Whether you drop in a NV4500 5spd manual transmission or you get a 4L80E with a TCI EZ TCU transmission controller, overdrive is only way to get those rpms low enough for reasonable fuel mileage. ![]() Nothing is going to help that fuel mileage more than overdrive. ![]() ![]() 90 and older is particularly bad and that is largely due to NO OVERDRIVE. Always a big complaint with 454 TBI trucks. Stock TBI 454 makes 230hp and 380tq so stock fuel pump is maxed out right off and a typical 454 will run better with a fuel pump upgrade even with stock chip. So I begin every project with a new upgraded pump. I recommend upgrading to the 1996 Vortec 155lph fuel pump which can support up to 450hp and plugs right into a factory TBI sending unit. However, they can be improved.įirst I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. After messing with my brothers 1992 454 TBI dually truck and now my 1991 TBI 454SS, I am going to say, I am not a big fan of the 91-95 GEN V big block engine. I have made some changes to this page after learning a lot the hard way of course with my 1991 454SS project truck.
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