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6R60 6R75 6R80 6R140 ZF Ford Clutch A Control Boost Valve Kit Sonnax 9574021K
6R60 6R75 6R80 6R140 ZF Ford Clutch A Control Boost Valve Kit Sonnax 9574021K
S49741ATK
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6R60 · 6R75 · 6R80 · 6R140
ZF6HP19 · ZF6HP26 · ZF6HP32
Clutch A Control Boost Valve Kit
Part No. 95740-21K
The ZF6HP19/26/32 (Gen. 1) and Ford 6R60, 6R75, 6R80, 6R100 transmissions are equipped with a plastic sleeve for the clutch A control boost valve. This sleeve is prone to damage—especially during removal—and its failure can result in:
- Delayed or harsh forward engagement
- Flare 5-4 downshifts
- No 4-5 upshift
The Sonnax 95740-21K clutch A control boost valve and sleeve kit restores proper 4-5 downshift function, corrects missing 4-5 upshifts, and resolves forward engagement issues. It also serves as a direct replacement for damaged OE boost assemblies and must be used with the OE clutch A control valve.
Features & Benefits:
- Hardcoat anodized aluminum valve resists premature wear
- Aluminum boost sleeve offers high wear resistance for extended life
- Direct replacement fits OE bore and works with OE clutch control valve
- No special tools required
- Drop-in Zip Valve™ parts install quickly and easily

