why does the 1991 Lincoln towncars transmission not have overdrive?Instead of going into overdrive it seems to go into neutral.But if you take it out of overdrive and leave it in drive it never goes into neutral while I'm driving.
Could be low fluid,a bad sensor or transmission going bad.
if their is no slipping or any other transmission issues and it is just only the loss of overdrive try replacing the brake light switch
Overdrive is for highway driving, which is great for gas mileage. Also, not to use overdrive when going up or down hills because it makes your transmission work harder. That's what I was told anyways.
The transmission is on its way out.You could drive the vehicle with the overdrive function turned off to buy some time.
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Overdrive relay switch behind the middle air vents..... Manual Transmission: the wires sometimes break if it is the type with the button on the gear/knob/ stick........... if it is a manual transmission.......the switch on the gearbox which tells when 4th gear is engaged can be faulty.....and will not allow the overdrive to engaged.
The overdrive should be switched off when you want to avoid unneccessary shifting. If you are driving on a hilly road, the vehicle will shift out of overdrive going uphill to maintain speed while pulling the vehicles weight up the hill, and shift into overdrive going down the hill to save fuel when additional engine power is not needed. When towing with an automatic transmission, the vehicle may tend to repeatedly shift in and out of overdrive due to the added weight. In scenerios such as these, you should turn off the overdrive to avoid the unneccesary shifting which puts more wear and tear on the transmission.
Answeri had the same problem of transmission not going into overdrive.i changed my thermostat and it works fine now.give it a try .
on the back of the drivers side head. it has an ign, gnd, and data wire going to it
mass air flow sensor