Make:

GMC

Model:

C25

Submodel:

BASE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

L6

Liter:

4.1

CID:

250

Engine Family:

CHEVROLET L6 GAS

Engine Size:

4.1L/250

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

D

Region:

USA

Make:

GMC

Model:

C25

Submodel:

BASE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.0

CID:

305

Engine Family:

Chevy small block Gen I

Engine Size:

5.0L/305

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

U

Region:

USA

Make:

GMC

Model:

C25

Submodel:

BASE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.7

CID:

350

Engine Family:

Chevy small block Gen I

Engine Size:

5.7L/350

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

L

Region:

USA

Make:

GMC

Model:

C25

Submodel:

BASE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

6.6

CID:

400

Engine Family:

Chevy small block Gen I

Engine Size:

6.6L/400

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

R

Region:

USA

Make:

GMC

Model:

C25

Submodel:

BASE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

7.4

CID:

454

Engine Family:

Chevy big block Mark IV

Engine Size:

7.4L/454

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

S

Region:

USA

Make:

GMC

Model:

C25

Submodel:

HIGH SIERRA

Beginning Year:

1977

Ending Year:

1978

Engine Type:

L6

Liter:

4.1

CID:

250

Engine Family:

CHEVROLET L6 GAS

Engine Size:

4.1L/250

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

D

Region:

USA

Make:

GMC

Model:

C25

Submodel:

HIGH SIERRA

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.0

CID:

305

Engine Family:

Chevy small block Gen I

Engine Size:

5.0L/305

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

U

Region:

USA

Make:

GMC

Model:

C25

Submodel:

HIGH SIERRA

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.7

CID:

350

Engine Family:

Chevy small block Gen I

Engine Size:

5.7L/350

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

L

Region:

USA

Make:

GMC

Model:

C25

Submodel:

HIGH SIERRA

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

6.6

CID:

400

Engine Family:

Chevy small block Gen I

Engine Size:

6.6L/400

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

R

Region:

USA

Make:

GMC

Model:

C25

Submodel:

HIGH SIERRA

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

7.4

CID:

454

Engine Family:

Chevy big block Mark IV

Engine Size:

7.4L/454

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

S

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA CLASSIC

Beginning Year:

1977

Ending Year:

1978

Engine Type:

L6

Liter:

4.1

CID:

250

Engine Family:

CHEVROLET L6 GAS

Engine Size:

4.1L/250

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

D

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA CLASSIC

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.0

CID:

305

Engine Family:

Chevy small block Gen I

Engine Size:

5.0L/305

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

U

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA CLASSIC

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.7

CID:

350

Engine Family:

Chevy small block Gen I

Engine Size:

5.7L/350

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

L

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA CLASSIC

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

6.6

CID:

400

Engine Family:

Chevy small block Gen I

Engine Size:

6.6L/400

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

R

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA CLASSIC

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

7.4

CID:

454

Engine Family:

Chevy big block Mark IV

Engine Size:

7.4L/454

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

S

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA GRANDE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

L6

Liter:

4.1

CID:

250

Engine Family:

CHEVROLET L6 GAS

Engine Size:

4.1L/250

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

D

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA GRANDE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.0

CID:

305

Engine Family:

Chevy small block Gen I

Engine Size:

5.0L/305

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

U

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA GRANDE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

5.7

CID:

350

Engine Family:

Chevy small block Gen I

Engine Size:

5.7L/350

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

L

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA GRANDE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

6.6

CID:

400

Engine Family:

Chevy small block Gen I

Engine Size:

6.6L/400

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

R

Region:

USA

Make:

GMC

Model:

C25

Submodel:

SIERRA GRANDE

Beginning Year:

1977

Ending Year:

1978

Engine Type:

V8

Liter:

7.4

CID:

454

Engine Family:

Chevy big block Mark IV

Engine Size:

7.4L/454

Drivetrain:

RWD

Application Notes:

Universal Converter; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit; Federal and California Emissions, Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details., Pre-OBDII Heavy Duty Unit

Engine VIN Code:

S

Region:

USA