Author: Jimmy O'Riley

CVT Gearbox vs Automatic Gearbox: How Belts and Fixed Gears Produce 5 Key Differences What Is the Difference Between a CVT Gearbox and an Automatic Gearbox? A CVT gearbox uses a belt and pulley system for a stepless range of gear ratios, while an automatic gearbox uses a fixed set of gears, typically 6 to 10, shifted through a planetary gear set. Both types shift without a clutch pedal. A CVT adjusts smoothly with no distinct gear changes. An automatic shifts between fixed points, such as first, second, and third gear. How Does a CVT Gearbox Work? A CVT gearbox…

A Gearbox Jack Adaptor Converts a Standard or Transmission Jack to Support Gearbox Removal, with Most Models Rated to 500kg A gearbox jack adaptor is a fitting that attaches to a jack to hold a gearbox securely during removal or installation. It either converts a standard floor jack into a transmission jack, or adds adjustable support to an existing transmission jack. Most gearbox jack adaptors carry a 500kg (1,100 lb) capacity and cost between £30 and £175, depending on type. What Is a Gearbox Jack Adaptor? A gearbox jack adaptor is a cradle, tray, or plate that replaces a jack’s…

Gearbox Solenoid: 6 Signs of Failure and What Replacement Costs What Is a Gearbox Solenoid? A gearbox solenoid is an electro-hydraulic valve that controls the flow of transmission fluid to change gears in an automatic transmission. It receives an electrical signal from the transmission control module (TCM) and opens or closes to direct fluid pressure to a specific clutch pack. Most vehicles use 2 to 8 solenoids, mounted on or inside the valve body. Common types include shift solenoids, which select the gear, pressure control solenoids, which regulate fluid pressure, and the torque converter clutch (TCC) solenoid, which locks the…

What Is the Ford AOD Transmission? The Ford AOD is a 4-speed automatic transmission with a mechanically controlled overdrive fourth gear. AOD stands for Automatic OverDrive. Ford built it from 1980 to 1993 as its first mainstream automatic transmission with a built-in overdrive gear, replacing older 3-speed automatics across most of its rear-wheel-drive lineup. When Was the Ford AOD Transmission Introduced? Ford introduced the AOD for the 1980 model year. The design traces back to a 1960s project called XT-LOD (Extension Lock-Up Overdrive), which Ford revived in 1974 under the name FIOD (Ford Integrated Overdrive) before finalizing it as the…

What Are the Signs of a Faulty Gearbox? The main signs of a faulty gearbox are difficulty shifting gears, grinding or whining noises, gears slipping out of position, a burning smell, fluid leaks, delayed engagement, and a dashboard warning light. What Counts as a Faulty Gearbox? A faulty gearbox is one that no longer shifts gears smoothly, holds a gear reliably, or transfers engine power to the wheels the way it was designed to. Common causes include worn synchronizers, damaged gear teeth, worn clutch plates, low or degraded fluid, and failing electronic solenoids. A well-maintained gearbox typically lasts between 100,000…

What Is a Gearbox? A gearbox is the set of gears and casing that changes the ratio between an engine’s rotation speed and a vehicle’s wheel speed. It sits between the engine and the wheels, and it lets a vehicle start from a stop, climb a grade, and cruise at highway speed using one engine. Gearboxes come in five main types, average 150,000 to 200,000 miles of service life, and give off distinct warning signs before they fail. How Does a Gearbox Work? A gearbox changes the ratio between engine speed and wheel speed. Gears of different sizes mesh…

Continuously Variable Transmission (CVT): How It Works and 5 Common Problems A continuously variable transmission, or CVT, is a type of automatic gearbox that shifts through an infinite range of ratios instead of a fixed set of gears. Two variable-diameter pulleys connected by a steel belt or chain create the ratio change, which keeps the engine near its most efficient RPM at any road speed. Automakers like Toyota, Honda, Subaru, and Nissan build CVTs into most of their compact and mid-size lineups, since the design can improve fuel economy by up to 10% over a traditional stepped automatic. What Is…

Planetary Gearbox: How It Works, Gear Ratio Formulas, and Where It’s Used What Is a Planetary Gearbox? A planetary gearbox is a gear system built around a central sun gear, planet gears, and a ring gear, all connected by a rotating carrier. It is also called an epicyclic gearbox. A well-documented early example is the Ford Model T’s transmission, which used a two-speed planetary gearset from 1908 to 1927. The sun gear sits at the center of the assembly. Planet gears mesh with the sun gear and revolve around it, similar to planets orbiting a star, which gives the system…

Hydroelectric Gearbox: How It Works, 3 Main Types, and When It’s Skipped What Is a Hydroelectric Gearbox? A hydroelectric gearbox is a mechanical device that connects a water turbine to an electrical generator and increases the turbine’s rotational speed to the level the generator needs. It is also called a speed increaser or a step-up gearbox. Water turbines, especially in small or low-head plants, often spin too slowly to drive a generator efficiently on their own. The gearbox sits between the two components. It multiplies the turbine’s low RPM into the higher RPM a generator needs to produce electricity at…

CVT Gearbox Repairs Address Problems Like Judder, Slipping, and Overheating in Continuously Variable Transmissions A CVT gearbox repair is any fix applied to a continuously variable transmission, ranging from a fluid change to a full replacement. CVTs use a belt or chain and pulley system instead of fixed gears, so repairs often differ from traditional automatic transmission work. Cost and repair options vary by symptom, vehicle brand, and how early the problem is caught. What Is a CVT Gearbox? A CVT, or continuously variable transmission, is a gearbox that uses a belt or chain riding between two variable-diameter pulleys instead…