The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Suspension

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-13-2016, 11:36 AM   #201
ranger2339
Registered User
 
ranger2339's Avatar
 
Join Date: May 2010
Location: Stillwater,MN
Posts: 39
Re: My caster mod (with pictures)

Quote:
Originally Posted by jjzepplin View Post
Just trying to save a life here. Sorry I was dramatic. I meant no harm. Just doesn't look safe. If you moved the arm forward by the mod method, and then moved the ball joint mounting then didn't you basically just move the place where the spring sits? I just don't follow what you've done here. I am a little slow today. Again, I mean no harm just trying to figure this out. As I understand the MOD it moves the whole arm and that is what it is intended to do. Or did you move the ball joint in the same direction creating even more caster?
Yea no worries, I didn't mod the cross shaft, just the ball joint mounting location so the spring pocket stays the same.


Quote:
Originally Posted by tinydb84 View Post
I did my first set of arms in a similar way.

The plating is more important on the sides than top and bottom. You lost the strength of the arms when you cut through the sides. Think of bending a ruler when it is flat vs standing on its side.
I totally missed that you shortened the arm a bit in order to keep it alignment with one of the sides there, ah damn. Any pics of the final outcome of your arms?

Might just do the cross shaft mod on another set of arms if I messed these up too much.


I do appreciate all the feedback, as Im not the best at this.
ranger2339 is offline   Reply With Quote
Old 10-13-2016, 12:05 PM   #202
tinydb84
Registered User
 
tinydb84's Avatar
 
Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,590
Re: My caster mod (with pictures)

I dont have any pics of them done. You could easily weld a piece of steel to connect the sides.

Here is a pic of how I did a second set
__________________
David
Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991
My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985
Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557
Instagram: myfabguy
tinydb84 is offline   Reply With Quote
Old 10-13-2016, 12:30 PM   #203
crakarjax
Registered User
 
crakarjax's Avatar
 
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,238
Re: My caster mod (with pictures)

Quote:
Originally Posted by tinydb84 View Post
I dont have any pics of them done. You could easily weld a piece of steel to connect the sides.

Here is a pic of how I did a second set
You've got that album set to private
__________________
1968 LWB C20 / AC / Wood Bed
crakarjax is offline   Reply With Quote
Old 10-13-2016, 02:15 PM   #204
ranger2339
Registered User
 
ranger2339's Avatar
 
Join Date: May 2010
Location: Stillwater,MN
Posts: 39
Re: My caster mod (with pictures)

I will probably do my next set like that, just tight on funds and wanted to take a stab at it with the resources I had. Will be a long winter so I have time.

Still would have to figure out the other side with some bracing.


ranger2339 is offline   Reply With Quote
Old 10-13-2016, 03:47 PM   #205
crakarjax
Registered User
 
crakarjax's Avatar
 
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,238
Re: My caster mod (with pictures)

It'll be really hard to get your camber right unless you also take in the upper arm, and then you'll need to think about wheel backspacing (which you'd already have to do anyway most likely.
__________________
1968 LWB C20 / AC / Wood Bed
crakarjax is offline   Reply With Quote
Old 10-13-2016, 04:38 PM   #206
ranger2339
Registered User
 
ranger2339's Avatar
 
Join Date: May 2010
Location: Stillwater,MN
Posts: 39
Re: My caster mod (with pictures)

Yea I did not shorten the arm much so camber should be ok. Just made some relief cuts and bent the arms u bend side supports in and welded them up. In the end should work, seems strong, but will probably be doing the BJ cup replacement mod as it seems the strongest and leaves the spring pocket and integrity of the arm in place?!

Sorry to hijack the thread, I just value the opinions here. I'm done now.



ranger2339 is offline   Reply With Quote
Old 10-13-2016, 04:49 PM   #207
tinydb84
Registered User
 
tinydb84's Avatar
 
Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,590
Re: My caster mod (with pictures)

I don't have my album set to private. Im not logged in and can see the pics. Maybe photobucket was down for a bit.

Anyway. The relief cut should work. I put ball joint cuts in my first set of arms and welded a tab to the airbag cup. Probably overkill.

