My car is 1990 BMW E34 M20B20 that uses 4HP22 transmission and here is the problem:
When I put it from P into R it makes a sound like a hitting and doesn’t move but you can understand it is on load, because when I step on the gas, engine cannot outrun 2000 rpm (even at trying to rev).
When I shift into N, it starts to move forward and it’s drivable but not an engaged drive, and while traveling or not, when I shift from N into D, it retrieves the engaged drive and goes normal.
I think it cannot leave 1st gear or all forward clutches.
What the problem could be?
Sorry for my English,
And thanks for help all given in advance.