Marks 4WD Adaptors manufacture a heavy-duty 5-speed manual transmission to overcome the strength problems associated with the Hilux/4-Runner 4 and 5-speed gearboxes when fitted with larger engines.
The heavy duty 5-speed, (originally a Toyota Dyna truck gearbox) when fitted with the new adaptor, gearbox top, selectors and main output shaft etc will directly replace the Hilux/4-Runner 5-speed gearbox.
Marks 4WD Adaptors fully dismantled the gearbox and recondition it using all new bearings, seals etc. A new rear housing is fitted to the gearbox so that the vehicle’s original transfer case can be retained. The main output shaft in the gearbox is replaced with one that allows the Hilux/4-Runner coupling sleeve to mate it to the transfer case.
Marks 4WD Adaptors manufacture a special gear lever housing that has been designed to accept the standard Hilux/4-Runner 4-speed diesel and 5-speed diesel or petrol gear lever. The housing also allows the gear lever to emerge through the same hole in the transmission tunnel.
The heavy-duty 5-speed gearbox features a low 1st gear, which is ideal for rock crawling and general four wheel driving.
The gearbox has the following ratios: 1st 5.15:1 2nd 2.87:1 3rd 1.50:1 4th 1:1 and 5th 0.83:1 or 17% overdrive.
This gearbox has the same bolt pattern as the R151 gearbox found in the 3ltr diesel, 3ltr and 3.4ltr petrol Hilux, Surf and Prado vehicles.
The gearbox can be fitted to various engines including Toyota Hilux/4-Runner 4 cylinder petrol and diesel, Holden V6, V8, Chevy V6, V8, Oldsmobile V6, V8 and Buick V6, V8 engines
http://www.marks4wd.com/products/engine ... iluxt.html