The full 8.1L Vortec (Vortec 8100 / RPO L18) spec sheet: up to 340 hp, 455 lb-ft, 496 cubic inches, bore/stroke, and which trucks got it. It’s gas, not diesel.
8.1L Vortec Specs: Horsepower, Torque & Everything on the Vortec 8100 Read Post »
Most 2003–2006 GMT800 trucks shipped with no cabin air filter but the HVAC slot is molded in. A 20–30 minute retrofit: where it is, how to cut the opening without hitting the evaporator, and filter orientation.
GMT800 Cabin Air Filter Retrofit (2003–2006 Silverado & Sierra) Read Post »
A 99–02 GMT800 double-DIN swap done right: why it isn’t a direct fit, the correct conversion bezel, the dash tab you must trim, and the wiring/antenna adapters — no cut factory harness.
There is no single universal 8.1L L18 drive-by-wire pinout. This reference separates the 2001–2002 pre-MCE light-duty system from the 2003–2006 MCE system — P01 vs. P59 PCMs, split vs. integrated throttle hardware, the year-specific cam/crank cavity difference, and what actually has to match before you build a standalone L18 harness.
GM 8.1L Vortec L18 Drive-by-Wire Wiring: 2001–2002 vs. 2003–2006 Light-Duty Pinouts Read Post »
GMT400 vs GMT800 Suburban comes down to feel, simplicity, comfort, and use. Here’s how each platform stacks up for real truck guys.
GMT400 vs GMT800 Suburban: Which Wins? Read Post »
Your GMT800 tracks engine run-time, and most owners never knew. Here’s how to read hidden engine hours on a 1999–2002 Silverado or Sierra — and why it matters when you’re buying used.
How to Check Hidden Engine Hours on a GMT800 (1999–2002 Silverado/Sierra) Read Post »
A practical, owner-level rebuild guide for the 1999–2006 GMT800 tailgate — how to diagnose and fix the latches, cables, hinge, and handle before the gate sags, sticks, or drops.
GMT800 Tailgate Rebuild Guide: Latch, Cable, Hinge & Handle (1999–2006 Silverado/Sierra) Read Post »
A practical, platform-aware rundown of the Silverado mods worth the money — lift and wheels, exhaust and intake, bed and interior — from GMT800 to T1XX, with the deep-dive guide for each.
Best Silverado Mods: The Upgrades Actually Worth Doing (GMT800 to T1XX) Read Post »
A practical, platform-specific restoration guide for full-size Chevy and GMC trucks — Squarebody, OBS/GMT400, and GMT800. What to buy, how to inspect it, and the exact order to do the work so you don’t spend twice.
Classic Chevy & GMC Truck Restoration Guide (Squarebody, OBS, GMT800) Read Post »
GMT800 (1999–2006): The Silverado & Sierra Owner’s Hub The GMT800 is GM’s full-size truck and SUV platform built from 1999
GMT800 (1999–2006) Silverado & Sierra: The Complete Owner’s Hub Read Post »
