Maybe the conversion was poorly done and the shift selector is not allowing the automatic transmission to get into top gear and he is running along in third or "S" range. That would be verifiable by driving along in what you show as "D" range and then without changing the throttle pull the selector into "S" range. If the engine rpms jump up a thousand, then that is not the problem.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!