The Ford Barn - View Single Post

kiwitony · 08-09-2011, 03:56 AM

Hi Guys,I'm currently using my 37 pickup for daily commute of 50 miles round trip,I enjoy using the old truck but the gas bill is horrible.I'm running a 4.11 diff with 5 speed.I have a 3.78 converted to open drive in bits but need to get a driveshaft made up.Will changing to this bring my mpg down enough to consider feasable considering cost of setting it up and the new shaft? The trip is a 50/50 split between town and open road.I'm also using a 390 cfm holley with 50s main jets, should I go down a size or two?Thanks in advance Tony.

08-09-2011, 03:56 AM	#1
kiwitony Senior Member Join Date: Aug 2010 Location: Whangaparaoa New Zealand Posts: 263	higer ratio diff Hi Guys,I'm currently using my 37 pickup for daily commute of 50 miles round trip,I enjoy using the old truck but the gas bill is horrible.I'm running a 4.11 diff with 5 speed.I have a 3.78 converted to open drive in bits but need to get a driveshaft made up.Will changing to this bring my mpg down enough to consider feasable considering cost of setting it up and the new shaft? The trip is a 50/50 split between town and open road.I'm also using a 390 cfm holley with 50s main jets, should I go down a size or two?Thanks in advance Tony.