Have you checked the tranmission fluid lately? Have you had the filter and fluid changed lately?
ONLY the 4WD models. To check to see if yours is 4WD or 2WD - look under the rear of the vehicle, If you can see a driveshaft coming from the front of the vehicle and operating a differential on the rear axle then you DO have 4WD. If by "on-demand" you mean that YOU can engage it or dis-engage it at YOUR discretion - no. The 4WD engages and disengages automatically as wheel slippage is "sensed" by the transmission and the onboard computer.
Every time you engage the clutch, the clutch disengages from the transmission/engine. Which in term engine revs up, until you disengage the clutch.
The torque converter and clutch are the point where the engine and the transmission engage.
The transmission may not shift or engage in forward or reverse until the car warmed up for a few reasons. Two examples of why the transmission will not engage is low or no fluid levels or a leak.
Bad transmission rebuilder
transmission won't engage when you push the button on john deer 155c automatic
To engage or disengage the engine from the transmission.
Does the transmission engage when you shift it into drive?
Yes It Wil If The Vacuum Leak Is In A Hose That Gos To you Transmission
Low fluid level if your lucky.
When climbing a steep incline. The automatic transmission will always try to engage a high gear.
It is possible that the transmission bands are out of adjustment. They are not able to engage because of the maladjustment.