ceramic gears Cerma Ceramic Gear Box & Axle Treatment

Common symptoms of a differential that could benefit from Cerma: persistent gear whine that varies with vehicle speed (not RPM), howling sounds on deceleration, increased gear noise when towing or under load, higher-than-normal operating temperature, or gear oil that darkens/contaminates faster than expected. If your differential is making clunking or popping noises, that typically indicates mechanical damage (worn bearings, broken gear teeth, bad axle shafts) that Cerma cannot repair — have it inspected before treatment. For healthy differentials, Cerma works preventatively to extend service life significantly.

Yes. The 6oz bottle is specifically formulated for semi truck tandem axles (drive axle + trailing axle), Class 8 final drives, and heavy-duty commercial differentials from Dana, Eaton, Meritor, and Rockwell. For tandem axle setups, treat each axle separately — one 6oz bottle per axle housing. Fleet managers often see significant reductions in operating temperature and gear oil replacement intervals on treated axles, especially on long-haul routes and under heavy loads.

Cerma's SiC ceramic coating bonds to existing metal surfaces — it cannot rebuild metal that has been physically removed through wear, pitting, or damage. For early-stage ring and pinion wear (mild pitting, slight gear whine, elevated operating temps), Cerma can significantly slow further wear and often reduces noise. For advanced wear (deep pitting, chipped teeth, visible gear damage, clunking sounds), Cerma is not a repair product — a differential rebuild or gear replacement is needed. Think of Cerma as preventative ceramic armor, not a mechanical patch.

Yes — Jeep and off-road owners are one of our core customer groups. Cerma is compatible with all off-road differential setups: Dana 30, Dana 35, Dana 44, Dana 60, Ford 8.8", 9.75", 10.25", GM 14-bolt, Toyota 8" and 9.5", and aftermarket housings. Safe for air lockers (ARB), electronic lockers (Eaton E-Locker), limited slips (Detroit Truetrac, Eaton), and spools. The ceramic coating is especially valuable for off-road use where differentials see water crossings, high-heat trail runs, rock crawling, and extreme articulation. Treat both front and rear differentials for balanced drivetrain protection.

Yes. Electric vehicle gearboxes (also called reducer units or differential-integrated motors) use gear oil and benefit from ceramic protection just like traditional differentials. This applies to Tesla Model S/3/X/Y drive units, Rivian R1T/R1S motors, Lucid Air motors, Ford F-150 Lightning, Mustang Mach-E, Hyundai Ioniq 5/6, Kia EV6, and most other EVs. EV motors run at very high RPM (up to 20,000+), which makes gear protection particularly valuable. Before treating, verify the gearbox uses standard gear oil (most do) — some manufacturers specify proprietary lubricants that should not be supplemented without dealer consultation.

Yes, both. Cerma is compatible with all transfer case designs: gear-driven (NP203, NP205, older heavy-duty setups), chain-driven (NP241, NP261, NP263, NP246 — most modern 4WD SUVs and trucks), and electronic full-time transfer cases (Subaru, AWD vehicles). The SiC particles bond to metal gears and chain drive sprocket surfaces equally well. If your transfer case uses ATF instead of gear oil (some chain-driven cases do), Cerma works in both fluid types — it bonds to metal regardless of fluid chemistry.

Yes — classic high-performance differentials love Cerma. Legendary housings like the Ford 9-inch (one of the strongest differentials ever built), GM 12-bolt, Chrysler 8.75", Dana 60, and Dana 44 were designed for heavy-duty service but typically show wear after decades of use in restored vehicles, hot rods, and drag cars. Cerma's ceramic matrix is especially valuable on these older high-torque applications where replacement gears are expensive and availability is limited. Safe for factory limited slips (Sure-Grip, Posi-Traction, Trac-Lok), aftermarket LSDs (Detroit Locker, Truetrac), and spools. Compatible with thick gear oils (85W-140, 80W-90) commonly used in muscle cars.

Yes — this is ideal timing. After a differential service with fresh gear oil, your housing has clean internal surfaces and new fluid — perfect conditions for the ceramic bonding process. Add Cerma through the fill plug with the vehicle on level ground, then drive normally. For best results, apply when gear oil is warm (after a short drive). The SiC particles will begin bonding to clean gear and bearing surfaces immediately, with full ceramic matrix development over the first 500–1,500 miles of driving.