Offset rearend and pinion angle - 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 02-04-2005, 04:36 PM
murrsue's Avatar
Member
 

Last journal entry: 57 pickup 8.8 rear axle install
Last photo:
Join Date: Dec 2002
Location: Manitoba, Canada
Age: 55
Posts: 211
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Offset rearend and pinion angle

57 chev truck. Volare front IFS.
I'm getting ready to set my motor and tranny in place in my frame in order to position them and make motor and tranny mounts. I put a Ford 8.8 rear in back and it has a 2" center offset toward the pass. side. I'm thinking about moving the motor toward the pass. side as well to avoid too much sideways pinion angle. It looks like the distance from u-joint to u-joint will be about 53 1/2". How much should I move the engine over or will the pinion angle be okay if the motor is centered? Also if I have some side to side pinion angle should I go for 0 vertical pinion angle?

    Advertisement
__________________
murray
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-04-2005, 04:46 PM
bracketeer's Avatar
489 Lemans
 

Last journal entry: Street Legal
Last photo:
Join Date: Dec 2004
Location: Courtenay, BC, CehNehDeh
Age: 55
Posts: 2,139
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
pinion angle

The straighter the vertical the less stress on the drive train. Horizontal angle has to be calculated.
__________________
[URL]http://members.shaw.ca/g.body.building[/URL]
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-04-2005, 04:49 PM
willys36@aol.com's Avatar
Hotrodders.com Moderator
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,376
Wiki Edits: 21

Thanks: 1
Thanked 4 Times in 4 Posts
Re: Offset rearend and pinion angle

Quote:
Originally posted by murrsue
57 chev truck. Volare front IFS.
I'm getting ready to set my motor and tranny in place in my frame in order to position them and make motor and tranny mounts. I put a Ford 8.8 rear in back and it has a 2" center offset toward the pass. side. I'm thinking about moving the motor toward the pass. side as well to avoid too much sideways pinion angle. It looks like the distance from u-joint to u-joint will be about 53 1/2". How much should I move the engine over or will the pinion angle be okay if the motor is centered? Also if I have some side to side pinion angle should I go for 0 vertical pinion angle?
It doesn't matter whether you offset the engine and rear end vertically or horizontally, the shafts must be parallel. Pinion angle alone is meaningless, the important thing is that whatever the tranny output shaft angle is, the pinion must match it in the same plane. The cartoon below can be viewed as looking at the drive line from the top, side or any other angle, the principle is the same. The first and second drawings show the acceptable configurations. Both are just fine. The latter two are BIG NO-NOs!!

Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-04-2005, 06:07 PM
cboy's Avatar
Member
 

Last journal entry: Finished
Last photo:
Join Date: Jan 2004
Location: Atwater, CA
Age: 69
Posts: 3,914
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
You really don't need to offset the engine/trans at all. A 2" offset over 53" of length is not that wild - especially if you are not going to be racing. When I put a 307 Olds in an RX-7 some years ago, my rear end guy told me that it was actually advantageous to keep an inch or two of offset in the setup.
__________________
Always learning...and sharing what I've learned. The Scratch-Built Hot Rod.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-04-2005, 06:34 PM
murrsue's Avatar
Member
 

Last journal entry: 57 pickup 8.8 rear axle install
Last photo:
Join Date: Dec 2002
Location: Manitoba, Canada
Age: 55
Posts: 211
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks guys. I knew that the intersecting lines had to be parallel. I was worried that some moderate strain from sideways pinion angle + some strain from some up and down pinion angle might = too much strain. I'll probably offset the motor 1/2"-1" to give me some clearance from the steering box and try for as little up and down pinion angle as possible.
__________________
murray
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 05-19-2007, 05:51 PM
ajbcc2's Avatar
Registered User
 

Last journal entry: frankenstude too
Last photo:
Join Date: Oct 2006
Location: Ma.
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Offset rearend and pinion angle

my setup has the old drag bars..with the rubber bumper on the top of them facing the spring. I assume these are supposed to prevent the spring from wrapping in the upward direction on acceleration?...but then i read to have the 3-5 deg upward pinion position at home position because of downward drive at acceleration?..?..what gives? does a ford 9" tend to go up or down when you hit it?
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



All times are GMT -6. The time now is 09:14 AM.


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.