Hmmm, I wonder if part of your issue might be the manner in which you are engaging P
Once again, siai47 gave an excellent description in this thread:http://myimiev.com/forum/viewtopic.php?f=22&t=1741
To reiterate, one should not let the parking sprag (pawl) hold the car on an incline. For example, on an incline, you DO NOT put the car in P
and take your foot off the brake without having first engaged the hand brake. Doing so will result in a lurch and a thunk as the sprag engages.
The proper way, on even the slightest incline, is to keep foot on brake, shift to P
, pull hand brake, release foot brake. The parking sprag may or may not have engaged, but it is the hand brake that is holding the car in place.
Reversing the process: start car, foot on brake, release hand brake, shift out of P, and only then release foot brake.
If you are in a situation whereby you do not want to leave the car's hand brake engaged (e.g., a wet drive followed by freezing conditions) on an incline, then with foot on brake shift into P and then slowly release the brake so the car rolls slightly and the sprag engages. The steeper the incline, the sharper the clunk and jolt as the sprag engages.