gear ratio
Thread Starter
|
Senior User
Joined: Dec 2003
Posts: 101
Likes: 0
From: Butler
gear ratio
I have a 1977 F150 with a 351m in it. I was wondering if some one knew what rearend gears I might have.It has a ton of power and torque but no speed.If you take your foot off the gas it will actually lose speed.It is also an automatic.
Elder User
Joined: Jun 2003
Posts: 886
Likes: 1
From: Houston/Hope BC
If the tag is gone, jack up the back under the diff. Get some one to help you turn both tires one full revolution as simultaneously as possible in the same direction (assuming an open diff). Count turns on the driveshaft. Cheers. I bet $1.00 on 3.25. 
Last edited by Ecuri; Apr 24, 2004 at 02:54 PM.
Senior User
Joined: Mar 2004
Posts: 138
Likes: 0
From: Mission BC
Trending Topics
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
I'll have to take your $10 Supercab. A F150 would have a 9" and 3.54's weren't available in a 9". You could get 2.75, 3.00,3.25,3.50,3.70,4.10.
I'll take cash please.
On a 2wd, 3.00 is pretty standard from what I have seen. Depending on what size tires that it has on it, it could be 3.25 or 3.50.
My 351M/C6 truck that is now 460 powered had a 2.75 originally. I put a 3.50LS out of a 86 4x4 Bronco in it.
I'll take cash please.
On a 2wd, 3.00 is pretty standard from what I have seen. Depending on what size tires that it has on it, it could be 3.25 or 3.50.
My 351M/C6 truck that is now 460 powered had a 2.75 originally. I put a 3.50LS out of a 86 4x4 Bronco in it.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Junior User
Joined: Nov 2001
Posts: 57
Likes: 0
From: Renton USA
I would guess 4.10's. The higher numerical gear ratio's (3.70, 4.10 etc.) tend to give more decompression related slowing when you let off of accelerator pedal as to the lower numerical gear ratio's (2.70, 3.00, etc.) which tend to let you coast longer. Sorry, no money, cann't afford to lose any. Bank acount like a sieve. 
Are we talking 4x4 0r 2wd?