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GM Confirms Gen-3 10-Speed Valve Body: What Changed vs. Gen-2 (10L60/80/90) Service Bulletin # 25-NA-334
GM released a Gen-3 service valve body for 10L60/80/90. It improves robustness and sediment control, removes the auxiliary body, relocates key solenoids, simplifies harnessing and flow, deletes the internal TBV lineup on certain RPOs, and includes a revised bolt kit. First field units appeared around Aug 2025; bulletin issued Oct 29, 2025.
Tallest Tire on a Stock Silverado 1500 ZR2 (No Mods) — Fitment Guide
Truck: 2024 Chevrolet Silverado 1500 ZR2 Goal: Fit the tallest tire possible without any modifications (no trimming, no spacers, no level kit) and document real‑world results. TL;DR It fits: An LT285/75R18 (~35") mounted on OEM 18" ZR2 wheels fits without trimming for normal driving. Edge case rub: At full steering lock while reversing into a driveway , there is a faint rub only as the suspension compresses over the bump . Daily driving and forward lock tests were clea
Dialing In Tire Pressure After Upsizing to LT285/75R18 (ZR2 Case Study)
Swapped my 2024 Silverado 1500 ZR2 from 275/70R18 to the exact LT285/75R18 E tires used on the Silverado EV Trail Boss. Fitment is clean—only a faint rub at full lock in reverse as the suspension compresses; no trimming yet. The big question is PSI. Don’t copy the EV’s ~56 psi placard (that truck’s ~3,000 lb heavier), and don’t stay at stock ~38 either. With LT-E you set pressure by load: start 46–48 psi cold empty; 58–62 psi rear when towing; fine-tune via hot-rise/tread che
6.6L Duramax Diesel Engine
EPA Issues Guidance to Fix DEF Derates: What the New Rule Means for Your 3.0 Duramax
If you’ve been driving your 3.0 Duramax-equipped truck or SUV, you're likely familiar with the frustration of a Diesel Exhaust Fluid...
The Devastating Consequences of Fuel Contamination in Your Duramax Diesel: DEF vs. Gasoline
For Duramax diesel owners, the fuel system is the lifeline of your vehicle’s performance, delivering the power and efficiency you rely...
The Great Debate: To Plug or Not to Plug - Block Heaters in Duramax Diesel Engines
Welcome to DuramaxNews.com , where we dive deep into everything regarding Duramax diesel engines in Chevrolet Silverado and GMC Sierra...
3.0L Duramax Diesel Engine
LM2 3.0 Duramax: GM Issues Special Coverage for Coolant Control Valve (N252508341)
Release: September 2025 • Bulletin: N252508341 • Applies to (LM2 3.0L Duramax):Chevrolet: Silverado 1500 (2021–2022), Suburban...
EPA Issues Guidance to Fix DEF Derates: What the New Rule Means for Your 3.0 Duramax
If you’ve been driving your 3.0 Duramax-equipped truck or SUV, you're likely familiar with the frustration of a Diesel Exhaust Fluid...
EPA's 2027 Emissions Standards: What It Means for Your 3.0 Duramax Diesel
The landscape of automotive emissions is constantly evolving, and for Duramax diesel enthusiasts, a significant change is on the horizon....
Other Diesel News
RECALL - Automatic Exterior Lights May Not Activate As Required
NOTE- Canadian Trucks Only N232431050-10: CMVSS Noncompliance Recall - Automatic Exterior Lights May Not Activate As Required - (Mar 26,...
Buyers Market -
GM Confirms Gen-3 10-Speed Valve Body: What Changed vs. Gen-2 (10L60/80/90) Service Bulletin # 25-NA-334
GM released a Gen-3 service valve body for 10L60/80/90. It improves robustness and sediment control, removes the auxiliary body, relocates key solenoids, simplifies harnessing and flow, deletes the internal TBV lineup on certain RPOs, and includes a revised bolt kit. First field units appeared around Aug 2025; bulletin issued Oct 29, 2025.
Tallest Tire on a Stock Silverado 1500 ZR2 (No Mods) — Fitment Guide
Truck: 2024 Chevrolet Silverado 1500 ZR2 Goal: Fit the tallest tire possible without any modifications (no trimming, no spacers, no level kit) and document real‑world results. TL;DR It fits: An LT285/75R18 (~35") mounted on OEM 18" ZR2 wheels fits without trimming for normal driving. Edge case rub: At full steering lock while reversing into a driveway , there is a faint rub only as the suspension compresses over the bump . Daily driving and forward lock tests were clea
Dialing In Tire Pressure After Upsizing to LT285/75R18 (ZR2 Case Study)
Swapped my 2024 Silverado 1500 ZR2 from 275/70R18 to the exact LT285/75R18 E tires used on the Silverado EV Trail Boss. Fitment is clean—only a faint rub at full lock in reverse as the suspension compresses; no trimming yet. The big question is PSI. Don’t copy the EV’s ~56 psi placard (that truck’s ~3,000 lb heavier), and don’t stay at stock ~38 either. With LT-E you set pressure by load: start 46–48 psi cold empty; 58–62 psi rear when towing; fine-tune via hot-rise/tread che
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