LeSabre V6-181 3.0L (1986)
Figure 2
Many changes were implemented to help reduce center gearbox distress. This bulletin will discuss them and refer to service bulletins already published
on previous changes and what components should be inspected during an overhaul. Also, some other helpful tips and information about lubrication flow
have been added. Reference Figures 1 and 2.
Several aftermarket publications have been written concerning different ways to modify the center gear box. Some of the modifications include grinding
slots, lining up the lube holes differently, and greatly increasing the fluid level. DO NOT ATTEMPT THESE PROCEDURES! These publications were
written to supposedly improve the performance of the center gear box, but instead the modifications can cause durability concerns.
1.
Changes have been made to the 3rd roller clutch which will improve its durability. Revisions have been made to the lube holes on the outside
race. Four of the lube holes have been eliminated. When the lube holes are eliminated, the rollers are less likely to cock or skew when
overrunning. When the rollers cock or skew, excessive heat is created. Refer to Service Bulletin 90-7440-10.
