JDMSPEED Ignition Lock Cylinder 7-Pin Starter Switch LS105 Replacement with 2 Keys for GMC/Chevy 1967–1979, OEM Fit

JDMSPEED's 7-pin ignition lock cylinder starter switch is a direct-fit replacement for many GMC and Chevrolet trucks from the late 1960s through the 1970s and selected late-1980s medium-duty models, and it ships with two keys for immediate use.

This ignition lock cylinder by JDMSPEED is designed to replace worn or damaged starter switches and restore reliable starting and steering lock functions. Manufactured from durable alloy, the unit is supplied with two keys and is engineered to match OEM-style electrical and mechanical fitments for vehicles listed by part numbers 1116683, 1125, LS105, LS411, and US84. The component has been bench-tested for quality and performance prior to shipping and fits a broad range of classic GMC and Chevrolet models plus specific heavier-duty trucks from the late 1980s.

Will this ignition switch fit my classic GMC or Chevy from the 1967–1979 era?

Yes — the JDMSPEED LS105 7-pin ignition lock cylinder is intended as a direct replacement for many 1967–1979 GMC and Chevrolet passenger and light-truck models. Confirm compatibility by matching your existing part number or visual connector style to the listed references.

• Replaces part numbers: 1116683, 1125, LS105, HPLS105, LS411, US84
• Fits GMC and Chevy models from 1967 through 1979
• Cross-check your original connector: 7-pin plug required

How difficult is installation and what does "plug-and-play" mean here?

Installation is straightforward for anyone comfortable with basic automotive electrical work; the unit is a direct replacement that uses the same 7-pin connector and mounting points as the factory part. "Plug-and-play" means you do not need to modify wiring or the dash — remove the old cylinder, plug in the new unit, secure it, and test operation.

• Uses existing 7-pin harness — no splicing required
• Same mounting footprint as original OEM cylinder
• Comes with two keys so you can start and lock immediately

What vehicles beyond 1967–1979 are supported by this replacement?

In addition to classic GM trucks, this JDMSPEED ignition cylinder replaces certain medium-duty GMC and Chevrolet models from the late 1980s and early 1990s where the same part numbers were used. Always verify fitment by checking your current part number and the 7-pin connector configuration.

• GMC: B6000 (1988–1991), C6000/C7000 (1988–1990), P-series models (1988–1990)
• Chevrolet: B60 (1988–1991), C70 (1988–1990), P20/P30 (1988–1990)
• Replaces stock assemblies on specified model years listed above

What are the construction and quality details of this JDMSPEED cylinder?

The ignition lock is machined from high-quality alloy to deliver strength and corrosion resistance for long-term service. Each unit is inspected and performance-tested before leaving the factory to help ensure reliable mechanical action and electrical continuity when installed.

• Durable alloy construction for strength and wear resistance
• 100% quality inspection and performance testing prior to shipment
• Supplied with two matched keys to prevent immediate rekeying

Who is this for? JDMSPEED's ignition lock cylinder is aimed at owners and restorers of classic GMC and Chevrolet trucks (1967–1979) who need a reliable, OEM-style replacement without custom wiring, plus fleet or service technicians maintaining compatible late-1980s medium-duty models. If you want a plug-and-play swap that restores starting, accessory, and steering-lock functions with two ready-to-use keys, this unit is a practical choice.