340 Build Advice

I have an a999 from a 1989 318 dodge truck. They can be converted to non lockup by swapping the input shaft (maybe some other parts involved, I'll have to research it again before I go through mine to confirm, @#!% Covid Fog!), but you can also have a custom performance converter built without the lockup clutch assembly installed in it. The same gear sets and five disc clutch front clutch drums are in a999 500, 42RH and 42RE transmissions, and I have heard there were some 360 a 998s in the seventies with 5 drum clutches.
Here's some information from Wikipedia, FWIW. I'm sure there are probably exceptions to what's listed here, but this should hit the high spots.
A998 (31RH)[edit]
The A998, later renamed 31RH was a medium-duty, narrow or wide-ratio version of the small-frame A904 transmission for use with medium-power V8 engines and the 3.9 L V6 engine. It was equipped with four direct friction plates. This transmission differed from the A904 by having a reinforced case and internals. Narrow ratios are 2.45/1.45/1.00:1 and wide ratios are 2.74/1.55/1.00:1.

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A999 (32RH)[edit]
The A999 (later renamed 32RH) was a heavier-duty, wide-ratio version of the small-frame A904 transmission for use with medium-power V8 engines and the 3.9 L V6 engine. It was equipped with five direct friction plates. These automatics had lower first and second gear ratios to allow the lower-powered engines to provide better acceleration without sacrificing highway fuel economy. Frequently used today in drag racing.

Uses: