on the plate. The ramps or rises provide increased shift effort during movement of the plate from range to another.

How is the Transmission Control Cable 44 connected?

The transmission control cable 44 is connected with a lever not shown, which in turn is connected with a shaft similar to the manual shaft 12, shown in FIG. 1. A detent plate may also be included within the transmission assembly when the shift tower 24 is used. This provides two detent members within the transmission shift control system.