Hey guys new here.

Just picked up a 91 Honda Accord automatic for my girlfriend and problem I am having is reverse does not want to engage if parked on a slope front facing down.
If I am parked level or even with front up on slight hill its fine. I have checked the transmission fluid, it is full.
Sometimes when it shifts gears when its cold it will jerk when engaged. Once warmed up it shifts fine.
I was hoping someone here could give me tips on what to check or what may be causing this issue.
Thank you.

 

Fluid should be at least up halfway through the hash marks on the dipstick(level ground). I live in a hilly area with a few off camber turns, and have found that the transmission shifts much better if I keep the fluid full to the upper part of the hash mark.
I usually check by running the engine, leave it running, place it into every gear to charge up the circuits for a few seconds. Place it back in Park, leave engine running, pull diptstick, wipe clean, reinsert fully, remove diptstick and check ATF level. If it appears to be low, add more fluid, or at least get it as close to the top of the hash mark without overfilling.

I suspect as the transmission gets older, accumulator seals no longer properly hold fluid and allow the circuits to drain down quickly. So although the fluid level may check out 'OK' per Hondas recommendations, it will actually be low on fluid.

Jerky shifts are common on the older 90-92 cars, but it is good to verify that the throttle valve cable on the transmission is properly adjusted. There should be no slack, but there should be no tension in the cable. Transmission lever should only begin to rise when the throttle begins to open. AT cars TB bellcrank has a bit of play before pedal actuation opens the throttle. You want the TV cable to lift when the TB butterfly opens.

Verify that all the gears work fine as well, and none of them are 'soft'(slipping) feeling during normal operation. IIRC 4th gear uses the spur gear to create R.

 

Thank you Mike, I will give this a go first thing in the morning. Appreciate the help.