B&M makes a trans pac and trans-go makes a shift kit. I used the transpac on my LU 904 and the trans-go on my A500....liked them both.

you'll want to put a stiffer spring in the lockup valvebody to raise the lockup RPM. my stock one wanted to lockup at 1200 RPM. there's a NS1 kit from chrysler that raised it to ~2000 RPM that consisted of a different spring and cover plate for the lockup valvebody.