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1963 Corvette: Service Bulletin: Improved Vacuum Modulator

Subject:   Improved Vacuum Modulator
Model and Year:   1963 Aluminum Powerglide
Source:  Chevrolet Technical Service Bulletin
Bulletin No:  DR #568
Section:   VII
Date:  December 17, 1962

TO:  ALL CHEVROLET DEALERS

An improved vacuum modulator system has been incorporated in the 1963 Aluminum Powerglide transmission effective at start of production at Cleveland and beginning with transmission code #T911 at Toldeo.  Modulator parts are not interchangeable between old and new design.  If service is required, replace parts must be same type as original equipment.

The old and new vacuum modulator systems are illustrated  on the reverse side.  Parts data is also included to enable the correct parts to be obtained in the event replacement is required.

ALL 1962 AND EARLY 1963
TOLEDO TRANSMISSIONS
ALL 1963 CLEVELAND AND
1963 TOLEDO DATE STAMPED
T911 AND LATER
DESCRIPTION
3789122 3830276 Vacuum Modulator Valve
--- 3830311 Vacuum Modulator Valve Plunger
3812741 3830229 Vacuum Modulator Assem.

1962 and Early 1963 Toldeo Transmissions

All 1963 Cleveland and 1963 Toldeo Date Staped T911 and Later

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