Posted by mannyc [96.224.210.179] on Wednesday, November 11, 2015 at 10:21:36 :
In Reply to: Dennan Overdrive posted by Matt Wilson [71.170.106.218] on Wednesday, November 11, 2015 at 01:03:26 :
unless you have an upgraded engine, i think 489s and an overdrive will make it hard to move your truck along. i may have missed your point and you are talking about putting in 583 and then an overdrive. usually two gearing changes - tires and higher gears, tires and overdrive, overdrive and gears are too much for the flat head
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