GMC Transfer Case

ENVOY and ENVOY XL

6 cyl 4.2L 2002-on NP126/NP226, aluminum cases, chain driven BK243 TSK-226

8 cyl 5.3L 2002-on NP126/NP226, aluminum cases, chain driven BK243 TSK-226

JIMMY – S SERIES COMPACT (similar to S10 Blazer)

4 cyl 1.9L 1983-86 NP207, aluminum cases, chain driven BK207 TSK-207

2.0L 1983-84 NP207, aluminum cases, chain driven BK207 TSK-207

2.5L 1984-88 NP207, aluminum cases, chain driven BK207 TSK-207

1988-89 NP231, aluminum cases, chain driven BK231 TSK-231

6 cyl 2.8L 1983-88 NP207, aluminum cases, chain driven BK207 TSK-207

1988-89 NP231, aluminum cases, chain driven BK231 TSK-231

4.3L 1990-94 NP231, aluminum cases, chain driven BK231 TSK-231

24mm wide input bearing (BD50-8)

1995-97 NP231, aluminum cases, chain driven BK231A TSK-231

16mm wide input bearing (6010-N)

1992-94 NP233, aluminum cases, chain driven, electric shift BK230A TSK-233

24mm wide input bearing (BD50-8)

1995-on NP233, aluminum cases, chain driven, electric shift BK230 TSK-233

16mm wide input bearing (6010-N)

1995-97 BW4472, aluminum cases, cast “4472”, chain driven BK1372 TSK-1372

viscous coupler

1998-on NP233, aluminum cases, chain driven, electric shift BK233 TSK-136

clutch pack for all wheel drive mode

JIMMY, SUBURBAN and YUKON FULL SIZE – (including YUKON DENALI)

6 cyl 194ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-76 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-76 NP203, iron cases, chain driven BK203G TSK-203G

230ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-76 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-76 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-76 NP203, iron cases, chain driven BK203G TSK-203G

250ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-79 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-79 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-79 NP203, iron cases, chain driven BK203G TSK-203G

292ci 1969 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-79 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-79 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

JIMMY, SUBURBAN and YUKON FULL SIZE – (including YUKON DENALI) Continued

6 cyl 292ci 1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-79 NP203, iron cases, chain driven BK203G TSK-203G

8 cyl 283ci 1963-68 Rockwell 221, iron case, gear driven BK221 TSK-221

305ci 1976-79 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1976-79 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1976-79 NP203, iron cases, chain driven BK203G TSK-203G

307ci 1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

1969-73 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-73 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1973 NP203, iron cases, chain driven BK203G TSK-203G

327ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

350ci 1967-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-76 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-79 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-79 NP203, iron cases, chain driven BK203G TSK-203G

396ci 1969-73 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

402ci 1970-73 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

454ci 1973-79 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

5.0L 1980 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1980 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1981-88 NP208, aluminum cases, chain driven BK208 TSK-208

1989-94 NP241, aluminum cases, chain driven BK241 TSK-208

24mm wide input bearing (BD50-8)

1995-99 NP241, aluminum cases, chain driven BK241A TSK-208

16mm wide input bearing (6010-N)

1996-99 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243

16mm wide input bearing (6010-N)

1998-99 NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

5.3L 1999-on NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

2003-on BW4482, aluminum cases, chain driven, “NR4” option BK4482 TSK-4482

5.7L 1980 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1980 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

90mm O.D. input bearing

1981-88 NP208, aluminum cases, chain driven BK208 TSK-208

1989-94 NP241, aluminum cases, chain driven BK241 TSK-208

24mm wide input bearing (BD50-8)

1995-99 NP241, aluminum cases, chain driven BK241A TSK-208

16mm wide input bearing (6010-N)

1996-99 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243

JIMMY, SUBURBAN and YUKON FULL SIZE – (including YUKON DENALI) Continued

8 cyl 5.7L 1998-99 NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

clutch pack for all wheel drive mode

6.0L 1999-on NP246, aluminum cases, chain driven, electric shift, “NP8” option BK351 TSK-246

2000-on NP136, aluminum cases, chain driven, “NP3” option, DENALI ONLY BK333 TSK-136

All Wheel Drive, single speed

2003-on BW4481, aluminum cases, chain driven, “NR3” option, DENALI ONLY BK4481 TSK-4481

All Wheel Drive, single speed

2003-on BW4482, aluminum cases, chain driven, “NR4” option BK4482 TSK-4482

All Wheel Drive, two speed

6.2L 1982-87 NP208, aluminum cases, chain driven BK208 TSK-208

7.4L 1980 NP205, iron case, gear driven BK205GDM4 TSK-205GDM

1989-94 NP241, aluminum cases, chain driven BK241 TSK-208

24mm wide input bearing (BD50-8)

1995-99 NP241, aluminum cases, chain driven BK241A TSK-208

16mm wide input bearing (6010-N)

1996-99 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243

1998-00 NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

8.1L 2001-on NP246, aluminum cases, chain driven, electric shift, “NP8” option BK351 TSK-246

