The idler gear design has been upgraded to accept tapered roller bearings. This new design has some outstanding advantages, firstly the tapered bearings eliminate all gear end float, resulting in reduced transfer case gear slap and nil bore wear. Unlike the original needle roller bearings that brinell the running surface of the bore, if the tapered bearing outer surfaces wear they can be easily replaced whilst retaining the same gear.
A Note on Gear Noise: In some installations gear noise or singing will be evident when driving in high and low range. This is due to the gear form, pitch and pressure angle changing from standard to achieve the different ratios required for under / overdriving. There are more than 1000 installations around the world performing flawlessly but don’t expect factory quiet gears when changing your transfer case ratio’s.
This gear set is to suit 4 speed models 08/1980 to 10/1982 with a 34mm diameter idler shaft.
High range ratio 1.08:1 or 8% under-drive.
This ratio is ideal for vehicles fitted with 35" or larger tyres requiring an increase in engine revs to regain lost on road performance. 35" tyres will give approximately 20% reduction in engine revs. If your vehicle is fitted with 35" tyres and a 4-speed gearbox behind an F, B or H series engine the under-drive will give you an increase in engine revs of approximately 180rpm at 100km/h or 2420rpm instead of 2240rpm.
Alternatively, if your vehicle is fitted with 35" tyres and a 5-speed gearbox behind a 2F, B, 2H or 1HZ series engine. The under-drive will give you an increase in engine revs of approximately 151rpm at 100km/h or 2043rpm instead of 1892rpm.
Alternatively, if your vehicle is fitted with 35" tyres and a 5-speed gearbox behind a 3F, or HD series engine. The under-drive will give you an increase in engine revs of approximately 157rpm at 100km/h or 2129rpm instead of 1972rpm.
Low range ratio 3.05:1 or 55% reduction
Multiply this 3.05:1 by the 1st gear ratio of 4.843:1 and the differential ratio of 4.11:1 will give you a final drive ratio of 60.7:1 which is a vast improvement on the standard final drive ratio of 36.1:1.
The extra low range transforms your Toyota into an unstoppable off road machine.
Vehicles fitted with automatic transmissions, standard or other wise can also take advantage of the extra low gearing in low range as a dramatic improvement in engine braking is achieved giving much improved off road performance and increased safety.
- Input gear (no seal runner)
- Idler gear
- Low range output gear
- High range output gear
- Output gear bearings
- Idler gear tapered bearings
- Idler shaft
- Lock washer
- Lock Nut