Model Year: 1955
Subject: Rear Engine Mountings 1955 Passenger 6 & 8 Cylinder with Powerglide
Source: Chevrolet Service Bulletin
Number: DR #230
Section: VI
Date: November 2, 1955
TO: ALL CHEVROLET DEALERS
In cases where the rear engine mounting bolts break or shear off on any 1955 Passenger Car with Powerglide Transmission, the 3/8" bolts and studs should be replaced with the special steel bolts and stud as listed below.
SERVICE
It will be necessary to remove the Powerglide Servo Cover and the Low and Drive Drive Valve Body to drill and tap the mounting hols in the Flywheel Housing for 7/16" - 14 stud and bolts, use drill Letter "U" which is .368" Diameter or a 23/64" Drill. It may also be necessary to drill the corresponding holes in the mounting to 7/16".
Flat Rate time two hours.
PARTS DATA
| Required | Description | Part No. |
|---|---|---|
| 1 | Rear Mounting - Left Hand | 3721665 |
| 1 | Rear Mounting - Right Hand | 3721666 |
| 3 | Bolts (Special Steel) | 3722375 |
| 4 | Washers | 120383 |
| 1 | Nut | 120370 |
| 1 | Stud (Special Steel) | 103215 |
Article ID: 772
Created: August 3, 2014
Last Updated: December 27, 2014
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1955-corvette-service-bulletin-rear-engine-mountings-1955-passenger-6-8-cylinder-with-powerglide-772.html