Help...!!! ZF-5HP30 has no reverse.

[CheapCheap1]

Hi Bimmer's Guru,

The odometer on my '95 540i (auto) just hit 87,050 miles - this car is used only on the weekend 80-100 miles/wk.

This morning - Feb/28/2010, it got stucked in the freakin snow & I tried to swing it out for a good 20-30 mins. Finally, I had to asked the local good smaritans to help pushing (backward & forward) it out. Then, after got home, I can't back it up to the park area.

Yes, I did searched the board...
I found some possible causes (why this ZF-5HP30 has no reverse). The 1st one is those poor designed checked balls in the valve body unit. Another one is the reverse plate /or clip.

Anyway, I would like to know:
1) Is there any good reliable transmission repaired shop in NYC area you can recommend? (How about those franchaise, ie: AAMCO, Lee Myles & etc?)
2) How much would the avg. cost to replace the body valve (swaped the old one)?
3) How much would the avg. cost to replace the reverse plate /or clip?

Many thanks,
CC1