I've rebuilt lots of A43D and A340 series trannies, and the only place I'll buy a converter from is Precision of New Hampton.

http://www.gopnh.com/

I've had several shop owners tell me PoNH has good stuff, USA-made, lowest return rate (shop owners HATE doing free warranty reinstalls), great service, and reasonable prices.

Is the fluid burned? If it's high mileage and the TC goes out, I generally overhaul the whole thing.

1986 Sunrader Motorhome 22RE $200
1987 4Runner 22RE (under construction) $80.77
1989 4Runner 22RE, 6" lift, 35" Dunlop mudders $420
All rescued from sitting to death, all auto, 'cuz I'm too dumb to drive a standard.