trailing arm on 86 trans am rearend - 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> Suspension - Brakes - Steering
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-14-2011, 12:39 PM
ogre's Avatar
the 'Duracell Project'
 
Last photo:
Join Date: Nov 2009
Location: Motown
Posts: 1,372
Wiki Edits: 0

Thanks: 0
Thanked 92 Times in 85 Posts
trailing arm on 86 trans am rearend

my 58 chevy truck has an 86 trans am rear end in it.
the truck is lowered by flipping the axle and a 3'' c-notch in the frame.
when i take of under hard acceleration the drive shaft rubs a xmember.

i believe this is due to spring wrap under 1st gear acceleration, tilting the pumpkin.
the trans am was set up with coil springs, panhard bar and a single trailing arm running to the side of the back of the trans.
i'm thinking of leaving my set up as is and adding a trailing arm to prevent spring wrap and thus prevent the tilting of the rearend.

my question is: how far up should i make the trailing arm pivot?
option 1. front pin of the rear leaf springs. this is the natural pivot point of the rearend anyways. this point is also the xmember that rubs.
option 2. as far towards the back of the trans as i can get it. i'm thinking there will be some binding between the pivot of the leaf springs in suspension travel with having the pivot up front.

also should i use a link (like a sway bay link) or a pivot (like a rubber a-arm pivot)

this picture shows the rearend setup as is. the bed is on and the truck is driven daily.
you can also see the bolt holes for the swing arm mount on the front of the pumpkin.



the drive shaft is hitting the 2nd (painted) xmember, no real room to move it up or modify it.


    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-14-2011, 12:43 PM
ogre's Avatar
the 'Duracell Project'
 
Last photo:
Join Date: Nov 2009
Location: Motown
Posts: 1,372
Wiki Edits: 0

Thanks: 0
Thanked 92 Times in 85 Posts
with the bed on i have minimal suspension travel, maybe 2.5''.
i had to add air shocks to keep off the bump stops.
yes i should redo the whole rear setup, but 3400 miles on the power tour
proved the air shocks are effective at keeping me off the bump stops
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-16-2011, 11:22 AM
ogre's Avatar
the 'Duracell Project'
 
Last photo:
Join Date: Nov 2009
Location: Motown
Posts: 1,372
Wiki Edits: 0

Thanks: 0
Thanked 92 Times in 85 Posts
anybody?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-16-2011, 12:49 PM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: España Right Coast
Age: 63
Posts: 3,242
Wiki Edits: 0

Thanks: 86
Thanked 71 Times in 68 Posts
I´d go look at the stock setup on an 82 - 92 Trans Am or Camaro.
The swinging arm you speak of is in fact a torque arm anchored at the trans tailshaft in a rubber bushing.There were two trailing arms each side of the axle.

Would´nt your setup be better with traction bars, Cal-Tracs for example ?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-16-2011, 12:51 PM
OneMoreTime's Avatar
Hotrodders.com moderator
 
Last wiki edit: Health and safety in the shop or garage
Last journal entry: Yard Dog pic
Last photo:
Join Date: Jul 2004
Location: Washington State
Age: 69
Posts: 7,226
Wiki Edits: 3

Thanks: 38
Thanked 126 Times in 122 Posts
H'mmmm I am thinking...

Sam
__________________
I have tried most all of it and now do what is known to work..
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-16-2011, 04:34 PM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
How did you route the Vent and what about the Gear lube level with the Housing flipped?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-17-2011, 08:56 AM
ogre's Avatar
the 'Duracell Project'
 
Last photo:
Join Date: Nov 2009
Location: Motown
Posts: 1,372
Wiki Edits: 0

Thanks: 0
Thanked 92 Times in 85 Posts
malc: yes, i am referring to the torque arm not trailing arms. i figure traction bars would look silly on this truck. i also figure that i have the mount on the housing, i should use it. plus i have all the materials to build it on hand.

onemoretime: think harder.

sedan: i flipped the axle on top of the springs, same orientation. flipping the axle as you suggest would give me 4 speeds in reverse only.

looking at traction bar mounts; i will pivot at the front pin of the rear springs.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-17-2011, 10:09 AM
cal1320's Avatar
Registered User
 
Last photo:
Join Date: Dec 2010
Location: central FL
Posts: 256
Wiki Edits: 0

Thanks: 0
Thanked 14 Times in 13 Posts
I would try to use the factory torque arm if possible. It bolts neatly to the axle and works great. If you think you need more strength you can box the torque arm. Makes it VERY strong. Up front you cannot bolt it rigidly to the x member or the suspension will bind. Arc of the springs vs arc of the torque arm. Build a shackle mount like the pic. It will allow free movement of the axle.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 06-17-2011, 10:58 AM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: España Right Coast
Age: 63
Posts: 3,242
Wiki Edits: 0

Thanks: 86
Thanked 71 Times in 68 Posts
Quote:
Originally Posted by ogre
looking at traction bar mounts; i will pivot at the front pin of the rear springs.
I think you need it longer, at least to the trans tail shaft like the original.
You need the axle to be going up and down a short "torque arm" will cause it to arc.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 06-17-2011, 11:16 AM
cal1320's Avatar
Registered User
 
Last photo:
Join Date: Dec 2010
Location: central FL
Posts: 256
Wiki Edits: 0

Thanks: 0
Thanked 14 Times in 13 Posts
One other note. I would also use a heim joint at the x member shackle to arm connection. This will allow for any roll rotation without binding.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 06-17-2011, 11:22 AM
OneMoreTime's Avatar
Hotrodders.com moderator
 
Last wiki edit: Health and safety in the shop or garage
Last journal entry: Yard Dog pic
Last photo:
Join Date: Jul 2004
Location: Washington State
Age: 69
Posts: 7,226
Wiki Edits: 3

Thanks: 38
Thanked 126 Times in 122 Posts
Quote:
Originally Posted by cal1320
I would try to use the factory torque arm if possible. It bolts neatly to the axle and works great. If you think you need more strength you can box the torque arm. Makes it VERY strong. Up front you cannot bolt it rigidly to the x member or the suspension will bind. Arc of the springs vs arc of the torque arm. Build a shackle mount like the pic. It will allow free movement of the axle.
That setup works wonderful and make the length of the arm so the front pivot is about at the front u-joint...and use the shackle with jonny joints or heim to allow for rotation of the rear end..

Sam
__________________
I have tried most all of it and now do what is known to work..
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering 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
trailing arms on a 67 fbody freeskier Suspension - Brakes - Steering 2 02-10-2011 05:56 PM
Help needed for trailing arm application renfroe453 Suspension - Brakes - Steering 2 03-15-2009 01:48 PM
53 ford Trans & rearend Rob Graham Transmission - Rearend 3 07-22-2004 03:38 AM
How do I line up the trans to the rearend? wedamman Transmission - Rearend 2 09-07-2003 06:05 AM
73 duster trans and rearend... purplePeopLEater Transmission - Rearend 1 09-19-2002 12:01 PM


All times are GMT -6. The time now is 01:53 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.