GT-LT95 Overdrive

The GT-LT95 Overdrive is a true all-range overdrive that has been designed to fit onto the PTO flange area of the Land Rover LT95 gearbox. This means that you can enjoy a 28% overdrive in any gear, including reverse, and in high or low range. 

In conjunction with Global Roamer Corporation of Canada, we have developed a robust overdrive that can handle anything the LT95 main gearbox can handle, so you can enjoy quieter, more fuel-efficient cruising on motorways, along with the ability to split every gear while towing heavy loads.

Sometimes low range is just a little too low. This is particularly true when you’re traversing deserts, or on those long sandy beaches and tracks. This is where having the ability to overdrive all gears while in low range really helps. The GT-LT95 Overdrive gives you that ‘dune-busting’ momentum that’s sometimes lacking in normal low range. 

The GT-LT95 Overdrive takes advantage of Global Roamer’s legendary epicyclic gear train technology which is used in their ROAMERDRIVE overdrive gearboxes. Also known as planetary gear sets, they are well known for their strength and silent operation. Global Roamer Corporation has a world-wide population of many thousands of overdrives using this very same ‘bullet-proof’ technology. 

Nothing was left to chance in our pursuit of the most durable LT95 overdrive gearbox. The very latest analysis software was used to accurately predict thermal loads and component stresses. What we learn here is applied in the machine shop, so you’re not stuck on a mountain trying to guess what went wrong. 

Advanced Lubrication

Many of the older style ‘layshaft’ overdrive units suffered badly from a lack of lubrication. The GT-LT95 Overdrive is designed to be open to the transfer case and utilises an innovative lubrication system that directs transfer case oil through the overdrive gearbox and back to the transfer case via a large precision deep groove ball bearing. 

The LT95 transfer case has a reputation for running hot, especially when operating at high speeds and ambient temperatures. To handle the extra heat generated by the overdrive gearbox, a finned transfer case cover is available, which doubles the heat rejection compared to the standard cover. If even more cooling is required, the finned cover has ports for an oil cooler and manual temperature sensor. 

As with all gearboxes, lubrication failure due to excessive heat, lack of supply, or both, is to be avoided at all costs. To assist this, we have teamed up with another Australian company, Gauge Innovations, to offer you an accurate digital temperature gauge. This very clever gauge uses simple lug-style sensors that can monitor both engine and gearbox temperature. Unlike traditional sensors, they operate independently of oil levels.

It even has an optional exhaust gas temperature thermocouple available; perfect for turbocharged applications. Not only does the gauge have simple-to-understand icons that change colour if safe limits are exceeded, but it also has a series of audible alarms so you never miss that vital warning. 

The GT-LT95 Overdrive uses the best manufacturing technology to cut, grind and hone components to the finest tolerances possible; durability and silent operation depend on it. 

Only the finest bearings and retaining rings are fitted, then the entire assembly is tensioned together using high tensile fasteners. To ensure a leak free installation, Viton ‘O’ rings and high tolerance ‘O’ ring grooves have been used on all mating surfaces. Even the rear cover flange bolts are sealed with Viton ‘O’ rings. 

At Garage Therapy, we pride ourselves on producing products of the highest quality. 

Overdrive gearboxes have been synonymous with Land Rovers for decades, so it was important that we produced an overdrive that would survive dusty outback Australia, yet be right at home on an award winning Suffix A doing the show circuits of Europe.