Oldsmobile Diesel Transmission Questions

[ClassicTVMan1981X]

Does anyone know anything regarding the maximum engine input horsepower and torque specifications for the TH200/C, TH200-4R, TH350/C and TH400/C whenever they're used with the Oldsmobile 4.3L V6 (LT6), 4.3L V8 (LF7) or 5.7L V8 (LF9) diesel engines?

The gear ratios are:

TH200/C, TH200-4R
1st: 2.741:1
2nd: 1.568:1
3rd: 1.0:1
4th: 0.674:1 (TH200-4R only)
Reverse: -2.07:1

TH250/C, TH350/C
1st: 2.52:1
2nd: 1.52:1
3rd: 1.0:1
Reverse: -2.07:1

TH400/C, 3L80
1st: 2.48:1
2nd: 1.48:1
3rd: 1.0:1
Reverse: -2.07:1

It is known that many Oldsmobile diesels were given the TH200/C (direct-drive) transmissions in the early 1980s, which may be perceived as one reason why the Olds diesel was so bad (other than the engine's own issues like head bolts, gaskets, and no fuel/water separator): The metric-specification transmission wasn't exactly designed to handle engines with such immense torque. Now this would've been a better fit with the smaller 4.3 liter diesels (both the V6 and V8 versions), but not the 5.7.

The TH200-4R, by comparison, was a much better transmission partly because of the overdriven 4th. Starting in 1983, it was often specified in place of the TH350 which was also a better transmission for the diesel 5.7 than the TH200/C.

I also wonder whether any of the Oldsmobile diesel engines ever used the TH250/C, dependent on whether or not that transmission was available with the BOP (Buick-Olds-Pontiac) bellhousing?

~Ben