Parts
Buyer’s guides
The catalogue tells you what a part is. These tell you how to avoid buying the wrong one — the ratio arithmetic, the part-number grammar, and the details a used listing leaves out. All of it learned sourcing parts for our own cars.
Why a GDB needs a 3.545 rear diff
The final drive has to match the transfer gear, or the centre diff destroys itself. The arithmetic, and how to read it off a listing.
Reading Subaru STI six-speed gearbox numbers
What TY856 codes and 32000A assembly numbers tell you about generation, DCCD and front LSD — and when they contradict the listing.
Buying used drivetrain parts sight-unseen
What a listing has to state before it is safe to bid, why clutch-type beats helical on stage, and the Japanese terms that carry the real information.
No prices, deliberately
You will not find figures or links to live listings here. Prices move weekly, the hammer price is never the landed cost, and a guide that needs updating every fortnight stops being updated. What is here is the part that stays true.