rear shackle angle - FSB Forums
Register Home Forums Active Topics Photo Gallery All Albums Mark Forums Read Auto EscrowInsurance FSB Store
FullsizeBronco.com is the premier Ford Bronco Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 02-04-2013, 05:36 PM   #1
m-unit
Registered User
 
Join Date: Jan 2008
Location: Southern Ca
Posts: 181
iTrader: (1)
Bronco Info: 1990 5.8 e4OD, 2wd, 5in" lift, 33's
rear shackle angle

please advise on my shackle angle. This is with full weight of vehicle on the truck...


I have 4-5" lift springs in the front (deaver maybe) and hefty's 2.5" shackle flip in the rear as well as an add-a-leaf.

I'm thinking of getting a longer shackle from hefty to add some height. Perhaps that will help?

opinions
m-unit is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-04-2013, 05:59 PM   #2
Steve83
Registered User
 
Steve83's Avatar
 
Join Date: Jul 2003
Location: Memphis, TN
Posts: 36,174
iTrader: (101)
Bronco Info: '83 VIN & title on '93 frame/body w/'95 4.9L & EB paint
These are the primary considerations for shackle angle:
1) at normal ride height, the line between its bolts should be roughly perpendicular to the line between the leaf spring eye bolts.
2) at either extreme of the suspension travel, those 2 lines should not approach parallel.
__________________
Walk softly & carry a BIG SIX ! ! !

. .
Steve83 is offline   Reply With Quote
Old 02-04-2013, 06:51 PM   #3
JBfab
Registered User
 
JBfab's Avatar
 
Join Date: Oct 2010
Location: Slatington, PA
Posts: 2,429
iTrader: (9)
Bronco Info: 94 C150 prerunner 351/zf/maf. To many mods to list.
Why is your second leaf shorter then the third? Angle doesnt look bad.
__________________
It's not custom if you bought it from a catalog!
Visit my build thread- http://www.fullsizebronco.com/forum/...d.php?t=211825
JBfab is offline   Reply With Quote
Old 02-04-2013, 07:10 PM   #4
m-unit
Registered User
 
Join Date: Jan 2008
Location: Southern Ca
Posts: 181
iTrader: (1)
Bronco Info: 1990 5.8 e4OD, 2wd, 5in" lift, 33's
Quote:
Originally Posted by Steve83 View Post
These are the primary considerations for shackle angle:
1) at normal ride height, the line between its bolts should be roughly perpendicular to the line between the leaf spring eye bolts.
2) at either extreme of the suspension travel, those 2 lines should not approach parallel.
gotcha. I'll check it out when it's flexed to see what's going on as it cycles.
m-unit is offline   Reply With Quote
Old 02-04-2013, 07:34 PM   #5
BRONCONUT
Local # 40 Boilermakers
 
BRONCONUT's Avatar
 
Join Date: May 2007
Location: Hartford, KY
Posts: 14,498
iTrader: (23)
Bronco Info: back in the bronco hut being raped by my wrenches and welder
The angle is bad, you need to shoot for about a 30* angle on the shackle. Looks like you need to move your front hanger back a bout 1-1.5" to get it right. Where you are now you are pretty much depending on the springs to do all of your movement wich means you are within inches of max down travel. If you move the front hanger back some it will also help recenter the wheel in the wheel well. I did this exact tsame thing along with a 1" inch zero rate.
__________________
Vote FSB Or Die



My Stupidmotors
BRONCONUT is offline   Reply With Quote
Old 02-04-2013, 07:54 PM   #6
BRONCONUT
Local # 40 Boilermakers
 
BRONCONUT's Avatar
 
Join Date: May 2007
Location: Hartford, KY
Posts: 14,498
iTrader: (23)
Bronco Info: back in the bronco hut being raped by my wrenches and welder
Here is a pic of a good shackle angle

__________________
Vote FSB Or Die



My Stupidmotors
BRONCONUT is offline   Reply With Quote
Old 02-04-2013, 09:24 PM   #7
m-unit
Registered User
 
Join Date: Jan 2008
Location: Southern Ca
Posts: 181
iTrader: (1)
Bronco Info: 1990 5.8 e4OD, 2wd, 5in" lift, 33's
I've read about moving the front hanger back. Always something to do with this thing...

I need to move my pass side radius arm mount up an inch as well. lots of dam drilling. I hate drilling.

edit// should center up the tire in the wheel well too eh?
m-unit is offline   Reply With Quote
Old 02-05-2013, 01:36 AM   #8
Steve83
Registered User
 
Steve83's Avatar
 
Join Date: Jul 2003
Location: Memphis, TN
Posts: 36,174
iTrader: (101)
Bronco Info: '83 VIN & title on '93 frame/body w/'95 4.9L & EB paint
Quote:
Originally Posted by BRONCONUT View Post
Here is a pic of a good shackle angle
Yeah, the gas tank angle looks just about right, too.
Quote:
Originally Posted by m-unit View Post
should center up the tire in the wheel well too eh?
BEFORE you start cutting & drilling in your frame, try aligning the BODY to the frame first. Loosen all 10 body bolts and use a hydraulic jack to get it centered across the frame, and fore-aft onto each bolt hole. Then retorque all 10 to spec. That might be all it takes to get the wheels centered in the arches.

__________________
Walk softly & carry a BIG SIX ! ! !

. .
Steve83 is offline   Reply With Quote
Old 02-05-2013, 09:43 PM   #9
m-unit
Registered User
 
Join Date: Jan 2008
Location: Southern Ca
Posts: 181
iTrader: (1)
Bronco Info: 1990 5.8 e4OD, 2wd, 5in" lift, 33's
steve I was under the impression that it's not the body, but the rear that gets shifted forward because of the shackle flip.
m-unit is offline   Reply With Quote
Old 02-06-2013, 12:20 AM   #10
Steve83
Registered User
 
Steve83's Avatar
 
Join Date: Jul 2003
Location: Memphis, TN
Posts: 36,174
iTrader: (101)
Bronco Info: '83 VIN & title on '93 frame/body w/'95 4.9L & EB paint
Regardless - CHECK the body position before attempting to adjust the axle to match the (possibly displaced) body.
__________________
Walk softly & carry a BIG SIX ! ! !

. .
Steve83 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  FSB Forums > Bronco Discussions > Noobie Bronco Tech Questions. Flame free zone!


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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
Forum Jump


All times are GMT -4. The time now is 11:42 AM.


2003-2009 FullSizeBronco.com. All rights reserved