Symptoms:
- Burnt clutches
- Pressure loss
- Poor shift quality
Cause:
Wear of the OE clutch control valves can allow clutch apply fluid pressure to leak, resulting in burnt clutches that cause poor shift quality.Correction:
Reconditioning the bore and installing Sonnax oversized S1/S5 clutch control valve kit restores proper hydraulic function.8L45 | 8L90
Oversized S1/S5 Clutch Control Valve Kit
Part No. 154740-42K
Fits either of 2 locations.
-
Tooling:
- F-154740-TL42
- VB-FIX
You need this if... View Instructions Find a Distributor
Burnt clutches and poor shifts are common issues with GM 8L45 and 8L90 transmissions. These issues can be caused by worn clutch control bores allowing valuable clutch apply fluid pressure to leak, reducing the force needed to apply the clutches. Reconditioning the bore and installing Sonnax oversized S1/S5 clutch control valve kit 154740-42K restores proper function.
- Hardcoat anodized aluminum valve combats premature wear
- Lengthened valve spool utilizes unworn bore section to seal apply oil
- Oversized valve and replacement spring maintains OE functions and pressures
- Valve
- S1/S5 Spring
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
GM 8L45, 8L90 Valve Body Layout
You need this if...
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.
