Chevrolet K10/K20 Pickup
Square body, 1973–87
Factory gearing, tires, angles and brakes for the K10/K20 Pickup, and what the usual upgrades do to it. Every number is from the maker's own figures unless the calculators say otherwise. A few figures here are still waiting on a factory document; the calculators mark them.
Trims
6 we have figures for| Trim | Tire | Transmission | Axle | Angles | Clearance | Open |
|---|---|---|---|---|---|---|
| 1973-76 K10, 6-cyl, standard tire (G78-15B) | 27.4 | Muncie SM465 4-speed manual, Turbo Hydra-matic 350 3-speed automatic | — | 36 · 22 · 18 | 7.1 in | Use → |
| 1975 K10 Fleetside SWB 117.5 in, V8 (L78-15B) | 28.6 | Muncie SM465 4-speed manual, Turbo Hydra-matic 350 3-speed automatic | — | 36 · 22 · 18 | 7.1 in | Use → |
| 1975 K10 Fleetside LWB 131.5 in, V8 (L78-15B) | 28.6 | Muncie SM465 4-speed manual, Turbo Hydra-matic 350 3-speed automatic | — | 36 · 20 · 18 | 7.1 in | Use → |
| 1975 K20 Fleetside 131.5 in (8.75-16.5C) | 30.0 | Muncie SM465 4-speed manual, Turbo Hydra-matic 400 3-speed automatic | — | 37 · 23 · 20 | 7.0 in | Use → |
| 1979 K10 (L78-15B) | 28.6 | Muncie SM465 4-speed manual, Turbo Hydra-matic 350 3-speed automatic | 2.76 / 3.07 / 3.4 / 3.73 / 4.11 | 36 · 22 · 18 | 7.1 in | Use → |
| 1979 K20 (8.75-16.5C) | 30.0 | Muncie SM465 4-speed manual, Turbo Hydra-matic 400 3-speed automatic | 3.73 / 4.1 | 37 · 23 · 20 | 7.0 in | Use → |
Size
- Wheelbase
- 117.5 in to 131.5 in
- Front overhang
- 33 in
- Rear overhang
- 41 in
- Height
- 67 in
- Body
- Pickup
- Stock tires
- 27.4, 28.6, 30.0
Transmissions and low range
- Muncie SM465 4-speed manual (granny low)
- 6.55 · 3.58 · 1.7 · 1
- Turbo Hydra-matic 350 3-speed automatic
- 2.52 · 1.52 · 1
- Turbo Hydra-matic 400 3-speed automatic
- 2.48 · 1.48 · 1
- 700R4 / 4L60(-E) 4-speed automatic
- 3.059 · 1.625 · 1 · 0.696
- Low range, np203
- 2.01:1
- Low range, np205
- 1.96:1
- Low range, np208
- 2.61:1
Axles
- Front
- Dana 44 (K10/most K20); Dana 60 on some heavy K20
- Rear
- GM 8.5 in 10-bolt semi-float (K10); GM 10.5 in 14-bolt full-float (K20)
- 2.76 ratio
- 1979 K10 (L78-15B)
- 3.07 ratio
- 1979 K10 (L78-15B)
- 3.4 ratio
- 1979 K10 (L78-15B)
- 3.73 ratio
- 1979 K10 (L78-15B), 1979 K20 (8.75-16.5C)
- 4.1 ratio
- 1979 K20 (8.75-16.5C)
- 4.11 ratio
- 1979 K10 (L78-15B)
- Ratios made for it
- 3.73 · 4.1 · 4.56 · 4.88 · 5.13
Brakes
- Front rotor
- 11.87 in, 301 mm
- Front caliper piston
- 75.0 mm
- Rear drum
- 11.15 in, 283 mm
- Rear
- drum (11.15 x 2.75 in)
Suspension
- Front
- solid axle on leaf springs
- Rear
- leaf springs, solid axle
- Rear layout
- Leaf springs
Fuel economy
- EPA highway, automatic
- 17 mpg
- EPA highway, manual
- 16 mpg
- Rated years
- 1984–1987, 4WD
Aftermarket bumpers
7 listedMakers almost never publish angles, bottom heights or how far a bumper tucks, so these fill in as owners measure them. Measured yours? Add it on the rig page and every owner of this K10/K20 Pickup sees how it does on their tires and lift.
Front 5
- Chassis Unlimited 1973-1991 CHEVY/GM Front Diablo Winch Bumper$1,611 · winch ready
- Chassis Unlimited 1973-1991 CHEVY/GM Front Octane Winch Bumper$1,402 · winch ready
- Iron Bull Bumpers 1973-1980 Chevrolet C10/C20/C30 K10/K20/K30 Front Bumper$1,700 · winch ready
- Iron Bull Bumpers 1981-1987 Chevrolet C10/C20/C30 K10/K20/K30 Front Bumper$1,700
- TrailReady 10100B Chevy Silverado 1500 1981-1988 Extreme Duty Front Bumper Winch Ready Base$3,654 · winch ready
Rear 2
Every calculator, set up for the K10/K20 Pickup
Source: auto-brochures.com. Dana 44 uses different carriers above and below the 3.73/3.92 break; 14-bolt full-floater 4.10-and-down vs 4.56-and-up carriers differ.
Use at your own risk. These calculators are here to help you plan and to inform your decisions, not to sign off on a build. Many numbers are estimates worked out from factory figures, and some factory figures are not yet confirmed. Check every number against your own truck, its manuals and a qualified shop before you buy parts, cut, weld, lift, regear or drive on it. Long Range Desert Tools is not liable for anything you do based on these calculators or their results. The full terms are in our policies.