There are several reasons that a car may stall only in reverse, the best way to narrow down the issue is to use a diagnostic tool. The diagnostic tool will show which sensors on the transmission may be malfunctioning enough to stall the engine.
Because reverse is a lower ratio gear than drive and puts less load on the engine.
If you mean each time you engage car in any gear forward or reverse & it immediately stalls - you have a bad torque converter. Start engine, put foot on brake, put car in NEUTRAL, if it DOES NOT stall, but it does stall if you repeat this test when you put car in drive or reverse = bad torque converter - It's called a "stall test"
It depends on the gearing of the car. If you are in the highest gear and 40mph in that gear is under the idle rpm of that car than you will stall.
check the idle speed with the car in gear, if it has a tac on the dash it should idle in gear at about 700 rpm if its too low the car will vibrate or stall.
Its not in reverse gear.
Travelling to slow in a high gear, so clutch in and lower the gear.
I'm no mechanic, BUT that happened on my Taurus when the fuel pump was not functioning properly. Best to take it in.
A car might stall when shifting from park to reverse if the idle is set too low. It is also possible that the engine stalls because it is not fully warmed up before shifting from park to reverse.
Sometimes the torquconverter can fail causing the engin to stall. In reverse it lock in full torqu. In fwd gears it slips. This is only one idea.
because there is no further GEAR in reverse.
the car goes back
Check your transmission fluid level and also if the gear chamber is not well greased then it will make them stick causing the vehicle to stall.