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Help- quick general questions f150

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Old Nov 13, 2005 | 08:51 PM
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Help- quick general questions f150

1991 f150, 2wd.4.9L 300CI I6. Manual.54k miles.

My tranny is (1,2,3,4,OD) Is that a 5 speed?

How do a determine the gear ratio on my truck?
 
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Old Nov 13, 2005 | 09:53 PM
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There should be a coded tg on the dif cover that should have it on it.

The tranny is considered an over drive not a 5 speed although everyone refers to them as 5 speeds. A true 5 speed would only have a final drive ratio od 1:1

it will be #: ## like 4:11 or 3:55
 

Last edited by alabamabuddog; Nov 13, 2005 at 09:56 PM.
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Old Nov 14, 2005 | 04:41 PM
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OK i found it, code 18, for 3:08.

Now, what does having this axle do in terms of fuel economy?The trucks got a 5spd, 4.9 I6, 54,000 miles, kept up regularly. Its got the 3.08. What kind of fuel economy should I expect?
 
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Old Nov 14, 2005 | 05:41 PM
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That is probably the best combo for fuel economy you can get. I would say 13-15 city and 16-18 highway on that?
 
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Old Nov 14, 2005 | 07:48 PM
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Sounds ok, i was hoping for 18-20 highway. On my last tank of gas, i averaged 10mpg, because my driving consists of a 5 minute warmup in early freezing morning and then driving 1.5 miles in tight traffic, intersections. My guess is it would be ALOT better on the highway on a long trip.
 
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Old Nov 14, 2005 | 08:31 PM
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I'd say dale is pretty much dead on. You are driving a giant brick down the road. You're not gonna get 20's in the MPG's unless you have a 50 MPH tail wind going down hill. Just aint gonna happen my friend. Sounds like you got yourself a nice setup otherwise. That ol 300 should last for at least 200K miles more.
 
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Old Nov 14, 2005 | 08:37 PM
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Originally Posted by dale gribble
I would say 13-15 city and 16-18 highway on that?
i have the 4.9, 3.08 gears but an auto with overdrive and that is the mileage i have been getting taking it easy most of the time.
 
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Old Nov 15, 2005 | 12:07 AM
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Originally Posted by handyman43358
I'd say dale is pretty much dead on. You are driving a giant brick down the road. You're not gonna get 20's in the MPG's unless you have a 50 MPH tail wind going down hill. Just aint gonna happen my friend. Sounds like you got yourself a nice setup otherwise. That ol 300 should last for at least 200K miles more.
I get 18-20mpg highway, 1996 F150 4x2 M5OD, 2.73 axle and 31" tires. Of course it doesn't exactly get up to speed quickly. It is at about 1700RPM @ 70MPH. Never usually rev it past 2000.
 
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Old Nov 15, 2005 | 04:42 PM
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Yeah, see im doing 2000+rpm at 65. I dont know what to expect, but not 10mpg.
 
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Old Nov 15, 2005 | 06:49 PM
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My 95 with the 351 and auto gets 14-15 MPG no matter where I go. I have the 3.55 rear and 31 inch tires. At 65 MPH I'm pulling 1800 RPM's.
 
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Old Nov 15, 2005 | 07:19 PM
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I say 2000+ but im not sure. I just keep it below 65 onthe highway.
 
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Old Nov 15, 2005 | 10:29 PM
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i do 2500rpm @ 65mph & 2000rpm @ 55mph w/ my 3.55 rear 5sp
 
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Old Nov 18, 2005 | 06:10 PM
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Ok, folks, checked it again and I'm getting 14.86mpg, about 95% highway. 3 minute warmup time in th morning, running in freezing weather, only for 1.5 miles in and out of tight traffic.Cold engine. Im happy!
 
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Old Nov 18, 2005 | 06:14 PM
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I get about 16 on the highway in my 1991, but it has a 3.55 rear end.

I had a 1990 F-150 (see gallery) that had a 3.08 gear, 2wd, 4.9L, and five speed and I got 19-20 on the highway. I was pretty happy with that.

A transmission is a 5 speed if it has five forward gears, regardless of whether the final gear is overdrive or direct drive.
 
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Old Nov 18, 2005 | 06:31 PM
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Being the nature of my driving, what do you think of my fuel economy?
 
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