Before you bolt on aftermarket headlights for your GMT800 Silverado, Sierra, or Avalanche, do these two things first. UV coating and housing seal can prevent early failure.
Don’t Install Aftermarket GMT800 Headlights Until You Do This Read Post »
Running ACDelco 41-983 plugs gapped at .045″ on the 8.1L Vortec — a noticeable improvement over .060″. Broke my wires mid-job on a Friday afternoon and discovered LS wires fit in a pinch. Here’s the full breakdown including wire brands, the PCV plug-eating issue, and what to do when you’re stuck.
My 2002 Avalanche 2500 8.1L Vortec had startup valvetrain chatter every cold start on 5W-30 synthetic. Switched to Shell Rotella T4 15W-40 — noise gone. Here’s what happened, why it worked, and what to check before you change anything.
8.1L Vortec Startup Chatter Fixed: Why I Switched from 5W-30 to Rotella T4 15W-40 Read Post »
A real-owner install writeup for the Boost Auto wireless charging pad on the 99–02 and 03–07 GMT800 center console. Covers mounting, wiring tips for trucks without a rear 12V outlet, and the one trick that makes the dash connection actually doable.
Truck battery dies overnight? Learn how to find a parasitic battery draw on Silverado, Sierra, Tahoe & Suburban trucks — GMT400 to K2XX.
How to Find a Parasitic Battery Draw on GMT400, GMT800, GMT900 & K2XX Trucks Read Post »
What years are GMT800? Get the exact model years, trucks and SUVs included, key changes by year, and how to spot a GMT800 fast.
What Years Are GMT800? Full Breakdown Read Post »
GMT800 vs GMT400 towing comes down to power, brakes, gearing, and feel. Here’s how each GM truck platform stacks up when it’s time to pull.
GMT800 vs GMT400 Towing: Which Pulls Better? Read Post »
Low oil pressure at hot idle on a 4.8, 5.3 or 6.0 GMT800? Confirm it with a mechanical gauge before spending money — a full diagnosis covering the sender, sensor screen, pickup tube O-ring, oil pump and when to stop driving.
GMT800 Hot-Idle Low Oil Pressure: 5.3L and 6.0L Diagnosis and Pickup Tube O-Ring Guide Read Post »
Find expert fixes for Chevy/GMC Squarebody, GMT400/OBS, GMT800, and GMT900 truck issues like 4L60E slipping and AFM lifter tick at FullSizeChevy.com forum.
Auto repair shop near me? Read this first — Squarebody, GMT400/OBS, GMT800, GMT900 Read Post »
Before buying a used LS3 for Squarebody, GMT400/800/900 trucks, verify the 58x reluctor wheel, E38 ECM, correct oil pan, fitment, VIN authenticity, and request a compression test for a reliable swap.
Used LS3 For Your Squarebody, GMT400, GMT800, GMT900: What To Check Before You Buy Read Post »
