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Buick

APOLLO

6 cyl 250ci 1973-75 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

CENTURY and REGAL (1979 and older)

6 cyl 196ci 1978-79 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1978-79 4spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115WS

250ci 1977-79 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1977-79 4spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115WS

SOMERSET and REGAL (1980 and newer)

4 cyl 2.5L 1985-87 4spd, FWD, MR2, aluminum case BK136 BK136WS

1985-87 5spd, FWD, HM282, 9 bolt rear cover BK234 BK234WS

1st and 2nd synchro rings are multi-piece design

1985-87 5spd, FWD, MR8, Isuzu design, 7 bolt rear tin cover over 5th gears BK194 BK194WS

all synchro rings are single piece design

SKYHAWK

4 cyl 1.8L 1982-86 4spd, FWD, MR2, aluminum case BK136 BK136WS

1982-86 5spd, FWD, MR8, Isuzu design, 7 bolt rear tin cover over 5th gears BK194 BK194WS

all synchro rings are single piece design

2.0L 1983-89 4spd, FWD, MR2, aluminum case BK136 BK136WS

1983-89 5spd, FWD, MR8, Isuzu design, 7 bolt rear tin cover over 5th gears BK194 BK194WS

all synchro rings are single piece design

SKYLARK (1980 and newer)

4 cyl 2.5L 1980-85 4spd, FWD, MR2, aluminum case BK136 BK136WS

1982-85 5spd, FWD, HM282, 9 bolt rear cover BK234 BK234WS

1st and 2nd synchro rings are multi-piece design

1982-85 5spd, FWD, MR8, Isuzu design, 7 bolt rear tin cover over 5th gears BK194 BK194WS

all synchro rings are single piece design

6 cyl 2.8L 1980-85 4spd, FWD, MR2, aluminum case BK136 BK136WS

1982-85 5spd, FWD, HM282, 9 bolt rear cover BK234 BK234WS

3.8L 1978-79 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1978-79 4spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115WS

SPECIAL, SPECIAL DELUXE, GS, LESABRE, WILDCAT, ELECTRA, CENTURY, CENTURION, SKYLARK and REGAL (1979 and older)

6 cyl 225ci 1964-67 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1964-67 4spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115WS

231ci 1975-77 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1975-77 4spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115WS

250ci 1968-75 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1968-75 4spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115WS

8 cyl 260ci 1976 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1976 4spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115WS

300ci 1964-67 3spd, RWD, 318 Muncie, iron case, 4 bolt side cover BK131A N/A

1964-66 4spd, RWD, T10, iron case, 9 bolt side cover BK166 BK166WS

1966-67 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1967 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover BK116 BK116WS

1 diameter countershaft pin

1967 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover BK116HD BK116HDWS

1 diameter countershaft pin
max load front and rear mainshaft bearings

340ci 1967 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover BK116 BK116WS

1 diameter countershaft pin

1967 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover BK116HD BK116HDWS

1 diameter countershaft pin
max load front and rear mainshaft bearings

350ci 1968-73 3spd, RWD, Saginaw, iron case, 7 bolt side cover BK115 BK115AWS

1968-73 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover BK116 BK116WS

1 diameter countershaft pin

SPECIAL, SPECIAL DELUXE, GS, LESABRE, WILDCAT, ELECTRA, CENTURY, CENTURION, SKYLARK and REGAL (1979 and older)

Continued
8 cyl 350ci 1968-73 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover BK116HD BK116HDWS
– 1 diameter countershaft pin
– max load front and rear mainshaft bearings
400ci 1967-70 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover – 1 diameter countershaft pin BK116 BK116WS
1967-70 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover – 1 diameter countershaft pin – max load front and rear mainshaft bearings BK116HD BK116HDWS
401ci 1963-66 4spd, RWD, T10, iron case, 9 bolt side cover – thrust bearing between 2nd and 3rd gear BK166A BK166AWS
455ci 1971-73 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover – 1 diameter countershaft pin BK116 BK116WS
1971-73 4spd, RWD, M21/M22, Muncie, aluminum case, 7 bolt side cover – 1 diameter countershaft pin – max load front and rear mainshaft bearings BK116HD BK116HDWS
RENDEZVOUS
6 cyl 3.4L 2001-on BRTC, AWD BK455 TSK-455
3.6L 2001-on BRTC, AWD BK455 TSK-455