Seville V8-273 4.5L (1989)
Changes were made to the input sprag clutch during the 1986 model year to improve its durability. Revisions included increasing the width of the sprag
assembly to reduce the possibility of rollover. Refer to Cadillac Service Bulletin T-88-101 in Group 7.
2. THIRD ROLLER CLUTCH
Changes were made to the third roller clutch twice during the 1989 model year to improve its durability. Revisions included reducing the width of the
third roller cam, modifying the third roller lube dam, and eliminating four lube holes on the outside race. With the narrower cam and the number of lube
holes reduced, the rollers are less likely to cock or skew when over-running. When the rollers cock or skew, excessive heat is created. Refer to Cadillac
Service Bulletins T-90-42 and T-90-65 in Group 7.
3. OUTPUT SHAFT
Changes were made to the output shaft during the 1985 and 1989 model years to improve lubrication to the center gearbox area. Revisions included
changing the output shaft bearing from a double row to a single row of needle bearings. Refer to Cadillac Service Bulletins T-88-101 and T-90-65 in
Group 7.
4. THIRD CLUTCH ASSEMBLY
The third clutch assembly was changed from an 8-plate to a 10-plate design beginning with the 1989 model year. This revision increased the third clutch
torque capacity and reduced heat build up during repeat manual lo engagements.