2000-on NP136, aluminum cases, chain driven, “NP3” option, DENALI ONLY BK333 TSK-136

All Wheel Drive, single speed

2003-on BW4481, aluminum cases, chain driven, “NR3” option, DENALI ONLY BK4481 TSK-4481

All Wheel Drive, single speed

2003-on BW4481, aluminum cases, chain driven, “NR4” option, DENALI ONLY BK4484 TSK-4484

All Wheel Drive, two speed

PICKUP and VAN FULL SIZE (1987 and Earlier)

6 cyl 194ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-76 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-79 NP203, iron cases, chain driven BK203G TSK-203G

230ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-76 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-76 NP203, iron cases, chain driven BK203G TSK-203G

250ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-78 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-78 NP203, iron cases, chain driven BK203G TSK-203G

292ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221

1969-79 NP205, iron case, gear driven BK205GDM TSK-205GDM

80mm O.D. input bearing

1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20

33.25mm I.D. front output bearing cones

1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20

30mm I.D. front output bearing cones

1973-79 NP203, iron cases, chain driven BK203G TSK-203G

PICKUP and VAN FULL SIZE (1987 and Earlier)
Continued
6 cyl 305ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221
1970 NP205, iron case, gear driven BK205GDM TSK-205GDM
351ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221
1970 NP205, iron case, gear driven BK205GDM TSK-205GDM
– 80mm O.D. input bearing
4.3L 1985-87 NP208, aluminum cases, chain driven BK208 TSK-208
4.7L 1980 NP205, iron case, gear driven BK205GDM TSK-205GDM
– 80mm O.D. input bearing
1980 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
– 90mm O.D. input bearing
1981-84 NP208, aluminum cases, chain driven BK208 TSK-208
4.8L 1985-87 NP208, aluminum cases, chain driven BK208 TSK-208
2003-on BW4473, aluminum cases, cast “4473”, VAN ONLY BK4473 TSK-4473
8 cyl 283ci 1963-67 Rockwell 221, iron case, gear driven BK221 TSK-221
305ci 1976-79 NP205, iron case, gear driven BK205GDM TSK-205GDM
– 80mm O.D. input bearing
1976-79 NP203, iron cases, chain driven BK203G TSK-203G
307ci 1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20
– 33.25mm I.D. front output bearing cones
1969-73 NP205, iron case, gear driven BK205GDM TSK-205GDM
– 80mm O.D. input bearing
1973 NP203, iron cases, chain driven BK203G TSK-203G
327ci 1963-69 Rockwell 221, iron case, gear driven BK221 TSK-221
350ci 1967-69 Rockwell 221, iron case, gear driven BK221 TSK-221
1969-76 NP205, iron case, gear driven BK205GDM TSK-205GDM
– 80mm O.D. input bearing
1969-79 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
– 90mm O.D. input bearing
1969-73 Dana Model 20, iron case, gear driven BK20 TSK-20
– 33.25mm I.D. front output bearing cones
1973-75 Dana Model 20, iron case, gear driven BK20A TSK-20
– 30mm I.D. front output bearing cones
1973-79 NP203, iron cases, chain driven BK203G TSK-203G
396ci 1969-73 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
402ci 1970-73 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
454ci 1973-79 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
5.0L 1980 NP205, iron case, gear driven BK205GDM TSK-205GDM
– 80mm O.D. input bearing
1980 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
– 90mm O.D. input bearing
1981-88 NP208, aluminum cases, chain driven BK208 TSK-208
5.7L 1980-87 NP205, iron case, gear driven BK205GDM TSK-205GDM
– 80mm O.D. input bearing
– non-synchronized
1980-87 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
– 90mm O.D. input bearing
1981-87 NP208, aluminum cases, chain driven BK208 TSK-208
1983-87 NP205, iron case, gear driven BK205G TSK-205GDM
– synchronized
6.2L 1982-87 NP208, aluminum cases, chain driven BK208 TSK-208
7.4L 1980-87 NP205, iron case, gear driven BK205GDM4 TSK-205GDM
– 90mm O.D. input bearing
S15 – S SERIES COMPACT TRUCK
4 cyl 1.9L 1983-86 NP207, aluminum cases, chain driven BK207 TSK-207
2.0L 1983-84 NP207, aluminum cases, chain driven BK207 TSK-207
2.5L 1985-88 NP207, aluminum cases, chain driven BK207 TSK-207
1988-93 NP231, aluminum cases, chain driven BK231 TSK-231
©D.Helm & M. Leininger 2006
S15 – S SERIES COMPACT TRUCK Continued

6 cyl 2.8L 1983-88 NP207, aluminum cases, chain driven BK207 TSK-207

1988-89 NP231, aluminum cases, chain driven BK231 TSK-231

4.3L 1990-94 NP231, aluminum cases, chain driven BK231 TSK-231

– 24mm wide input bearing (BD50-8)

1992-94 NP233, aluminum cases, chain driven, electric shift BK230A TSK-233

– 24mm wide input bearing (BD50-8)

1995-97 NP231, aluminum cases, chain driven BK231A TSK-231

– 16mm wide input bearing (6010-N)

