Valve Body Archives - Transmission Digest
TransGo introduces new valve body repair kit for GM 8L series

TransGo has introduced a new valve body repair kit for GM 8L45 and 8L90 transmissions, model years 2015 and on. According to the company, the kit includes: a drop-in PR and shuttle valve line-up; a drop-in TCC regulator valve; drop-in S2, S3 and S4 regulator valves; an oversize converter feed limit valve; and an oversize

Video: Valve Body Inspection

Valve body inspection today requires much greater attention than yesterday.

Mercedes 722.9 VB/TCU

The TRP (theft relevant parts) process must be followed when dealing with Mercedes.

Chrysler RFE Transmission Family Part 2: Solenoid and Valve Body Components

To enhance fuel economy Chrysler released the A500/A518 overdrives in the late ’80s and ’90s.

6R140 Transmission Solenoid Strategy Code

When replacing solenoids, plan ahead and order the correct band numbers that came out of the transmission in the same location as they came out of.

GM 4L65E: The Purpose of Omitting the #5 Ball

Wayne Colonna describes a 4L65E with a modified valve body spacer plate where the #5 checkball was left out.

Suburu 4AT Phase ll Version ll Control and Valve Body Changes

Sometime at the beginning of the 2004 model year, Subaru redesigned the 4AT Phase ll Control system that placed the transfer clutch control solenoid into the valve body. The new design valve body (referred to as Version II) contained 3 clutch control solenoids, 2 brake control solenoids, a TCC and pressure control solenoid (Figure 1).

ZF8HP55 transmission

Sonnax has a set of vacuum diagrams for the ZF8HP55 transmission.

Valve body – GM Gen. 2 6T70, 6T75, 6T80 – Vacuum testing

Critical Wear Areas & Vacuum Test Locations
NOTE: OE valves are shown in rest position and should be tested in rest position unless otherwise
indicated. Test locations are pointed to with an arrow. Springs are not shown for visual clarity.
A low vacuum reading indicates wear. For specific vacuum test parameters,
refer to additional information available at

Trading Places

Most builders swapping hard parts have learned that mismatching drive components in a transverse unit will result in a host of negative consequences. The wrong ratio sprocket(s) or carrier can result in TCC and ratio codes, along with converter and unit clutch slippage. Unfortunately, optional ratios aren’t exclusive to the final drive; they can exist in the valve body as well.

Sonnax submits a vacuum-test layout for the 6R140 valve body.

Sonnax submits a vacuum-test layout for the 6R140 valve body.

Sonnax Vacuum-Test Layout – 45RFE

Sonnax Vacuum-Test Layout – 45RFE