Campaign - Transfer Case Adapter Mis-Machined: Overview
Number: 86C18Section: 7B
Date: December, 1986
Subject: PRODUCT CAMPAIGN 86C18
TRANSFER CASE ADAPTER MIS-MACHINED
Model and Year: 1986 K30 LIGHT DUTY MODEL TRUCKS EQUIPPED
WITH 4 SPEED MANUAL TRANSMISSION (RPO M20)
TO: ALL CHEVROLET DEALERS
General Motors has determined that transmission fluid may leak from the transfer case adapter where it meets the transfer case on some 1986 K30 models, equipped with a 4 speed manual transmission. This condition may be caused by an improperly machined transfer case adapter. The bore of the adapter at the transfer case end should be machined to a depth of 25 mm.
Units that develop a leak at this area may have an adapter bore machined to only 14 mm which does not seat properly against the transfer case. To correct this condition, adapters that have been improperly machined must be replaced.