Limits of the Ford 8" rear - 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
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-08-2008, 01:46 PM
mr.Pinto's Avatar
Ford's answer to tailgaters!
 

Last journal entry: My new project!!
Last photo:
Join Date: Jul 2004
Location: Canada
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Limits of the Ford 8" rear

I need to decide whether or not to get a new gear for my 8", or switch to a 9". I'm looking to go to a 4.30, possibly a 4.56 gear. As of now, I have 3.80's in the 8". I raced it this summer with zero problems with a 350hp or so SBF.

This winter I'm stepping it up a bit in the engine department, so there will be considerably more power. I have been told that the 8" will hold up well under quite a bit of power as long as it's built right, and the gears don't get much higher than 3.80 or 4.11. Anything over that the pinion is really small and won't last long.

So should I get a 9", go to the work of narrowing it, and put in the gears I want? Or press my luck with the 8" and hope for the best?

The car is real light (2550lbs) if that makes a difference.

    Advertisement
__________________
Mr. Pinto
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-08-2008, 03:26 PM
ramzoom's Avatar
Registered User
 
Last photo:
Join Date: Sep 2007
Location: CA
Posts: 113
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I dont think you can get anything past a 4:11 in a 8" rear so you would have to go 9"...Am I right on this guys??
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-08-2008, 03:39 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Pittsburgh, PA
Age: 40
Posts: 5,128
Wiki Edits: 16

Thanks: 0
Thanked 2 Times in 2 Posts
8"s have very limited gearing options.

Make a poor-man's 9". Get the center bowl and carrier from a small 9" and put your 8" tubes on it. That's how Shelby did it for the first mustangs, and it will save you big bucks over buying a complete 9"
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-08-2008, 10:19 PM
prostreet6t9's Avatar
Differential/Driveline
 
Last photo:
Join Date: Sep 2008
Location: oregon
Age: 51
Posts: 1,719
Wiki Edits: 0

Thanks: 5
Thanked 40 Times in 37 Posts
Plenty of ratio's available:
3.00
3.25
3.55
3.80
4.11
4.62
5.43

You might consider selling the 8' while it's in good shape,I see them selling on Ebay for pretty good money, I bet you can get enough money to at least get core 9' housing and get the housing work done with a little left over. I would worry about the 28 spline axles in the 8' if your gonna keep making more power.

Last edited by prostreet6t9; 11-08-2008 at 10:41 PM.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-09-2008, 07:05 AM
Deuce's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Choosing a trailer
Last journal entry: Jan 13 2013
Last photo:
Join Date: Aug 2002
Location: Deuceland USA
Age: 66
Posts: 5,657
Wiki Edits: 6

Thanks: 0
Thanked 9 Times in 9 Posts
Quote:
Originally Posted by mr.Pinto

The car is real light (2550lbs) if that makes a difference.
Weight is a BIG factor in the fact that your 8 inch Ford has lasted as long as it has. My wife says I over do most everything ... But I believe I would go ahead and move up to a 9 inch Ford with 31 spline axles. Most sanctioning bodies want a good axle shaft in a car if you are going reasonably quick. Just go ahead and get the good rear end with good aftermarket axles and be done with it. Peace of mind ... and safety are the benefits
__________________


"I won't be wronged . I won't be insulted, and I won't be laid a hand on. "






Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
8.8 Ford rear end in my 79 G body Malibu 79 Malibu327 Transmission - Rearend 4 05-20-2007 02:26 PM
8" Ford Rear & Brakes GoodWood Transmission - Rearend 2 06-22-2006 03:45 PM
1945 ford p/u rear leafs,to keep or not to keep biglee550 Suspension - Brakes - Steering 8 04-25-2005 07:05 PM
Ford 7.5" Rear End Traction-Loc Install nightrain_rod Transmission - Rearend 2 12-30-2003 06:38 PM
rear differential for 46 ford rp1 Suspension - Brakes - Steering 1 09-08-2003 07:43 AM


All times are GMT -6. The time now is 08:21 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.