What gear ratio? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 01-27-02, 03:30 PM Thread Starter
Vintage Mustang Member
Join Date: Sep 2001
Age: 30
Posts: 26
What gear ratio?

I have a 67 and i want some low end gears for my 9" rear end. I want to be able to go faster off the line but still be able to go 70 on the interstate. I was thinking a 3.7 ratio but i have no idea. I will drag race the car at the local track for fun on weekends but its still going to be a daily driver so would this be a good choice? I was also looking at getting posi traction too. I wanted to put the gears in first and save to get the posi later so can i put the low gear into the posi when i get it or not? My car doesnt spin the tires which bothers me and i suspected it was the gears. I have a 3 speed automatic which doesnt help but i want it to jump off the line as fast as possible. What ratio do you recomend for what i want? What is the stock ratio? The lower the number the faster it will go off the line right? Thanks for the help!
baseball4lf8 is offline  
Sponsored Links
post #2 of 3 (permalink) Old 01-27-02, 06:31 PM
F-150 Member
Join Date: Nov 2001
Location: Florida
Age: 68
Posts: 141
I think that 3.70 is OK. But, you will probably find that the 3.50 are more of a good for everything ratio. I run 3.50 in my 68 FB and they work good. I can still cruise on the highway. But, you'll be turning 3000 rpm at 65 mph. Up or down alittle depending on tire size.

Last year I removed the C-4 and installed an AOD transmission. What a difference on the cruise rpm now. I did change the convertor to an Art Carr convertor without lock-up. The O/D pulls the rpm down about 1000 rpm at cruise.

2005 F150 SuperCrew "King Ranch"
2004 Thunderbird
1997 Ranger
1986 LTD II
1968 Cougar
1964 Corvair Monza
Gearhead99 is offline  
post #3 of 3 (permalink) Old 01-28-02, 11:02 AM
Posts: n/a
I got 3.89s in my car and they are just too much. Without slicks on the car you cannot take advantage of it! I can turn my car sideways at the track with my open 9" if I hit 2nd gear with full power. The 389s with 245/60/14s are 4000 rpms at 80 mph. I am going to go back in and put 3.55s in. It just is too much advantage for street tires.
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Trans | Driveline
Gear in this thread - Powered by O'Reilly Auto Parts

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
1995 gear ratio Armadillo Trans | Driveline 26 10-12-03 10:40 PM
first gear ratio yldsix Trans | Driveline 1 05-25-03 07:09 PM
Ford lays out future automatic transmission plans RPO83 Trans | Driveline 0 11-07-02 11:59 PM
Torque and Horsepower 211 General Tech 9 06-21-02 05:23 AM
Gear ratio question olympic Trans | Driveline 6 08-02-01 11:27 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome