Fuel Capacity and grearing question
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Freshman User
Joined: Jun 2006
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Fuel Capacity and grearing question
What are the quantities of the fuel tanks on an 87 F250 with the 6.9L? I just took a trip and got 266.1 miles out of the rear tank. Sound about right?
Also, I took that trip, essentially unladen, doing 60mph turning 2700rpm on the tach in 4th gear (She's a 4 speed manual tranny). Any ideas for what the gearing is for the 4th gear or the rear end?
Thanks guys!
Also, I took that trip, essentially unladen, doing 60mph turning 2700rpm on the tach in 4th gear (She's a 4 speed manual tranny). Any ideas for what the gearing is for the 4th gear or the rear end?
Thanks guys!
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
I think the tanks are 17 front and 19 rear.
Assuming a tire size of around 31" I'd guess 4.10 gears. High gear in the four speed is 1:1
Assuming a tire size of around 31" I'd guess 4.10 gears. High gear in the four speed is 1:1
Last edited by cookie88; Aug 24, 2006 at 08:56 AM.
Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
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From: Ladner, British Columbia
12-14 mpg sounds about right to me for your set-up without an overdrive.
In comparison I got the ZF5 Overdrive tranny with the 3:55 rear end and do +20 mpg at 60mph, no load with the engine turning about 1900 rpm with 3 psig of turbo boost.
The overdrive trannies have made a significant improvement to fuel economy on these trucks.
Seb....
In comparison I got the ZF5 Overdrive tranny with the 3:55 rear end and do +20 mpg at 60mph, no load with the engine turning about 1900 rpm with 3 psig of turbo boost.
The overdrive trannies have made a significant improvement to fuel economy on these trucks.
Seb....