I shortened the lowers 7/8'' and the uppers 1/2''. Camber was fine with one shim. I know it would reduce camber gain but I was more concerned with fender clearance.
__________________
David
Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991
My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985
Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557
Instagram: myfabguy
tinydb84 is offline   Reply With Quote
Old 10-13-2016, 07:00 PM   #208
69gmcc10
Senior Member
 
69gmcc10's Avatar
 
Join Date: May 2011
Location: Missoula, MT
Posts: 913
Re: My caster mod (with pictures)

ranger2339,

No apologies needed this is not high-jacking. You brought a new idea to the table and with some adjustments to your idea we all learned something and that is what we are here for.

I like your modifications especially with the recent adjustments. I would plate both the inside and outside of both the leading side and trailing side with some rosette welds and a good perimeter weld all around. also run a "skid plate across the bottom that strattles the welded joint to prevent any outward deflection of the sides.

Let us know how it ends up!
__________________
69 GMC C10 build thread- http://67-72chevytrucks.com/vboard/s...d.php?t=501676

03 Silverado build thread-http://67-72chevytrucks.com/vboard/s...d.php?t=591582
69gmcc10 is offline   Reply With Quote
Old 07-24-2017, 09:10 PM   #209
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

I thought I would add some additional information to this thread. I went this route on my Burban by obtaining an extra set of used control arms and rebuilding them. By the time I was done I had four used control arm shafts off of three trucks. The measurements I show in the photos below. All of the used ones were 3" plus or minus a 1/16". The two new Moogs (K6147) I used were at 2 15/16". The measurements are from the end of the shaft to the center of the index hole. I did this to avoid the differences in the machined areas for the seals between old and new shafts as previously discussed. (Second photo) After much measuring and double checking I milled a 3/4" index hole (and finished it off with an 5/8 drill bit just in case the rivet was taller than I expected) at 3 3/4" from the end of the shaft.
I haven't got the truck on the alignment rack yet. (Still waiting for a tie rod end). But I will post the spec's when I get them. A couple of things I noticed when doing this. One is as the lower control arm moves forward it changes how the brake hoses flex and I had to tweek the brackets on the cross member to keep the hoses from rubbing when the wheels are hard over. In addition I had to move my sway bar frame mounts forward 3/4" to keep the ends of the factory sway bar from rubbing on the airbags.
The factory index holes measured 11/16" and the Moogs were 23/32". The index rivets were 19/32" in diameter. That means with the replacement shafts there is 1/8" of slop forward and back. As both of my shafts had been knocked back and had damaged the rivets, I had to drill them out and replace them with 1/2" socket head cap screws as the OP did. The old rivet holes had to be drilled out to half inch. As I didn't machine the index holes deep enough I had to grind a 1/16" off the top of the cap screws to keep them from holding the shaft away from the saddles.
Attached Images
     
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 07-26-2017, 09:45 PM   #210
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

Also when doing this modification on a bagged truck you will have an additional shock issue. The shock will contact the brake line bracket or the cross member at full drop. To solve the problem I removed the stock shock mounts and made new ones that hold the shock away from the control arm farther and about an inch closer to the frame. I apologize for the poor photos.
Attached Images
   
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 07-26-2017, 11:34 PM   #211
crakarjax
Registered User
 
crakarjax's Avatar
 
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,238
Re: My caster mod (with pictures)

Thanks for the heads up on that, nice to know what I'll be running into
__________________
1968 LWB C20 / AC / Wood Bed
crakarjax is offline   Reply With Quote
Old 07-26-2017, 11:55 PM   #212
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

You're welcome. I posted some more photos of the shock mount project and a little more information on "The WMB" thread on page 11 (I think its page 11)
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 07-27-2017, 11:36 PM   #213
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

Got a short window on the alignment rack this afternoon so I got a set of initial readings. This is with the shim sets that the PO had installed and I just reused as a base line. My first impression was "Yikes I went too far!". I may have to pull the lower arms and mill a third location if I can't remove some of the caster!!!
Attached Images
 
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 08-18-2017, 01:06 AM   #214
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

After going through it all this is what I came up with. The Burban is bagged so to get the camber where it is I did go with a one inch higher ride height. The biggest driver of this was to reduce the number of shims so now I have full thread contact on the upper control arm bolts. I will drive it this way for a while and see what I decide what to change next.
Attached Images
 
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 11-04-2018, 09:24 PM   #215
Slowguy
Registered User
 
Join Date: Aug 2017
Location: Chicago,il
Posts: 147
Re: My caster mod (with pictures)

Quote:
Originally Posted by crakarjax View Post
I got my bag mocked up, but it looks like it'll have stress in bad places. Then again, I've never run bags. Anyone know if the offset pictured will cause more than a marginal decrease in bag life? I also have no idea what the internal bumpstops on these bags look like. I'm a little worried that they aren't making solid contact as pictured.
I didn’t even know about this mod until reading a build thread on “green Gus” since I have everything apart for my nut and bolt build I figured I had better do this now or I may regret it.

