1973-1987 4x4 GM Truck LS Swap Parts, K5

LS swap parts for 1973-1987 4WD Chevy and GMC trucks and 1973-1991 4WD Blazer, Jimmy and Suburban: the Muscle Rods engine mount and frame bracket kit, cast iron LS manifolds, EFI fuel tanks for 6 and 8 foot beds and for the SUVs, fuel line and pump kits, aluminum radiators in two heights, oil pan parts and Long accessory drives.

Bolts to the factory transmission and transfer case
Made in the USA mount kit
Clears the factory A/C box and brake booster

Read the 1973-1987 4WD GM truck LS install guide before you start, then configure your 4WD truck in the kit builder.

$299.00 1973-1987 4WD GM Truck and 1973-1991 4WD SUV LS Engine Mounts and Frame Bracket Kit

$299.00 Cast Aluminum Retro LS Oil Pan Kit

$599.00 1973-1987 GM Truck EFI Fuel Tank Kit - 255 LPH Pump - 6' Bed

$669.00 1973-1987 GM Truck EFI Fuel Tank Kit - 400 LPH Pump - 6' Bed

$599.00 1973-1987 GM Truck EFI Fuel Tank Kit - 255 LPH Pump - 8' Bed

$669.00 1973-1987 GM Truck EFI Fuel Tank Kit - 400 LPH Pump - 8' Bed

$599.00 1973-1991 Blazer/Suburban Fuel Tank Kit - 255 LPH Pump

$669.00 1973-1991 Blazer/Suburban Fuel Tank Kit - 400 LPH Pump

$197.00 Fuel Pump and Fitting Kit 1987-1997

$399.00 Fuel Line and Regulator Kit - 255 LPH

$991.99 1967-1987 GM Truck Radiator 18.5" Tall (Auto Trans)

$885.99 1967-1987 GM Truck Radiator 18.5" Tall (Manual Trans)

$1,362.99 1967-1987 GM Truck Radiator 18.5" Tall (Manual Trans) with Fans

$1,468.99 1967-1987 GM Truck Radiator 18.5" Tall (Auto Trans) with Fans

$1,468.99 1967-1987 GM Truck Radiator 20.75" Tall (Auto Trans) with Fans - HD Cooling

$1,362.99 1967-1987 GM Truck Radiator 20.75" Tall (Manual Trans) with Fans - HD Cooling

$991.99 1967-1987 GM Truck Radiator 20.75" Tall (Auto Trans) - HD Cooling

$885.99 1967-1987 GM Truck Radiator 20.75" Tall (Manual Trans) - HD Cooling

$299.00 Cast Iron Exhaust Manifolds for LS Engines

1973-1987 4WD GM truck LS swap parts

Engine mounts and exhaust manifolds

EFI fuel tanks for 6 and 8 foot beds

Blazer, Jimmy and Suburban fuel tanks

Fuel line and pump kits

The 255 LPH line and regulator kit runs from the tank to a returnless LS fuel rail. The pump and fitting kit adds a Walbro 255 LPH pump to an existing sending unit, and its fit list starts at 1987.

Radiators, 18.5 inch standard cooling

Radiators, 20.75 inch HD cooling

Oil pan and pickup girdle

Accessory drives, Long

Long is the balancer length these drives are built around; match it to the balancer on your engine.

What comes in the 4WD truck LS mount kit

2 frame brackets
2 motor mounts
Hardware pack

1973-1987 4WD truck LS fitment notes

The mount kit sets the back of the LS block in the exact stock location, so the engine bolts straight to the factory transmission and transfer case.
If you switch to an LS based transmission and transfer case, you will likely need to move the factory transmission crossmember rearward.
Column shift linkage may need rework to clear headers.
Just about any factory GM LS oil pan can be used in this chassis.
The LS block clears the factory A/C box and the power brake booster.
Pickup tanks are listed for 1973-1987 C10, C15, K10 and K15 trucks with a 6 or 8 foot bed. Blazer, Jimmy and Suburban use their own 1973-1991 tank.
Each tank pairs an in-tank pump module with a sending unit, straps, vent filter, gaskets and hardware. Pick 255 LPH for up to 550 hp, or 400 LPH for supercharged or higher output builds.
Both radiator heights list K10, K15, Blazer and Suburban for 1967-1987, in automatic or manual versions, with fans installed or without.

Mount and chassis notes from the 1973-1987 4WD GM truck LS install guide. Tank, fuel line and radiator notes from each product listing.

1973-1987 4WD GM truck LS swap FAQ

Can I keep the factory transmission and transfer case in my 4x4?

Yes. The guide says the mounts locate the LS block in the stock position so it bolts to the factory transmission and transfer case. An LS based transmission and transfer case will likely mean moving the crossmember rearward.

Which oil pan works in a 1973-1987 4WD truck with an LS?

The guide says just about any factory GM LS oil pan fits this chassis. The Cast Aluminum Retro LS oil pan kit is also listed on this page.

Do the mounts fit a 1973-1991 K5 Blazer or Suburban?

The mount kit is named for 1973-1987 4WD GM trucks and 1973-1991 4WD SUVs, and the guide covers both.

Which fuel tank fits my 4WD truck?

Pickups go by bed length, 6 foot or 8 foot. Blazer, Jimmy and Suburban take the 1973-1991 SUV tank. Each comes with a 255 or 400 LPH pump.

1973-1987 4WD GM Truck LS Swap Kit Parts