Pinion angle, modded '68 Mustang - Hot Rod Forum : Hotrodders Bulletin Board -- 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 02-20-2011, 10:33 AM
Registered User
Join Date: Jul 2008
Location: Cambridge, England
Posts: 70
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Pinion angle, modded '68 Mustang

The 393 stroker and T5 in my '68 Mustang are angled down (towards the rear) at 5. This is as high as I can get the tailshaft under the trans tunnel due to the slightly increased height of the T5.
The Currie 9" rear, a new custom rearend, sits on stock Eaton GT springs with no blocks or modifications. The pinion points downwards at -2 towards the front. This is clearly not great, so I tried some wedges under the spring perches to help. I got the pinion up to +4 with some 6 wedges, but they raised the rear too much and it fouled the wheelarches and exhaust on full travel.
So I have a pair of new perches from Currie, and am about to cut off the old ones (one at a time, after some very careful measurements) and weld the new ones on to give me a pinion angle of +4.5, giving a little allowance for torque reaction.
This mod will leave the driveshaft at nearly horizontal, maybe going a little negative when the car is loaded. Anybody see any problems with this - I'd be very grateful for thoughts?
Car is for street use only, no drag racing.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 02-20-2011, 02:24 PM
ericnova72's Avatar
More for Less Racer
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 50
Posts: 13,259
Wiki Edits: 0

Thanks: 140
Thanked 1,761 Times in 1,493 Posts
Only 1/2 for torque reaction in a leaf spring set-up is awful low, I would recommend a 2-2.5 difference because leaf springs naturally have lots of flex. To put it in perspective we run 5-7 in a drag race application.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-20-2011, 04:11 PM
Registered User
Join Date: Jul 2008
Location: Cambridge, England
Posts: 70
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks - but what an idiot, I forgot to mention the Traction-Master bars, which will reduce the torque reaction a bit.
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
pinion angle up or down? db flyer Transmission - Rearend 15 01-15-2011 07:25 AM
Help setting 68 Mustang pinion angle onpyramid Suspension - Brakes - Steering 3 11-05-2009 02:17 PM
So its ok to set pinion angle with.... Hogwild Transmission - Rearend 1 02-25-2008 09:48 PM
Pinion Angle 6.5% JohnTN General Rodding Tech 23 11-15-2006 09:48 AM
pinion angle supernova71 Hotrodders' Lounge 2 05-23-2003 06:05 PM

All times are GMT -6. The time now is 06:45 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 1999 - 2012. All Rights Reserved.