Search



Go Back   MustangForums.com > Ford Mustang Tech > Classic Mustangs (Tech)
Sign in using an external account
Register Forgot Password?
Search

Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 05-13-2013, 10:14 AM   #1
Greg West

 
Join Date: Mar 2013
Posts: 10
Default What gears should I get for my 68 mustang

I have a 68 coupe with a 302. Looking to upgrade to a traction loc differential. I am not sure what gear ratio I have, and not sure what would suite the car and my driving needs best.

I have a stock 302 with an 8" rear end. I have installed a line lock as well as I had to get some brake work done when I first got the car. I am wanting to have power at the lower end, but will be doing highway speeds a fair bit as well. What does everyone suggest?

Any suggestions would be appreciated.

Greg West
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
Greg West is offline   Reply With Quote
Old 05-13-2013, 10:16 AM   #2
rmodel65
Yukon Cornelius
 
rmodel65's Avatar
 
Join Date: Oct 2005
Vehicle: 1965, ford, mustang fastback
Location: deep in the heart of dixie GEORGIA
Posts: 11,624
Send a message via AIM to rmodel65 Send a message via MSN to rmodel65 Send a message via Yahoo to rmodel65
Default

i think i would go with some 355s or 3.73s in the rear
rmodel65 is offline   Reply With Quote
Old 05-13-2013, 10:48 AM   #3
Iskwezm
4th Gear Member
 
Join Date: Feb 2006
Vehicle: 1965 Mustang Fastback
Location: So. Cal,the O.C.
Posts: 1,530
Send a message via Yahoo to Iskwezm
Default

nobody makes a 3.73 for a 8" so the next one up is a 3.80, but most people do not like them on the freeway with a c-4.
__________________
Sound Desicion Car Audio & Perf.
TMI Products.
Ford Cert./ASE Master Tech

2006 Mustang Gt 'Vert-12 sec. daily driver-sold
2006 F250 PSD,9"lift,37's on 20's,King coilovers,air ride,Gearheads 120hp tune,Phoenix Gold 6600 watts,4 12's
1965 FASTBACK-Modified Mustang 2012 cover
http://www.mustangandfords.com/featu...own/index.html
Iskwezm is offline   Reply With Quote
Old 05-13-2013, 11:06 AM   #4
Greg West

 
Join Date: Mar 2013
Posts: 10
Default

Quote:
Originally Posted by Iskwezm View Post
nobody makes a 3.73 for a 8" so the next one up is a 3.80, but most people do not like them on the freeway with a c-4.
I was considering the 3.25 or the 3.55, but don't know what sort of difference it would make, nor am I sure what I have currently. I am going to have to jack it up and spin the drive shaft to see. I also will have to check what the tire size is as well. It is loud as is, and with a wife and 2 kids who like to go on road trips in the car I don't want to be needing ear plugs on a 2 hour drive. Most driving would be shorter trips though.
Greg West is offline   Reply With Quote
Old 05-13-2013, 11:33 AM   #5
Waffles
5th Gear Member
 
Waffles's Avatar
 
Join Date: Jul 2007
Vehicle: 1970 Mustang Fastback
Location: Detroit; where the weak are killed and eaten.
Posts: 2,551
Send a message via AIM to Waffles
Default

Go 3.55. Quick enough, but won't be screaming on the e-way
__________________
Eric- Sales at Brighton Ford.
http://www.facebook.com/sk1nw4lk3r

Waffles is offline   Reply With Quote
Old 05-13-2013, 12:24 PM   #6
Iskwezm
4th Gear Member
 
Join Date: Feb 2006
Vehicle: 1965 Mustang Fastback
Location: So. Cal,the O.C.
Posts: 1,530
Send a message via Yahoo to Iskwezm
Default

You either have a 2.80 or a 3.00. A 3.55 is the best choice.You probably wont notice much of improvement with a 3.25. A 3.80 with a 25" tall tire will be very close to 3,000 rpm at about 70 ish on the highway.
__________________
Sound Desicion Car Audio & Perf.
TMI Products.
Ford Cert./ASE Master Tech

2006 Mustang Gt 'Vert-12 sec. daily driver-sold
2006 F250 PSD,9"lift,37's on 20's,King coilovers,air ride,Gearheads 120hp tune,Phoenix Gold 6600 watts,4 12's
1965 FASTBACK-Modified Mustang 2012 cover
http://www.mustangandfords.com/featu...own/index.html
Iskwezm is offline   Reply With Quote
Old 05-14-2013, 08:27 PM   #7
67mustang302
6th Gear Member
 
Join Date: Apr 2007
Vehicle: 67 Mustang Coupe
Location: California
Posts: 10,330
Default

What do you want out of the car? Different gears for different applications.
__________________
Who cares how much horsepower it has, all that matters is how fast it goes!

Untested 331, lots of suspension, chewing up corners.
67mustang302 is offline   Reply With Quote
Old 05-15-2013, 01:17 PM   #8
palerider
3rd Gear Member

 
Join Date: Feb 2006
Posts: 984
Default

I went with 3.44s. On basically stock 302 I did not notice that much difference and was a little dissapointed. Now that I'm running my 347 glad I went with these gears plenty good down low and not screaming on highway. If you plan on staying close to stock I would go with 3.55 - anything taller will be reving high on +60 cruising.
palerider is offline   Reply With Quote
Old 05-17-2013, 12:47 AM   #9
frdnut
2nd Gear Member
 
frdnut's Avatar
 
Join Date: Nov 2010
Vehicle: 68 mustang
Location: Ontario
Posts: 493
Default

What transmission are you running? An automatic will have a little slippage compared to a manual trans and will add a few more rpms to the tach on the highway.Tire size (diameter) will play into it as well. I would try to figure out what is the max rpm you can live with on the hwy and then do the math to figure out what gears will work for you.There are lots of online rpm calculators that can help you with this...The ultimate setup is an overdrive trans that will allow you to run a low rear end ratio for great acceleration and an overdrive gear for low highway rpms..For example my brother changed out his close ratio toploader 4 speed trans and a 3:1 rear end gear for a T-5 and a 4:11 rear gear..The car is much much quicker now yet runs the exact same rpms on the highway.
__________________

68 J code 408W topoader with 4:11 detroit locker 11.59 @120.95
frdnut is offline   Reply With Quote
Old 05-17-2013, 01:19 PM   #10
jspagna1
3rd Gear Member

 
jspagna1's Avatar
 
Join Date: Jan 2007
Vehicle: 1966 Ford Mustang
Location: CT
Posts: 936
Default

I have a C-4 in my 66 with an 8" and I went with 3:55 and it works out perfect. I don't do a lot of highway driving so if you think you will be I would go with the 3:25.
__________________
1966 Mustang Coupe
Ford Racing 5.0 HO Motor/B303 cam/1.7 RR
TFS TW Heads/Edelbrock Perfor RPM/Holley 650 DP
Mallory Dist/MSD Blaster/Holley Electric Fuel Pump
2.5" Exh H pipe/Flowmasters 40's/Dr.Gas Tailpipes
Lakewood T/A Bars/Aluminum Drive Shaft + loop
Auburn 3.55's/SSBC disc's/C-4 wTCI 2800 stall
Fiberglass hood/trunk/bumpers!(100% Sicilian)
http://www.cardomain.com/ride/2576315/1966-ford-mustang
jspagna1 is offline   Reply With Quote
Old 05-17-2013, 01:19 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 06:02 AM.

© Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup