If you have the Triumph steering column, there is provision on the right hand side of the column to install a Triumph switch (see rack & pinion upgrade page.) Otherwise you can install a dash mounted switch such as that used on an MGB.ĭaimler aficionados may be interested to know that whilst the availability of overdrive as an option was mentioned in the 1959 SP250 launch material, it was never listed as an option after launch and records show that only two cars were built with this feature. You also need to consider the o/d switch location. We need to put a small bulge in the gap transmission cover to accommodate the slightly altered gearbox profile but this is not sufficient to require new carpeting. 4 speed manual gearbox with laycock overdrive on 3rd and 4th gears. Laycock overdrive removal - Volvo Owners. I have tried to simplify everything giving you an initial introduction to the Laycock Overdrive. The reduced engine rpm improves fuel (and oil) consumption, reduces noise and places less demand on the cooling system. Make sure you check the Vendor Showcase board often for sales and specials. The Laycock de Normanville overdrive operates on 3rd and 4th gear and gives you around 25mph per 1,000rpm in overdrive top. For me, this is one of the must-haves particularly if you use the car for touring and use motorways.
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