1956 Corvette: Service Bulletin: Instability Above 60 MPH

Subject: Instability Above 60 MPH
Model and Year: 1956 Corvettes (Serial Numbers Listed)
Source: Chevrolet Technical Service Bulletin
Bulletin No: DR #267
Section: III
Date: October 10, 1956

TO: ALL CHEVROLET DEALERS

When an unstable condition exist above 60 MPH on 1956 Corvettes between Serial No. E56S 3175 and E56S 4156, the parts listed below should be installed:

PARTS DATA

Part	Required	Part No.
Steering Idler and 3rd Arm Assembly	1	3733215
Special Caster Shim (Round 1" Diameter) Install between idler arm bracket and crossmember to lower Idler Arm. Use bolts, part no. 181639.	2	3733479
Special Shim (Tapered) Install tapered shim with thick end to rear between frame side rails and front crossmember to increase caster. Use bolts, part no. 181639 at rear.	2	3733477
Bolt 1-1/4" long	6	181639

Wheel Alignment (Revised)

Caster both sides 1-3/4^o to 2-3/4^o
Camber both sides 0^o to 1^o
Toe-in both sides 1/8"

All of the above applies to the 1957 Corvette.

Article ID: 962
Created: October 19, 2014
Last Updated: October 19, 2014

Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1956-corvette-service-bulletin-instability-above-60-mph-962.html