Classic muscle
1965–1973 Ford Mustang small-block swap
289 to 302 to 351W. Front-end rebuild kits, motor mounts, exhaust hangers, ignition wiring — bagged and labeled by part number.
Free build guides · pre-bagged parts kits
The free guide already comes with the parts bagged for you.
Every download on FreeCarKits is a peer-reviewed, service-manual-style build guide — written by our in-house ASE-certified tech team and shipped with a matching, ready-to-install parts kit. No more hunting four forums, three retailers and a YouTube channel to swap a starter or wire a dual-battery setup.
- 1,840+free build guides
- 312vehicle platforms covered
- 14in-house ASE-certified techs
How it works
From "I want to swap my starter" to kit-on-the-bench in four chapters.
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Ch. 01
Pick your platform
Filter the library by year, make, model and engine — 312 platforms from a 1965 Ford Mustang to a 2024 Toyota Tacoma. Every entry shows whether a matching parts kit is in stock.
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Ch. 02
Grab the free guide
Download the build guide as a PDF — written by an in-house ASE-certified tech, peer-reviewed by the team, and printed with torque specs, wiring notes and a parts list.
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Ch. 03
Add the matching parts kit
Every guide is paired 1:1 with a pre-bagged kit. Add it to cart, and we ship the exact fasteners, gaskets, connectors and hardware called out in the guide — nothing extra to source.
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Ch. 04
Install with current schematics
Scan the QR code taped to the kit bag — it pulls the latest wiring diagram and torque-spec revisions for that build, free, for the life of the project. No more forum PDFs from 2014.
Where to start
Three doors into FreeCarKits. Pick the one you came for.
The catalog
Pre-bagged parts kits, paired 1:1 with a free guide.
The checkout path. Browse kits for 312 platforms — starters, dual-battery setups, lift kits, full restorations. Every kit ships with the matching PDF guide and a QR code for lifetime schematic revisions.
Shop kits → The library1,840+ free build guides, no email gate.
Pure documentation. Read the guide, decide later whether you want the matching kit. Drawn from OEM service manuals where available, written by our 14 in-house ASE-certified techs.
Browse guides → The credibilityWho writes these, and who's cited us.
The founder story, the technician roster, the AutoWeek award, the Grassroots Motorsports and Hot Rod features — for the gearhead who wants to vet the shop before handing over a credit card.
About & press →
Coverage, 1965 — 2024
Six representative builds across 312 vehicle platforms.
From a small-block swap on a first-gen Mustang to a first-owner brake job on a 2024 Tacoma — the kit and the guide live here, and the schematic is in the bag.
Late-model V8
LS-swap fuel & ignition harness
EV1 injectors, standalone ECU pigtails, O2 sensor extensions, fuel rail hardware. Pulled straight from OEM service manuals, redrawn by our wiring team.
Off-road / overlanding
Dual-battery & auxiliary lighting
Isolator kits, fused distribution blocks, relay harnesses, rocker-switch panels — paired with a guide that covers fusing, wire gauge and the actual torque on the battery terminals.
Import / JDM
2JZ, K-series, B-series & SR20 platforms
Timing-belt service kits, head-gasket sets, coil-on-plug conversion harnesses. Sourced from the OEM diagrams our wiring team redraws for the site.
Diesel work
Power Stroke, Cummins & Duramax service
DPF delete hardware, fuel-filter service kits, FICM harness repairs, starter and alternator kits. Guides note the emissions-law context up front, before the wrench turns.
First-owner basics
Brakes, starter, battery & first service
The weekend-warrior shelf — the jobs every first owner does in year two. Pad and rotor kits, AGM batteries, reman starters. Written so a first-timer can finish without a callback.
Verified operating facts
The numbers, as of Q1 2025 — straight from the spec sheet.
1,840+
free build guides live on the site
312
distinct vehicle platforms covered, 1965–2024
14
in-house ASE-certified technicians
218,000+
parts kits shipped since 2019
4.86/5
average post-install kit rating
94.7%
kit-fitment accuracy, free replacement on any mismatch
$186
average savings per project vs. sourcing parts individually (internal survey, n=4,118)
412,000+
registered DIYers across site, newsletter & Discord
Founded 2019 in Boulder, CO by former dealership service manager Marc Delaney and ASE Master Tech Renata Okafor. 27 full-time staff including 6 content engineers and 4 parts specialists.
Editorial validation
Named & cited by the publications gearheads already read.
- AutoWeek Gear Guide "Best Free DIY Auto Resource 2024"
- Grassroots Motorsports Featured as a top DIY resource
- Hot Rod Magazine Cited among top project-resource sites
- The Drive Included in the 2024 Buyers Guide
DIY safety note: For brake, fuel, airbag or high-voltage EV work, always consult a licensed mechanic. Our guides and kits support home repair — they do not replace professional certification.