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The TH-180 Opel automatics were built in Strasbourg Germany. They were also installed behind 180 hp 6-cylinder engines, so they're pretty tough.

However, why not just use the TH-700R4 4-speed auto with your 3.4 conversion? You get the benefit of a lower 1st gear (3.06) and an overdrive of .70. So you can run a numerically higher rear axle ratio to improve acceleration, but have the OD for better highway cruising and top speed. With a 4.10 rear axle ratio, you'd still have a 2.87 final drive!

The 700-R4 is only 4 inches longer than the TH-180, and uses the same output shaft, so it shouldn't be too much work to fit.
 
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