Source: Chevrolet Technical Service Bulletin
Number: DR - 157
Section: VI
Date: October 7, 1953
Subject: New Spoke Flywheel and Converter Attachment to Flywheel - Late 1953 Powerglide Models
TO: ALL CHEVROLET DEALERS
A new Spoke Flywheel is now being used on Powerglide Engines to reduce engine noise and vibration. The flywheel to Powerglide Converter attachment has been redesigned using three 3/8" bolts in place of six 5/16" bolts.
Changes entered the transmission and engine plants approximately 9-15-53 and will be assembled in cars 100% about 10-1-53.
SERVICE
When a new converter with three 3/8" attaching bolts is being assembled to an early type flywheel, alternate holes in the flywheel should be enlarged.
When a new flywheel is assembled to an old converter six 5/16" bolts should be used.
Service flywheels will have three 5/16" and three 3/8" holes in alternate locations.
PARTS
| Description | 1st Type | 2nd Type | Quantity |
|---|---|---|---|
| Flywheel | 3835936 | 3708436 | 1 |
| Primary Pump with Housing & Cover | 3835936 | 3708436 | 1 |
| Anchor Nut 5/16 - 24 | 3702309 | - | 6 |
| Anchor Nut 3/8 - 24 | - | 3703277 | 3 |
| Hex Bolt W/Lockwasher 5/16 - 24 | 3702682 | - | 6 |
| Hex Bolt W/Lockwasher 3/8 - 24 | - | 3708352 | 3 |
Article ID: 791
Created: August 3, 2014
Last Updated: August 3, 2014
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1953-corvette-service-bulletin-new-spoke-flywheel-and-converter-attachment-to-flywheel-late-powerglide-models-791.html