1995-on NP233, aluminum cases, chain driven, electric shift BK230 TSK-233

– 16mm wide input bearing (6010-N)

1998-on NP233, aluminum cases, chain driven, electric shift BK233 TSK-136

– clutch pack for all wheel drive mode

SAFARI VAN

6 cyl 4.3L 1990-98 BW4472, aluminum cases, cast “4472”, chain driven BK1372 TSK-1372

1999-on NP136, aluminum cases, chain driven BK333 TSK-136

1500, 2500, 3500, SIERRA 1500, SIERRA 2500, SIERRA 3500 and FULL SIZE VAN (1988 and Newer)

6 cyl 4.3L 1988-94 NP241, aluminum cases, chain driven BK241 TSK-208

– 24mm wide input bearing (BD50-8)

1995-99 NP241, aluminum cases, chain driven BK241A TSK-208

– 16mm wide input bearing (6010-N)

1996-98 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243

1998-on NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

8 cyl 4.8L 1999-on NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

2003-on BW4473, aluminum cases, cast “4473”, VAN ONLY BK4473 TSK-4473

5.0L 1988-94 NP241, aluminum cases, chain driven BK241 TSK-208

– 24mm wide input bearing (BD50-8)

1995-99 NP241, aluminum cases, chain driven BK241A TSK-208

– 16mm wide input bearing (6010-N)

1996-98 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243

1998-99 NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

5.3L 1999-on NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

– clutch pack for all wheel drive mode

2003-on BW4473, aluminum cases, cast “4473”, VAN ONLY BK4473 TSK-4473

5.7L 1988-94 NP241, aluminum cases, chain driven BK241 TSK-208

– 24mm wide input bearing (BD50-8)

1988-91 NP205, iron case, gear driven, K3500 ONLY BK205GDM4 TSK-205GDM

– 90mm O.D. input bearing

1989-00 BW1370, aluminum cases, cast “1370” or “4401”, K3500 ONLY BK1356 TSK-1356

– does not have a center plate between cases

1990-00 BW4470, aluminum cases, cast “4470” or “4401”, K3500 ONLY BK4470 TSK-4470

– center plate between cases

1995-99 NP241, aluminum cases, chain driven BK241A TSK-208

– 16mm wide input bearing (6010-N)

1996-98 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243

1998-99 NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

6.0L 1999-on NP246, aluminum cases, chain driven, electric shift BK351 TSK-246

2001-on NP261/NP263, aluminum cases, chain driven BK371 TSK-261

2001-on NP261XHD/NP263XHD, aluminum cases, chain driven BK371A TSK-261XHD

2003-on BW4473, aluminum cases, cast “4473”, VAN ONLY BK4473 TSK-4473

1500, 2500, 3500, SIERRA 1500, SIERRA 2500, SIERRA 3500 and
FULL SIZE VAN (1988 and Newer)
Continued
8 cyl 6.2L 1988-91 NP241, aluminum cases, chain driven BK241 TSK-208
– 24mm wide input bearing (BD50-8)
1988-91 NP205, iron case, gear driven, K3500 ONLY BK205GDM4 TSK-205GDM
– 90mm O.D. input bearing
6.5L 1992-00 BW1370, aluminum cases, cast “1370” or “4401”, K3500 ONLY BK1356 TSK-1356
– does not have a center plate between cases
1992-00 BW4470, aluminum cases, cast “4470” or “4401”, K3500 ONLY BK4470 TSK-4470
– center plate between cases
1992-94 NP241, aluminum cases, chain driven BK241 TSK-208
– 24mm wide input bearing (BD50-8)
1995-99 NP241, aluminum cases, chain driven BK241A TSK-208
– 16mm wide input bearing (6010-N)
1996-98 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243
1998-00 NP246, aluminum cases, chain driven, electric shift BK351 TSK-246
6.6L 2001-on NP261XHD/NP263XHD, aluminum cases, chain driven BK371A TSK-261XHD
7.5L 1988-91 NP241, aluminum cases, chain driven BK241 TSK-208
– 24mm wide input bearing (BD50-8)
1988-91 NP205, iron case, gear driven, K3500 ONLY BK205GDM4 TSK-205GDM
– 90mm O.D. input bearing
1992-00 BW1370, aluminum cases, cast “1370” or “4401”, K3500 ONLY BK1356 TSK-1356
– does not have a center plate between cases
1992-00 BW4470, aluminum cases, cast “4470” or “4401”, K3500 ONLY BK4470 TSK-4470
– center plate between cases
1995-99 NP241, aluminum cases, chain driven BK241A TSK-208
– 16mm wide input bearing (6010-N)
1996-98 NP243, aluminum cases, chain driven, electric shift BK332 TSK-243
1998-00 NP246, aluminum cases, chain driven, electric shift BK351 TSK-246
8.1L 2001-on NP261/NP263, aluminum cases, chain driven BK371 TSK-261
2001-on NP261XHD/NP263XHD, aluminum cases, chain driven BK371A TSK-261XHD
2003-on BW4473, aluminum cases, cast “4473”, VAN ONLY BK4473 TSK-4473