1500HP Engine Pack 1.45
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.