Anyway, you were one of the only ones to mention bags. I too am using air and wondered how well you solved the issue of the crooked bag? Did you just relocate the mount holes in the top bag bracket? I actually cut out the lower indent section of my lca and welded in pockets to the entire bag will now sit in the pocket when completely deflated. This also allows me to run with more air in the bags at a lowered ride height. I’m wondering if this is going to affect or alter my attempt at this modification?
Attached Images
  
Slowguy is offline   Reply With Quote
Old 11-04-2018, 10:10 PM   #216
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

Here is a link to my Burban thread page on my front bag installation. I did have to reposition the bag on the upper plate to get the bag to sit straighter.
You didn't mention what make and model of bags your installing. If your using the SS7 bags I used, your plan with the control arms should work well. I haven't done it yet but I am planning to cut my lower cups down to get a higher pressure at ride height.

http://67-72chevytrucks.com/vboard/s...698377&page=10
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 11-05-2018, 10:22 AM   #217
Slowguy
Registered User
 
Join Date: Aug 2017
Location: Chicago,il
Posts: 147
Re: My caster mod (with pictures)

All I have are the cheap 2600# airbags that came with the truck. I assume they are mostly the same? If not, it's not a big deal for me to change to a different brand right now.
Attached Images
  
Slowguy is offline   Reply With Quote
Old 11-07-2018, 04:54 PM   #218
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

Those bags are what I replaced. They gave me the same ride height but required higher air pressure to do it on my Burban. I can't really give you a good ride comparison between the two as the entire suspension was worn out with the old bags and the new bags are part of the total suspension rebuild. They are also smaller in diameter so you will have more room for misalignments in the top and bottom mounts as the suspension moves.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 11-12-2018, 03:25 PM   #219
crakarjax
Registered User
 
crakarjax's Avatar
 
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,238
Re: My caster mod (with pictures)

Quote:
Originally Posted by Slowguy View Post
I didn’t even know about this mod until reading a build thread on “green Gus” since I have everything apart for my nut and bolt build I figured I had better do this now or I may regret it.

Anyway, you were one of the only ones to mention bags. I too am using air and wondered how well you solved the issue of the crooked bag?
Did you purchase those cups somewhere? I think I'm going to want to cup my LCAs also.

Anyway for posterity here, it's best to keep the bag centered on the LCA to evenly distribute load to the LCA bushings.
__________________
1968 LWB C20 / AC / Wood Bed
crakarjax is offline   Reply With Quote
Old 11-12-2018, 07:06 PM   #220
Slowguy
Registered User
 
Join Date: Aug 2017
Location: Chicago,il
Posts: 147
Re: My caster mod (with pictures)

Quote:
Originally Posted by crakarjax View Post
Did you purchase those cups somewhere? I think I'm going to want to cup my LCAs also.

Anyway for posterity here, it's best to keep the bag centered on the LCA to evenly distribute load to the LCA bushings.
Yeah. It took me a bit to find these just because of the name needed to search for. I kept looking for “cups” and even if you search their website you can’t find them with that search term. It wasn’t until I used “pocket” that I actually found what is was looking for.

I bought them here : http://www.bcfab.com/Front-Drop-Pock...10_p_1263.html

I could have fabbed something myself but I figured for the amount of time saved searching for the correct sized steel, cutting and welding, etc...I’d be better off just spending the money on these. They went in pretty easy and I think I’ll be glad I did it once everything is all back together. It will allow the front to drop quite a bit more.

Last edited by Slowguy; 11-12-2018 at 07:16 PM. Reason: Typo
Slowguy is offline   Reply With Quote
Old 11-12-2018, 10:36 PM   #221
HO455
Registered User
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 4,358
Re: My caster mod (with pictures)

For what it is worth from what I have done on mine I would recommend going with a smaller diameter bag like the 2600 as opposed to the Slam SS7 that I used. It will be easier to set up the bag at ride height so it won't touch the pocket.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F3 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Reply

Bookmarks

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 01:13 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com