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friend has a reg old civi k30 with 4.56 and 38" swamper tires .
he swapped the 465 4 speed for a nv4500 and he TOTALY loves the new highway cruising ability to and from play days at local clubs and such .
stock th400/208/4.56/235/85/16 tires
@ 70mph is 3571 rpm
@ 60mph is 3060 rpm
@ 35mph is 1785 rpm
tranny swap nv4500/208/4.56/235/85/16 tires
@ 70 mph is 2535 rpm
@ 60mph is 2175 rpm
@ 35mph is 1270 rpm
hope this helps .
and play around with this its GREAT http://www.grimmjeeper.com/gears.html