![]() ![]() Take the car for a ride and when you get to 40 mph flip the switch on and you should notice a drop in motor RPM.Īlways switch on and off with the motor pulling the car, this way the motor and not the drive train will adsorb the change in RPM. It takes shaft RPM to build enough pressure to engage the gearset.įind the switch and with the motor off you should hear the solenoid click when you turn it on and off. The solenoid switches oil porting inside the O/D to control when it is in direct drive (no power) or overdrive (power on).Īnytime the drive shaft turns it runs an oil pump which builds up oil pressure and when powered this oil pressure changes flow path to engage a cone clutch with the plantary gearset. This controls the overdrive operation, like John mentioned. In your pix, you can just see the solenoid on the far side of the O/D just behind the lower site tube port. It reduces the overall gearing by 20 on 3rd and 4th gears. Overdrive is an additional 'epicyclic' gearbox bolted at the back of the normal gearbox (necessitating a shorter propshaft). I forgot to add that you should have a switch somewhere that controls power to a solenoid on the overdrive. The GT6 has aways been offered with an optional Laycock de Normanville D-Type overdrive. Hi, when I used ATF on a hot day 95 plus, it would not stay engaged, it would slip back to direct drive. ![]()
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