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Reverse Boost Valve Kit, with O-Rings, Large Ratio 700R4

Reverse Boost Valve Kit, with O-Rings, Large Ratio 700R4

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$23.95

Quick Overview

SONNAX 700R4 REVERSE BOOST VALVE KIT, WITH O-RINGS, LARGE RATIO

Details

Vehicles with a 4L60 transmission often have problems with poor reverse boost or upshifts in
manual low. These are generally caused by a worn reverse boost valve sleeve or wear at the pump
body. Sonnax now offers the larger (.283") reverse boost valve assembly K77898, which restores
the hydraulic integrity of the assembly. Due to the differences in the thermal expansion rate of
steel and aluminum when the transmission approaches operating temperature, the sleeve has been
allowed excessive clearance and scrubs the bore.

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