It could just be a detent, but most likely the bearings are going in the transmission and it's a little mis-aligned when you try to go, pushing it out of gear.
Slipping Through My Fingers was created on 1981-03-16.
The Allison autos don't use a switch for that - it's triggered through the transmission ECU.
You would have to literally run a wire from the battery through a fuse and then to a toggle switch and then on to the backup lights, this will only function when the switch is on and will have nothing to do with the transmission being in reverse. This is essentially the same as putting a toggle switch across the transmission mounted switch (assuming the transmission switch is not shorted).
The fluid will aerate, which will cause slipping, shuddering, etc..
It may mean your transmission is damaged, and is applying too much torque. You may have lost fluid through a crack in the transmission. A qualified transmission mechanic can determine if the transmission needs to be repaired or replaced.
The cast of Slipping Through the Cracks - 2010 includes: Shellee Smith
A reverse osmosis water treatment plant attempts this.
Check the transmission fluid for odd color or smells. If all of the forward gears work ok then the transmission fluid may not be flowing properly through the valves. The filter could be stopped up, or the bands for reverse could be worn.
If your transmission is good then you usually have to pump the clutch a few times and go through all the gears back to reverse til it goes in. I usually go from 4th to reverse then 1st to reverse then 3rd to reverse etc...until it goes in. Hope that helps!
On models with manual transmissions and transmissions such as the Eaton Autoshift, it's directly on top of the housing for the transmission tail shaft. If it has an Allison transmission, it's done through the transmission computer itself.
The transmission doesn't lose power, but it quits getting power if the clutch starts slipping. Without going into detail about the physics of a clutch, the most energy is being transferred through the clutch when in the highest gear thus it is fifth gear where slipping is first noticed. My guess is its time for a new clutch.
On top of the transmission output. The best way to get to them is usually to remove the boot from the transmission shift tower, and go in through the floor.If you have an Allison automatic,, the reverse lamps are controlled through the transmission ECU.