2WD Gears
Thread Starter
|
New User
Joined: Aug 2006
Posts: 9
Likes: 0
2WD Gears
I have a 1985 F150,4.9,manual 4sp w/od Tires are 235/75/15.The truck is completely stock and runs good.I have read all kinds of post about changing rear gears in all kinds of 4x4 trucks and a few about 2wd trucks that have went to bigger tires.I don't want to change tire sizes but my truck is a dog with 2.47:1 gears and I would like to know if someone has a run 3.55 or 3.73 gears in a truck such as mine and if they liked the change.I realize milage may drop but 2.47:1 behind a 4.9 in the hills of West Virginia is not a good setup.
Postmaster
Joined: May 2004
Posts: 2,854
Likes: 0
You needn't be in overdrive while going through the hills. Using third gear is the old high gear in a non-o/d tranny.
If you going fast through the hills though, with 3rd gear, your rpms will be up there.
I have your setup but with a 3.08 axle. I would recommend a higher number axle for your terrain, perhaps a 3.55. My terrain isn't hilly, it's flat to rolling, the 3.08 has no problem.
Your rpms will rise from 1300 to 1850 at 60 mph, but that's still a low rpm level for a pickup at 60 mph. IMO that 2.47 doesn't belong in the Appalachians.
If you going fast through the hills though, with 3rd gear, your rpms will be up there.
I have your setup but with a 3.08 axle. I would recommend a higher number axle for your terrain, perhaps a 3.55. My terrain isn't hilly, it's flat to rolling, the 3.08 has no problem.
Your rpms will rise from 1300 to 1850 at 60 mph, but that's still a low rpm level for a pickup at 60 mph. IMO that 2.47 doesn't belong in the Appalachians.
Thread Starter
|
New User
Joined: Aug 2006
Posts: 9
Likes: 0
Thanks for the reply.I don't think the 2.47 gears belong in any truck! I have to do some Big Road driving(I-64) when I go to work but even at 70 mph if there is any kind of a hill it will loose everything.Its my first experience with the 300 six and I was just wondering if the(free)3.55 r&p that I have was an ok setup and what other peoples experience was with a setup like mine.
Thread Starter
|
New User
Joined: Aug 2006
Posts: 9
Likes: 0
Yes,it seriously has 2.47 gears and they are worthless.I will be putting the 3.55 gears in as soon as it warms up around here.
Trending Topics
Postmaster
Joined: May 2004
Posts: 2,854
Likes: 0
I'm curious how you drive with a 2.47. With my 3.08 I shift into 4th on level terrain at around 45 mph. How about you?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Postmaster
Joined: May 2004
Posts: 2,854
Likes: 0
Interesting. My calculation says you're turning only 1300 rpm at 60 mph. Some of these guys idle faster than that!! If you were on pretty level terrain, you could get some pretty awesome fuel mileage.....until you hit a headwind.
Posting Guru
Joined: Nov 2003
Posts: 1,006
Likes: 4
From: Sussex County, DE
Originally Posted by srercrcr
Interesting. If you were on pretty level terrain, you could get some pretty awesome fuel mileage.....until you hit a headwind.
Thread Starter
|
New User
Joined: Aug 2006
Posts: 9
Likes: 0
Your exactly right Argo! with these gears its doing all it can to hold 70 mph on level ground and if there is a head wind it is better to slow down to about 60 mph and run it in 3rd gear.I would almost think my mileage would improve when I get the 3.55's put in because the motor would'nt be laboring so hard.