66 Ford Mustang rear end gears - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 11-18-2002, 02:27 PM
Join Date: Oct 2002
Location: Northern California
Posts: 53
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Question 66 Ford Mustang rear end gears

Is anyone familiar what gear size came stock in the '66 Mustang Coupe? I'm in the process of planning out a restomod kinda thing, and what I'm aiming for is something very streetable, but with really good low end torque. I want to be able to race (street only, perhaps 1 city block in distance) but not completely toss fuel economy out the window.

Any recommendations? I think its an 8" rear end, though I am not too familiar with cars yet (am learning).

[ November 18, 2002: Message edited by: 66StangBoy ]</p>

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 11-18-2002, 03:11 PM
BOBCRMAN@aol.com's Avatar
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,970
Wiki Edits: 0

Thanks: 85
Thanked 520 Times in 458 Posts

unless it was originally a six cylinder with 4 bolt lugs it is probably an eight inch, gears are available for it but posi units are very rare.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-18-2002, 04:00 PM
Join Date: Oct 2002
Location: Northern California
Posts: 53
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts

Would an upgrade to a bigger rearend give more parts availability? What kind of added weight would increasing the rearend add?

I think I read somewhere that they originally came with 3.00" gears. Should I try and switch those out with something bigger? 3.5"?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-18-2002, 06:22 PM
dmorris1200's Avatar
doesn't play well with others
Last photo:
Join Date: Feb 2002
Location: Maine
Age: 51
Posts: 1,834
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post

If you are interested send me a PM with your e-mail address and I can e-mail you info I have on rear axle codes, trans codes, paint codes, and stuff. There were actually many different axle ratios available in '66. The most common was probably the 3.00. <a href="http://www.ridgenet.net/~biesiade/Fordrears.html" target="_blank">Click here</a> for a link for 8-inch or 9-inch question. The site gives gear ratios by ID tag on rear. The paper I have gives it by vin breakdown. 3.00 is basically economy highway gears. If you want a little extra kick without overdueing it 3.50 would be pretty good without an overdrive trans. I have 3.70's in mine and she revs pretty high on the interstates (I also have stock diameter tires which makes a difference). I also switched to a 9-inch rear due to the lack of available parts for the 8-inch. Gears is something you'll have to decide on based on what you really want out of your car. Mine does mostly local and back road cruising so I don't mind the higher rpm's that much, but if I was doing a lot of highway driving or long trips I would probably prefer between 3.25 and 3.50 with my stock tires. But if you're looking to rip from light to light and limited highway use I think 3.70's make a nice choice.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may 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

All times are GMT -6. The time now is 10:23 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.