1988-1998 4WD GM Truck LS Swap Kit Parts

Radiators

• 1988-1995 LS Radiator 28.25" Core Width (Auto Trans)
• 1988-1995 LS Radiator 28.25" Core Width (Manual Trans)
• 1988-1995 LS Radiator 28.25" Core Width (Auto Trans) with Fans
• 1988-1995 LS Radiator 28.25" Core Width (Manual Trans) with Fans
• 1988-1993 LS Radiator 34" Core Width (Auto Trans)
• 1988-1993 LS Radiator 34" Core Width (Manual Trans)
• 1988-1993 LS Radiator 34" Core Width (Auto Trans) with Fans
• 1988-1993 LS Radiator 34" Core Width (Manual Trans) with Fans

Fuel

• Fuel Pump and Fitting Kit 1987-1997
• Fuel Pump and Fitting Kit - Various 91-05 GM models
• 340 LPH Fuel Pump and Fitting Kit - Various 91-05 GM models
• Fuel Line and Regulator Kit - 255 LPH

Accessory drives

• Alternator and Power Steering Drive - Long
• Alternator and Power Steering Drive w/Pump - Long
• High Mount AC Compressor Drive w/Compressor - Long

Oil system

• Cast Aluminum Retro LS Oil Pan Kit
• Oil Pump Pickup Tube Girdle

What comes in the OBS 4WD LS mount kit

• 2 frame brackets
• 2 motor mounts with 1/4 inch bushing washers
• Hardware pack

OBS 4x4 LS swap fitment notes

• The mounts put the back of the LS block in the stock location, so it bolts to the factory transmission and transfer case.
• An LS-based transmission and transfer case will likely need the factory crossmember moved rearward.
• The factory LS truck oil pan can be used.
• The LS block clears the factory A/C box and power brake booster.
• The factory LS truck fan lines up with the factory shroud, and the truck alternator and power steering fit.
• The LS truck A/C compressor does not clear the frame. Use a high-mount A/C bracket.
• Factory column shift linkage may need changes to work around headers.

Notes from the 1988-1998 4WD GM Truck LS install guide.

OBS 4x4 LS swap FAQ