New here. First older truck. 74 K20.

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Phoenix

Junior Member
Joined
Jun 14, 2019
Posts
12
Reaction score
5
Location
Ca
First Name
Jeff
Truck Year
1974
Truck Model
K20
Engine Size
350
Hey all, I'm new here. Just bought my truck a couple weeks ago.
 

1973c10

Full Access Member
Joined
Sep 25, 2015
Posts
6,376
Reaction score
24,013
Location
Oregon
First Name
Don
Truck Year
1973
Truck Model
C10
Engine Size
454
Welcome Aboard :boti:
 

75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
2,017
Reaction score
1,808
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
Congratulations.

One suggested upgrade, if it hasn't already been done, is to swap in an HEI distributor. HEI started in '75 as standard, so its an easy upgrade that really simplifies your ignition maintenance.

Your truck should be a TH350 and NP203, which may still be full-time 4WD, or may have been converted. Despite the chain drive, the unconverted NP203 is still extremely durable. The only downside is that there are a lot of parts moving all the time, so gas mileage suffers. However, its a great transfer case if you drive much in snow or mud and always want good traction.

Bruce
 

animal

Super Moderator
Staff member
Super Moderator
Joined
Jul 30, 2010
Posts
5,408
Reaction score
3,496
Location
Georgia
First Name
Lee
Truck Year
1986
Truck Model
c10 silverado
Engine Size
350ish
:welcome:
 

Charlie

Mopar by Birth. Chevy by Choice.
Joined
Aug 2, 2017
Posts
1,837
Reaction score
909
Location
Euless, Texas
First Name
Don
Truck Year
1974
Truck Model
Cheyenne 10 LWB
Engine Size
350/TH350/AC/4 BBL Quadrajet
:welcome:
 

WFO

Full Access Member
Joined
Jan 6, 2017
Posts
3,376
Reaction score
4,416
Location
Texas Panhandle
First Name
Dan
Truck Year
1986
Truck Model
K20
Engine Size
350
Welcome from the Texas Panhandle.
 

Phoenix

Junior Member
Joined
Jun 14, 2019
Posts
12
Reaction score
5
Location
Ca
First Name
Jeff
Truck Year
1974
Truck Model
K20
Engine Size
350
HEI already on the way! What’s the point of points!?
Congratulations.

One suggested upgrade, if it hasn't already been done, is to swap in an HEI distributor. HEI started in '75 as standard, so its an easy upgrade that really simplifies your ignition maintenance.

Your truck should be a TH350 and NP203, which may still be full-time 4WD, or may have been converted. Despite the chain drive, the unconverted NP203 is still extremely durable. The only downside is that there are a lot of parts moving all the time, so gas mileage suffers. However, its a great transfer case if you drive much in snow or mud and always want good traction.

Bruce
 

Old77

Administrator
Staff member
Admin
Joined
Aug 19, 2010
Posts
28,219
Reaction score
8,588
Location
Kansas City, Mo
First Name
Jacob
Truck Year
1977/1990/1991
Truck Model
C10 longbed/R1500 Burb/R3500 Dually
Engine Size
350/350/454
:welcome:
 

Phoenix

Junior Member
Joined
Jun 14, 2019
Posts
12
Reaction score
5
Location
Ca
First Name
Jeff
Truck Year
1974
Truck Model
K20
Engine Size
350
Congratulations.

One suggested upgrade, if it hasn't already been done, is to swap in an HEI distributor. HEI started in '75 as standard, so its an easy upgrade that really simplifies your ignition maintenance.

Your truck should be a TH350 and NP203, which may still be full-time 4WD, or may have been converted. Despite the chain drive, the unconverted NP203 is still extremely durable. The only downside is that there are a lot of parts moving all the time, so gas mileage suffers. However, its a great transfer case if you drive much in snow or mud and always want good traction.

Bruce
How can I tell if it’s been converted? Just see if it’s a different transfer case?
 

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