Classic muscle · 1965–1979
1965–1973 Ford Mustang
284 guides
Starter swaps, ignition switch rebuilds, gauge cluster wiring and concours-correct restoration write-ups.
Browse Mustang guides →
Free Reference Library · Est. 2019
1,840+ free build guides & wiring diagrams, peer-reviewed by ASE-certified techs.
Every guide on FreeCarKits is written by an in-house technician, drawn from OEM service manuals, and paired 1:1 with a pre-bagged parts kit. Browse the library — no account, no paywall, no email gate.
- 1,840free guides
- 312vehicle platforms
- 14ASE-certified techs
Step 01 · Jump In
Find a guide by vehicle or system.
The library is browsable without an account. Pick a common entry point or use the full catalog at the bottom of the page.
Spotlight · Most-browsed platforms
Four core platforms the library covers end-to-end.
Modern truck · 2016–2024
2016–2024 Toyota Tacoma
196 guides
Dual-battery wiring, aux light installs, TRD suspension swaps and OEM trailer brake controller diagrams.
Browse Tacoma guides →
Off-road / overlanding · 2007–2024
2007–2024 Jeep Wrangler
221 guides
Aux switch bank wiring, axle swap write-ups, locker diagnostics and trail-friendly lighting schematics.
Browse Wrangler guides →
Budget commuter · 2001–2015
2001–2015 Honda Civic
308 guides
Alternator replacement, O2 sensor wiring, VTEC solenoid diagnostics and the workhorse 1.7/1.8L head-gasket walkthrough.
Browse Civic guides →
Browse by system
The full library, organized the way a DIYer actually searches.
Nine system categories. Every entry links to a peer-reviewed guide plus the matching pre-bagged kit.
01
Engine
312 guides
Gaskets, timing, sensors, swaps
02
Wiring & Electrical
486 guides
Schematics, connectors, grounds
03
Brakes
214 guides
Pads, rotors, calipers, lines
04
Suspension
188 guides
Springs, bushings, lift kits
05
Drivetrain
167 guides
Trans, diff, clutch, axle
06
Lighting
142 guides
HID, LED, aux, retrofit
07
HVAC
96 guides
Blend doors, compressors, blowers
08
Interior
121 guides
Upholstery, switches, trim
09
Restoration & Concourse
114 guides
Full tear-down write-ups, concours-correct fasteners, paint prep and metalwork
Press · April 2024
“The best free DIY auto resource of 2024. FreeCarKits does what the forums never managed — it pairs every schematic with a vetted, ready-to-ship parts kit, then lets you scan a QR code to get the latest revision for free.”AutoWeek Gear Guide See full press list →
By the numbers · Q1 2025
1,840+ free guides. Peer-reviewed. Built by 14 ASE techs.
- 1,840+ free build guides live on the site
- 312 distinct vehicle platforms covered
- 14 ASE-certified in-house techs
- 412k+ registered DIYers across site, newsletter & Discord
- 218k+ parts kits shipped since 2019
- 94.7% kit-fitment accuracy, free replacement guarantee