Re: I have to park uphill... help!
I'm guessing it's an automatic.
I'd get a transmission flush. If there are any particulates in the valve body it'll affect shifting as it blocks fluid flow. Another case would be to make sure that the linkage is properly adjusted. If you change gears quite a bit with the auto, the linkage will loosen a bit over time.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!