My understanding is that the 200-4R (not to be confused with the THM 200)
can be built to be very reliable. It was mated to the turbo-V-6. I had one
rebuilt with some H/Duty parts and installed it behind the 400 Pontiac motor
in my '67 GTO. I have put 6000 miles or so on it with no problems. I made my
own TV cable bracket. High Performance Pontiac magazine did a series on the
200-4R. It was titled "I feel the need 4speed" or something like that. I
believe One of the Chevy magazines did one too.
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959